Added locker to registry

# Conflicts:
#	eco-core/core-plugin/src/main/kotlin/com/willfp/eco/internal/spigot/integrations/customitems/CustomItemsOraxen.kt

.github/workflows/checkstyle.yml

@@ -1,15 +0,0 @@
-name: Check PR Codestyle
-on: [ pull_request ]
-
-jobs:
-  checkstyle:
-    name: Checkstyle
-    runs-on: ubuntu-latest
-    steps:
-      - uses: actions/checkout@v2
-      - uses: dbelyaev/action-checkstyle@v0.5.1
-        with:
-          github_token: ${{ secrets.github_token }}
-          reporter: github-pr-review
-          level: warning
-          checkstyle_config: ../../config/checkstyle/checkstyle.xml

.github/workflows/publish-release.yml

@@ -28,6 +28,8 @@ jobs:
       - name: Publish artifact
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          MAVEN_USERNAME: ${{ secrets.MAVEN_USERNAME }}
+          MAVEN_PASSWORD: ${{ secrets.MAVEN_PASSWORD }}
 
         # The GITHUB_REF tag comes in the format 'refs/tags/xxx'.
         # So if we split on '/' and take the 3rd value, we can get the release name.

README.md

@@ -31,6 +31,7 @@ eco comes packed with all the tools you need in your plugins:
 - Yaml/JSON/TOML config system
 - Persistent data storage API with Yaml/MySQL/MongoDB support
 - Packet item display system
+- Lightweight event loop based packet API
 - Entity AI API with near-1:1 NMS mappings
 - More events
 - Extension API, essentially plugins for plugins
@@ -52,7 +53,6 @@ eco comes packed with all the tools you need in your plugins:
 - And much more
 
 # For server owners
-- Requires ProtocolLib to be installed: get the latest version [here](https://www.spigotmc.org/resources/protocollib.1997/)
 - Supports 1.17+
 
 ## Downloads
@@ -63,7 +63,7 @@ eco comes packed with all the tools you need in your plugins:
 # For developers
 
 ## Javadoc
-The 6.49.0 Javadoc can be found [here](https://javadoc.jitpack.io/com/willfp/eco/6.49.0/javadoc/)
+The 6.53.0 Javadoc can be found [here](https://javadoc.jitpack.io/com/willfp/eco/6.53.0/javadoc/)
 
 ## Plugin Information
 
@@ -75,31 +75,31 @@ depend:
   - eco
 ```
 
-## Get from JitPack:
+## Dependency Information:
 
 Gradle:
 
-```groovy
+```kts
 repositories {
-        maven { url 'https://jitpack.io' }
+        maven("https://repo.auxilor.io/repository/maven-public/")
 }
 
 ```
 
 ```groovy
 dependencies {
-        compileOnly 'com.willfp:eco:Tag'
+        compileOnly("com.willfp:eco:Tag")
 }
 ```
 
-Replace `Tag` with a release tag for eco, eg `6.49.0`.
+Replace `Tag` with a release tag for eco, eg `6.53.0`.
 
 Maven:
 
 ```xml
 <repository>
-        <id>jitpack.io</id>
+        <id>auxilor</id>
-        <url>https://jitpack.io</url>
+        <url>https://repo.auxilor.io/repository/maven-public/</url>
 </repository>
 ```
 
@@ -112,7 +112,7 @@ Maven:
 </dependency>
 ```
 
-Replace `Tag` with a release tag for eco, eg `6.49.0`.
+Replace `Tag` with a release tag for eco, eg `6.53.0`.
 
 ## Build locally:
 

build.gradle.kts

@@ -26,6 +26,7 @@ dependencies {
     implementation(project(path = ":eco-core:core-nms:v1_18_R2", configuration = "reobf"))
     implementation(project(path = ":eco-core:core-nms:v1_19_R1", configuration = "reobf"))
     implementation(project(path = ":eco-core:core-nms:v1_19_R2", configuration = "reobf"))
+    implementation(project(path = ":eco-core:core-nms:v1_19_R3", configuration = "reobf"))
 }
 
 allprojects {
@@ -56,7 +57,7 @@ allprojects {
         maven("https://repo.extendedclip.com/content/repositories/placeholderapi/")
 
         // ProtocolLib
-        maven("https://repo.dmulloy2.net/nexus/repository/public/")
+        //maven("https://repo.dmulloy2.net/nexus/repository/public/")
 
         // WorldGuard
         maven("https://maven.enginehub.org/repo/")
@@ -79,6 +80,7 @@ allprojects {
         // LibsDisguises
         maven("https://repo.md-5.net/content/groups/public/")
 
+        // UltraEconomy
         maven("https://repo.techscode.com/repository/maven-releases/")
     }
 

eco-api/build.gradle

@@ -1,38 +0,0 @@
-dependencies {
-    // Adventure
-    compileOnly 'net.kyori:adventure-platform-bukkit:4.1.0'
-
-    // Other
-    compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'
-    compileOnly 'com.comphenix.protocol:ProtocolLib:4.6.1-SNAPSHOT'
-    compileOnly 'com.google.code.gson:gson:2.8.8'
-}
-
-group 'com.willfp'
-version rootProject.version
-
-java {
-    withJavadocJar()
-}
-
-build.dependsOn publishToMavenLocal
-
-publishing {
-    publications {
-        shadow(MavenPublication) {
-            from components.java
-            artifactId 'eco'
-        }
-    }
-
-    repositories {
-        maven {
-            name = "GitHubPackages"
-            url = uri("https://maven.pkg.github.com/Auxilor/eco")
-            credentials {
-                username = System.getenv("GITHUB_ACTOR")
-                password = System.getenv("GITHUB_TOKEN")
-            }
-        }
-    }
-}

eco-api/build.gradle.kts

@@ -0,0 +1,55 @@
+dependencies {
+    // Adventure
+    compileOnly("net.kyori:adventure-platform-bukkit:4.1.0")
+
+    // Other
+    compileOnly("org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT")
+    compileOnly("com.comphenix.protocol:ProtocolLib:4.6.1-SNAPSHOT")
+    compileOnly("com.google.code.gson:gson:2.8.8")
+}
+
+group = "com.willfp"
+version = rootProject.version
+
+java {
+    withJavadocJar()
+}
+
+tasks {
+    build {
+        dependsOn(publishToMavenLocal)
+    }
+}
+
+publishing {
+    publications {
+        create<MavenPublication>("shadow") {
+            from(components["java"])
+            artifactId = "eco"
+        }
+    }
+
+    repositories {
+        maven {
+            name = "GitHubPackages"
+            url = uri("https://maven.pkg.github.com/Auxilor/eco")
+            credentials {
+                username = System.getenv("GITHUB_ACTOR")
+                password = System.getenv("GITHUB_TOKEN")
+            }
+        }
+    }
+
+    publishing {
+        repositories {
+            maven {
+                name = "Auxilor"
+                url = uri("https://repo.auxilor.io/repository/maven-releases/")
+                credentials {
+                    username = System.getenv("MAVEN_USERNAME")
+                    password = System.getenv("MAVEN_PASSWORD")
+                }
+            }
+        }
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/AbstractPacketAdapter.java

@@ -13,27 +13,30 @@ import java.util.Collections;
 
 /**
  * Wrapper class for ProtocolLib packets.
+ *
+ * @deprecated ProtocolLib is no longer used by eco. Use {@link com.willfp.eco.core.packet.PacketListener} instead.
  */
+@Deprecated(since = "6.51.0")
 public abstract class AbstractPacketAdapter extends PacketAdapter {
     /**
-     * The packet type to listen for.
+     * The handle type to listen for.
      */
     private final PacketType type;
 
     /**
-     * Whether the packet adapter should be registered after the server has loaded.
+     * Whether the handle adapter should be registered after the server has loaded.
      * <p>
      * Useful for monitor priority adapters that <b>must</b> be ran last.
      */
     private final boolean postLoad;
 
     /**
-     * Create a new packet adapter for a specified plugin and type.
+     * Create a new handle adapter for a specified plugin and type.
      *
      * @param plugin   The plugin that ProtocolLib should mark as the owner.
      * @param type     The {@link PacketType} to listen for.
-     * @param priority The priority at which the adapter should be ran on packet send/receive.
+     * @param priority The priority at which the adapter should be ran on handle send/receive.
-     * @param postLoad If the packet adapter should be registered after the server has loaded.
+     * @param postLoad If the handle adapter should be registered after the server has loaded.
      */
     protected AbstractPacketAdapter(@NotNull final EcoPlugin plugin,
                                     @NotNull final PacketType type,
@@ -45,11 +48,11 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
     }
 
     /**
-     * Create a new packet adapter for a specified plugin and type.
+     * Create a new handle adapter for a specified plugin and type.
      *
      * @param plugin   The plugin that ProtocolLib should mark as the owner.
      * @param type     The {@link PacketType} to listen for.
-     * @param postLoad If the packet adapter should be registered after the server has loaded.
+     * @param postLoad If the handle adapter should be registered after the server has loaded.
      */
     protected AbstractPacketAdapter(@NotNull final EcoPlugin plugin,
                                     @NotNull final PacketType type,
@@ -58,9 +61,9 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
     }
 
     /**
-     * The code that should be executed once the packet has been received.
+     * The code that should be executed once the handle has been received.
      *
-     * @param packet The packet.
+     * @param packet The handle.
      * @param player The player.
      * @param event  The event.
      */
@@ -71,9 +74,9 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
     }
 
     /**
-     * THe code that should be executed once the packet has been sent.
+     * THe code that should be executed once the handle has been sent.
      *
-     * @param packet The packet.
+     * @param packet The handle.
      * @param player The player.
      * @param event  The event.
      */
@@ -84,7 +87,7 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
     }
 
     /**
-     * Boilerplate to assert that the packet is of the specified type.
+     * Boilerplate to assert that the handle is of the specified type.
      *
      * @param event The ProtocolLib event.
      */
@@ -102,7 +105,7 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
     }
 
     /**
-     * Boilerplate to assert that the packet is of the specified type.
+     * Boilerplate to assert that the handle is of the specified type.
      *
      * @param event The ProtocolLib event.
      */
@@ -125,7 +128,7 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
     }
 
     /**
-     * Register the packet adapter with ProtocolLib.
+     * Register the handle adapter with ProtocolLib.
      */
     public final void register() {
         if (!ProtocolLibrary.getProtocolManager().getPacketListeners().contains(this)) {
@@ -134,7 +137,7 @@ public abstract class AbstractPacketAdapter extends PacketAdapter {
     }
 
     /**
-     * Get if the packet adapter should be loaded last.
+     * Get if the handle adapter should be loaded last.
      *
      * @return If post load.
      */

eco-api/src/main/java/com/willfp/eco/core/Eco.java

@@ -26,13 +26,13 @@ import com.willfp.eco.core.gui.slot.SlotBuilder;
 import com.willfp.eco.core.gui.slot.functional.SlotProvider;
 import com.willfp.eco.core.items.TestableItem;
 import com.willfp.eco.core.math.MathContext;
+import com.willfp.eco.core.packet.Packet;
 import com.willfp.eco.core.proxy.ProxyFactory;
 import com.willfp.eco.core.scheduling.Scheduler;
 import net.kyori.adventure.platform.bukkit.BukkitAudiences;
 import org.apache.commons.lang.Validate;
 import org.bukkit.Location;
 import org.bukkit.NamespacedKey;
-import org.bukkit.command.CommandMap;
 import org.bukkit.configuration.ConfigurationSection;
 import org.bukkit.entity.Entity;
 import org.bukkit.entity.Mob;
@@ -547,19 +547,21 @@ public interface Eco {
      */
     void syncCommands();
 
-    /**
-     * Get the command map.
-     *
-     * @return The command map.
-     */
-    @NotNull CommandMap getCommandMap();
-
     /**
      * Unregister a command.
      *
      * @param command The command.
      */
-    void unregisterCommand(@NotNull final PluginCommand command);
+    void unregisterCommand(@NotNull PluginCommandBase command);
+
+    /**
+     * Send a packet.
+     *
+     * @param player The player.
+     * @param packet The packet.
+     */
+    void sendPacket(@NotNull Player player,
+                    @NotNull Packet packet);
 
     /**
      * Get the instance of eco; the bridge between the api frontend and the implementation backend.

eco-api/src/main/java/com/willfp/eco/core/EcoPlugin.java

@@ -13,11 +13,16 @@ import com.willfp.eco.core.factory.MetadataValueFactory;
 import com.willfp.eco.core.factory.NamespacedKeyFactory;
 import com.willfp.eco.core.factory.RunnableFactory;
 import com.willfp.eco.core.integrations.IntegrationLoader;
+import com.willfp.eco.core.map.ListMap;
+import com.willfp.eco.core.packet.PacketListener;
 import com.willfp.eco.core.proxy.ProxyFactory;
+import com.willfp.eco.core.registry.Registrable;
+import com.willfp.eco.core.registry.Registry;
 import com.willfp.eco.core.scheduling.Scheduler;
+import com.willfp.eco.core.version.OutdatedEcoVersionError;
+import com.willfp.eco.core.version.Version;
 import com.willfp.eco.core.web.UpdateChecker;
 import org.apache.commons.lang.Validate;
-import org.apache.maven.artifact.versioning.DefaultArtifactVersion;
 import org.bukkit.Bukkit;
 import org.bukkit.NamespacedKey;
 import org.bukkit.configuration.file.FileConfiguration;
@@ -34,6 +39,7 @@ import java.util.HashSet;
 import java.util.List;
 import java.util.Objects;
 import java.util.Set;
+import java.util.logging.Level;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
 
@@ -52,27 +58,12 @@ import java.util.stream.Collectors;
  * <b>IMPORTANT: When reloading a plugin, all runnables / tasks will
  * be cancelled.</b>
  */
-@SuppressWarnings("unused")
+@SuppressWarnings({"unused", "DeprecatedIsStillUsed", "deprecation", "RedundantSuppression", "MismatchedQueryAndUpdateOfCollection"})
-public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
+public abstract class EcoPlugin extends JavaPlugin implements PluginLike, Registrable {
     /**
-     * The polymart resource ID of the plugin.
+     * The properties (eco.yml).
      */
-    private final int resourceId;
+    private final PluginProps props;
-
-    /**
-     * The bStats resource ID of the plugin.
-     */
-    private final int bStatsId;
-
-    /**
-     * The package where proxy implementations are.
-     */
-    private final String proxyPackage;
-
-    /**
-     * The color of the plugin, used in messages.
-     */
-    private final String color;
 
     /**
      * Loaded integrations.
@@ -141,11 +132,6 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      */
     private boolean outdated = false;
 
-    /**
-     * If the plugin supports extensions.
-     */
-    private final boolean supportingExtensions;
-
     /**
      * The proxy factory.
      */
@@ -155,27 +141,27 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     /**
      * The tasks to run on enable.
      */
-    private final List<Runnable> onEnable = new ArrayList<>();
+    private final ListMap<LifecyclePosition, Runnable> onEnable = new ListMap<>();
 
     /**
      * The tasks to run on disable.
      */
-    private final List<Runnable> onDisable = new ArrayList<>();
+    private final ListMap<LifecyclePosition, Runnable> onDisable = new ListMap<>();
 
     /**
      * The tasks to run on reload.
      */
-    private final List<Runnable> onReload = new ArrayList<>();
+    private final ListMap<LifecyclePosition, Runnable> onReload = new ListMap<>();
 
     /**
      * The tasks to run on load.
      */
-    private final List<Runnable> onLoad = new ArrayList<>();
+    private final ListMap<LifecyclePosition, Runnable> onLoad = new ListMap<>();
 
     /**
      * The tasks to run after load.
      */
-    private final List<Runnable> afterLoad = new ArrayList<>();
+    private final ListMap<LifecyclePosition, Runnable> afterLoad = new ListMap<>();
 
     /**
      * Create a new plugin.
@@ -192,7 +178,9 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * Create a new plugin without proxy support, polymart, or bStats.
      *
      * @param color The color.
+     * @deprecated Use eco.yml instead.
      */
+    @Deprecated(since = "6.53.0", forRemoval = true)
     protected EcoPlugin(@NotNull final String color) {
         this("", color);
     }
@@ -203,7 +191,9 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      *
      * @param proxyPackage The package where proxy implementations are stored.
      * @param color        The color of the plugin (used in messages, using standard formatting)
+     * @deprecated Use eco.yml instead.
      */
+    @Deprecated(since = "6.53.0", forRemoval = true)
     protected EcoPlugin(@NotNull final String proxyPackage,
                         @NotNull final String color) {
         this(0, 0, proxyPackage, color);
@@ -215,7 +205,9 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param resourceId The polymart resource ID for the plugin.
      * @param bStatsId   The bStats resource ID for the plugin.
      * @param color      The color of the plugin (used in messages, using standard formatting)
+     * @deprecated Use eco.yml instead.
      */
+    @Deprecated(since = "6.53.0", forRemoval = true)
     protected EcoPlugin(final int resourceId,
                         final int bStatsId,
                         @NotNull final String color) {
@@ -229,7 +221,9 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param bStatsId             The bStats resource ID for the plugin.
      * @param color                The color of the plugin (used in messages, using standard formatting)
      * @param supportingExtensions If the plugin supports extensions.
+     * @deprecated Use eco.yml instead.
      */
+    @Deprecated(since = "6.53.0", forRemoval = true)
     protected EcoPlugin(final int resourceId,
                         final int bStatsId,
                         @NotNull final String color,
@@ -244,7 +238,9 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param bStatsId     The bStats resource ID for the plugin.
      * @param proxyPackage The package where proxy implementations are stored.
      * @param color        The color of the plugin (used in messages, using standard formatting)
+     * @deprecated Use eco.yml instead.
      */
+    @Deprecated(since = "6.53.0", forRemoval = true)
     protected EcoPlugin(final int resourceId,
                         final int bStatsId,
                         @NotNull final String proxyPackage,
@@ -260,21 +256,15 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param proxyPackage         The package where proxy implementations are stored.
      * @param color                The color of the plugin (used in messages, using standard formatting)
      * @param supportingExtensions If the plugin supports extensions.
+     * @deprecated Use eco.yml instead.
      */
+    @Deprecated(since = "6.53.0", forRemoval = true)
     protected EcoPlugin(final int resourceId,
                         final int bStatsId,
                         @NotNull final String proxyPackage,
                         @NotNull final String color,
                         final boolean supportingExtensions) {
-        this(
+        this(PluginProps.createSimple(resourceId, bStatsId, proxyPackage, color, supportingExtensions));
-                PluginProps.createSimple(
-                        resourceId,
-                        bStatsId,
-                        proxyPackage,
-                        color,
-                        supportingExtensions
-                )
-        );
     }
 
     /**
@@ -324,13 +314,9 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
         PluginProps props = this.mutateProps(generatedProps);
         props.validate();
 
-        this.resourceId = props.getResourceId();
+        this.props = props;
-        this.bStatsId = props.getBStatsId();
-        this.proxyPackage = props.getProxyPackage();
-        this.color = props.getColor();
-        this.supportingExtensions = props.isSupportingExtensions();
 
-        this.proxyFactory = this.proxyPackage.equalsIgnoreCase("") ? null : Eco.get().createProxyFactory(this);
+        this.proxyFactory = this.props.getProxyPackage().equalsIgnoreCase("") ? null : Eco.get().createProxyFactory(this);
         this.logger = Eco.get().createLogger(this);
 
         this.getLogger().info("Initializing " + this.getColor() + this.getName());
@@ -362,14 +348,14 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
         they have an outdated version of eco installed.
          */
 
-        DefaultArtifactVersion runningVersion = new DefaultArtifactVersion(Eco.get().getEcoPlugin().getDescription().getVersion());
+        Version runningVersion = new Version(Eco.get().getEcoPlugin().getDescription().getVersion());
-        DefaultArtifactVersion requiredVersion = new DefaultArtifactVersion(this.getMinimumEcoVersion());
+        Version requiredVersion = new Version(this.getMinimumEcoVersion());
         if (!(runningVersion.compareTo(requiredVersion) > 0 || runningVersion.equals(requiredVersion))) {
             this.getLogger().severe("You are running an outdated version of eco!");
             this.getLogger().severe("You must be on at least" + this.getMinimumEcoVersion());
             this.getLogger().severe("Download the newest version here:");
             this.getLogger().severe("https://polymart.org/download/773/recent/JSpprMspkuyecf5y1wQ2Jn8OoLQSQ_IW");
-            Bukkit.getPluginManager().disablePlugin(this);
+            throw new OutdatedEcoVersionError("This plugin requires at least eco version " + this.getMinimumEcoVersion() + " to run.");
         }
     }
 
@@ -385,8 +371,8 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
 
         if (this.getResourceId() != 0 && !Eco.get().getEcoPlugin().getConfigYml().getBool("no-update-checker")) {
             new UpdateChecker(this).getVersion(version -> {
-                DefaultArtifactVersion currentVersion = new DefaultArtifactVersion(this.getDescription().getVersion());
+                Version currentVersion = new Version(this.getDescription().getVersion());
-                DefaultArtifactVersion mostRecentVersion = new DefaultArtifactVersion(version);
+                Version mostRecentVersion = new Version(version);
                 if (!(currentVersion.compareTo(mostRecentVersion) > 0 || currentVersion.equals(mostRecentVersion))) {
                     this.outdated = true;
                     this.getLogger().warning(this.getName() + " is out of date! (Version " + this.getDescription().getVersion() + ")");
@@ -400,10 +386,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
             Eco.get().registerBStats(this);
         }
 
-        Set<String> enabledPlugins = Arrays.stream(Bukkit.getPluginManager().getPlugins())
+        Set<String> enabledPlugins = Arrays.stream(Bukkit.getPluginManager().getPlugins()).map(Plugin::getName).map(String::toLowerCase).collect(Collectors.toSet());
-                .map(Plugin::getName)
-                .map(String::toLowerCase)
-                .collect(Collectors.toSet());
 
         if (enabledPlugins.contains("PlaceholderAPI".toLowerCase())) {
             Eco.get().createPAPIIntegration(this);
@@ -411,8 +394,13 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
 
         this.loadIntegrationLoaders().forEach(integrationLoader -> {
             if (enabledPlugins.contains(integrationLoader.getPluginName().toLowerCase())) {
-                this.loadedIntegrations.add(integrationLoader.getPluginName());
+                try {
                     integrationLoader.load();
+                    this.loadedIntegrations.add(integrationLoader.getPluginName());
+                } catch (Exception e) {
+                    this.getLogger().warning("Failed to load integration for " + integrationLoader.getPluginName());
+                    e.printStackTrace();
+                }
             }
         });
 
@@ -422,13 +410,16 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
 
         Prerequisite.update();
 
+        if (Prerequisite.HAS_PROTOCOLLIB.isMet()) {
             this.loadPacketAdapters().forEach(abstractPacketAdapter -> {
                 if (!abstractPacketAdapter.isPostLoad()) {
                     abstractPacketAdapter.register();
                 }
             });
+        }
 
         this.loadListeners().forEach(listener -> this.getEventManager().registerListener(listener));
+        this.loadPacketListeners().forEach(listener -> this.getEventManager().registerPacketListener(listener));
 
         this.loadPluginCommands().forEach(PluginCommand::register);
 
@@ -445,8 +436,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
             }
         }
 
-        this.handleEnable();
+        this.handleLifecycle(this.onEnable, this::handleEnable);
-        this.onEnable.forEach(Runnable::run);
 
         this.getLogger().info("");
     }
@@ -457,7 +447,18 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param task The task.
      */
     public final void onEnable(@NotNull final Runnable task) {
-        this.onEnable.add(task);
+        this.onEnable(LifecyclePosition.END, task);
+    }
+
+    /**
+     * Add new task to run on enable.
+     *
+     * @param position The position to run the task.
+     * @param task     The task.
+     */
+    public final void onEnable(@NotNull final LifecyclePosition position,
+                               @NotNull final Runnable task) {
+        this.onEnable.append(position, task);
     }
 
     /**
@@ -470,8 +471,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
         this.getEventManager().unregisterAllListeners();
         this.getScheduler().cancelAll();
 
-        this.handleDisable();
+        this.handleLifecycle(this.onDisable, this::handleDisable);
-        this.onDisable.forEach(Runnable::run);
 
         if (this.isSupportingExtensions()) {
             this.getExtensionLoader().unloadExtensions();
@@ -487,7 +487,18 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param task The task.
      */
     public final void onDisable(@NotNull final Runnable task) {
-        this.onDisable.add(task);
+        this.onDisable(LifecyclePosition.END, task);
+    }
+
+    /**
+     * Add new task to run on disable.
+     *
+     * @param position The position to run the task.
+     * @param task     The task.
+     */
+    public final void onDisable(@NotNull final LifecyclePosition position,
+                                @NotNull final Runnable task) {
+        this.onDisable.append(position, task);
     }
 
     /**
@@ -497,8 +508,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     public final void onLoad() {
         super.onLoad();
 
-        this.handleLoad();
+        this.handleLifecycle(this.onLoad, this::handleLoad);
-        this.onLoad.forEach(Runnable::run);
     }
 
     /**
@@ -507,7 +517,18 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param task The task.
      */
     public final void onLoad(@NotNull final Runnable task) {
-        this.onLoad.add(task);
+        this.onLoad(LifecyclePosition.END, task);
+    }
+
+    /**
+     * Add new task to run on load.
+     *
+     * @param position The position to run the task.
+     * @param task     The task.
+     */
+    public final void onLoad(@NotNull final LifecyclePosition position,
+                             @NotNull final Runnable task) {
+        this.onLoad.append(position, task);
     }
 
     /**
@@ -520,11 +541,13 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
             Display.registerDisplayModule(this.getDisplayModule());
         }
 
+        if (Prerequisite.HAS_PROTOCOLLIB.isMet()) {
             this.loadPacketAdapters().forEach(abstractPacketAdapter -> {
                 if (abstractPacketAdapter.isPostLoad()) {
                     abstractPacketAdapter.register();
                 }
             });
+        }
 
         if (!Prerequisite.HAS_PAPER.isMet()) {
             this.getLogger().severe("");
@@ -539,8 +562,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
             this.getLogger().severe("");
         }
 
-        this.handleAfterLoad();
+        this.handleLifecycle(this.afterLoad, this::handleAfterLoad);
-        this.afterLoad.forEach(Runnable::run);
 
         this.reload();
 
@@ -548,7 +570,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
             extension.handleAfterLoad();
         }
 
-        this.getLogger().info("Loaded " + this.color + this.getName());
+        this.getLogger().info("Loaded " + this.props.getColor() + this.getName());
     }
 
     /**
@@ -557,7 +579,18 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param task The task.
      */
     public final void afterLoad(@NotNull final Runnable task) {
-        this.afterLoad.add(task);
+        this.afterLoad(LifecyclePosition.END, task);
+    }
+
+    /**
+     * Add new task to run after load.
+     *
+     * @param position The position to run the task.
+     * @param task     The task.
+     */
+    public final void afterLoad(@NotNull final LifecyclePosition position,
+                                @NotNull final Runnable task) {
+        this.afterLoad.append(position, task);
     }
 
     /**
@@ -570,8 +603,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
         this.getConfigHandler().callUpdate();
         this.getConfigHandler().callUpdate(); // Call twice to fix issues
 
-        this.handleReload();
+        this.handleLifecycle(this.onReload, this::handleReload);
-        this.onReload.forEach(Runnable::run);
 
         for (Extension extension : this.extensionLoader.getLoadedExtensions()) {
             extension.handleReload();
@@ -579,12 +611,23 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     }
 
     /**
-     * Add new task to run on enable.
+     * Add new task to run on reload.
      *
      * @param task The task.
      */
     public final void onReload(@NotNull final Runnable task) {
-        this.onReload.add(task);
+        this.onReload(LifecyclePosition.END, task);
+    }
+
+    /**
+     * Add new task to run on reload.
+     *
+     * @param position The position to run the task.
+     * @param task     The task.
+     */
+    public final void onReload(@NotNull final LifecyclePosition position,
+                               @NotNull final Runnable task) {
+        this.onReload.append(position, task);
     }
 
     /**
@@ -600,6 +643,43 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
         return System.currentTimeMillis() - startTime;
     }
 
+    /**
+     * Handle lifecycle.
+     *
+     * @param tasks   The tasks.
+     * @param handler The handler.
+     */
+    private void handleLifecycle(@NotNull final ListMap<LifecyclePosition, Runnable> tasks,
+                                 @NotNull final Runnable handler) {
+        for (Runnable task : tasks.get(LifecyclePosition.START)) {
+            try {
+                task.run();
+            } catch (final Exception e) {
+                this.getLogger().log(Level.SEVERE, "Error while running lifecycle task!");
+                this.getLogger().log(Level.SEVERE, "The plugin may not function properly");
+                e.printStackTrace();
+            }
+        }
+
+        try {
+            handler.run();
+        } catch (final Exception e) {
+            this.getLogger().log(Level.SEVERE, "Error while running lifecycle task!");
+            this.getLogger().log(Level.SEVERE, "The plugin may not function properly");
+            e.printStackTrace();
+        }
+
+        for (Runnable task : tasks.get(LifecyclePosition.END)) {
+            try {
+                task.run();
+            } catch (final Exception e) {
+                this.getLogger().log(Level.SEVERE, "Error while running lifecycle task!");
+                this.getLogger().log(Level.SEVERE, "The plugin may not function properly");
+                e.printStackTrace();
+            }
+        }
+    }
+
     /**
      * The plugin-specific code to be executed on enable.
      * <p>
@@ -681,22 +761,35 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     }
 
     /**
-     * ProtocolLib packet adapters to be registered.
+     * ProtocolLib handle adapters to be registered.
      * <p>
      * If the plugin does not require ProtocolLib this can be left empty.
      *
-     * @return A list of packet adapters.
+     * @return A list of handle adapters.
+     * @deprecated Use {@link #loadPacketListeners()} instead.
      */
+    @Deprecated(since = "6.51.0")
     protected List<AbstractPacketAdapter> loadPacketAdapters() {
         return new ArrayList<>();
     }
 
+    /**
+     * Packet Listeners to be registered.
+     *
+     * @return A list of handle listeners.
+     */
+    protected List<PacketListener> loadPacketListeners() {
+        return new ArrayList<>();
+    }
+
     /**
      * All listeners to be registered.
      *
      * @return A list of all listeners.
      */
-    protected abstract List<Listener> loadListeners();
+    protected List<Listener> loadListeners() {
+        return new ArrayList<>();
+    }
 
     /**
      * Useful for custom LangYml implementations.
@@ -743,10 +836,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      */
     @Nullable
     protected DisplayModule createDisplayModule() {
-        Validate.isTrue(
+        Validate.isTrue(this.getDisplayModule() == null, "Display module exists!");
-                this.getDisplayModule() == null,
-                "Display module exists!"
-        );
 
         return null;
     }
@@ -845,6 +935,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param pluginName The name.
      * @return The plugin.
      */
+    @Nullable
     public static EcoPlugin getPlugin(@NotNull final String pluginName) {
         return Eco.get().getPluginByName(pluginName);
     }
@@ -854,17 +945,28 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      *
      * @return The set of names.
      */
+    @NotNull
     public static Set<String> getPluginNames() {
         return new HashSet<>(Eco.get().getLoadedPlugins());
     }
 
+    /**
+     * Get the plugin props. (eco.yml).
+     *
+     * @return The props.
+     */
+    @NotNull
+    public PluginProps getProps() {
+        return this.props;
+    }
+
     /**
      * Get the polymart resource ID.
      *
      * @return The resource ID.
      */
     public int getResourceId() {
-        return this.resourceId;
+        return this.getProps().getResourceId();
     }
 
     /**
@@ -873,7 +975,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @return The ID.
      */
     public int getBStatsId() {
-        return this.bStatsId;
+        return this.getProps().getBStatsId();
     }
 
     /**
@@ -882,7 +984,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @return The package where proxies are contained.
      */
     public String getProxyPackage() {
-        return this.proxyPackage;
+        return this.getProps().getProxyPackage();
     }
 
     /**
@@ -891,7 +993,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @return The color.
      */
     public String getColor() {
-        return this.color;
+        return this.getProps().getColor();
     }
 
     /**
@@ -1009,7 +1111,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @return If extensions are supported.
      */
     public boolean isSupportingExtensions() {
-        return this.supportingExtensions;
+        return this.getProps().isSupportingExtensions();
     }
 
     /**
@@ -1043,4 +1145,10 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     public FixedMetadataValue createMetadataValue(@NotNull final Object value) {
         return this.getMetadataValueFactory().create(value);
     }
+
+    @Override
+    @NotNull
+    public final String getID() {
+        return Registry.tryFitPattern(this.getName());
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/LifecyclePosition.java

@@ -0,0 +1,16 @@
+package com.willfp.eco.core;
+
+/**
+ * Marks a position in a lifecycle (e.g. enable, reload, etc).
+ */
+public enum LifecyclePosition {
+    /**
+     * Run at the start of the lifecycle.
+     */
+    START,
+
+    /**
+     * Run at the end of the lifecycle.
+     */
+    END
+}

eco-api/src/main/java/com/willfp/eco/core/PluginDependent.java

@@ -1,44 +0,0 @@
-package com.willfp.eco.core;
-
-import org.jetbrains.annotations.NotNull;
-
-/**
- * Quick DI class to manage passing eco plugins.
- * <p>
- * Basically just a quick bit of laziness if you can't be bothered to add a private field
- * and a protected getter, don't use this in kotlin as you can just specify
- * {@code
- * private val plugin: EcoPlugin
- * }
- * in the constructor.
- *
- * @param <T> The eco plugin type.
- * @deprecated Leaky inheritance, shouldn't exist.
- */
-@Deprecated(since = "6.43.0", forRemoval = true)
-public abstract class PluginDependent<T extends EcoPlugin> {
-    /**
-     * The {@link EcoPlugin} that is stored.
-     */
-    @NotNull
-    private final T plugin;
-
-    /**
-     * Pass an {@link EcoPlugin} in order to interface with it.
-     *
-     * @param plugin The plugin to manage.
-     */
-    protected PluginDependent(@NotNull final T plugin) {
-        this.plugin = plugin;
-    }
-
-    /**
-     * Get the plugin.
-     *
-     * @return The plugin.
-     */
-    @NotNull
-    protected T getPlugin() {
-        return this.plugin;
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/PluginProps.java

@@ -49,6 +49,16 @@ public final class PluginProps {
     @Nullable
     private Boolean supportingExtensions;
 
+    /**
+     * The environment variables.
+     */
+    private final Map<String, String> environment = new HashMap<>();
+
+    /**
+     * If the plugin uses reflective reload (via {@link com.willfp.eco.core.config.updating.ConfigUpdater}).
+     */
+    private boolean usesReflectiveReload = true;
+
     /**
      * Create new blank props.
      */
@@ -153,6 +163,46 @@ public final class PluginProps {
         this.supportingExtensions = supportingExtensions;
     }
 
+    /**
+     * Get an environment variable.
+     *
+     * @param name The name.
+     * @return The value of the variable.
+     */
+    @Nullable
+    public String getEnvironmentVariable(@NotNull final String name) {
+        return environment.get(name);
+    }
+
+    /**
+     * Set an environment variable.
+     *
+     * @param name  The name.
+     * @param value The value.
+     */
+    public void setEnvironmentVariable(@NotNull final String name,
+                                       @NotNull final String value) {
+        environment.put(name, value);
+    }
+
+    /**
+     * Set if the plugin uses reflective reload.
+     *
+     * @return If the plugin uses reflective reload.
+     */
+    public boolean isUsingReflectiveReload() {
+        return usesReflectiveReload;
+    }
+
+    /**
+     * Set if the plugin uses reflective reload.
+     *
+     * @param usesReflectiveReload If the plugin uses reflective reload.
+     */
+    public void setUsesReflectiveReload(final boolean usesReflectiveReload) {
+        this.usesReflectiveReload = usesReflectiveReload;
+    }
+
     /**
      * Ensure that all required props have been set.
      */
@@ -232,7 +282,9 @@ public final class PluginProps {
      * @param color              The primary color of the plugin.
      * @param supportsExtensions If the plugin should attempt to look for extensions.
      * @return The props.
+     * @deprecated Moving to force the usage of eco.yml.
      */
+    @Deprecated(since = "6.53.0")
     static PluginProps createSimple(final int resourceId,
                                     final int bStatsId,
                                     @NotNull final String proxyPackage,

eco-api/src/main/java/com/willfp/eco/core/Prerequisite.java

@@ -1,6 +1,5 @@
 package com.willfp.eco.core;
 
-import com.willfp.eco.core.integrations.economy.EconomyManager;
 import com.willfp.eco.core.proxy.ProxyConstants;
 import com.willfp.eco.util.ClassUtils;
 import org.jetbrains.annotations.NotNull;
@@ -31,14 +30,19 @@ public class Prerequisite {
     );
 
     /**
-     * Requires the server to have vault installed.
+     * Requires the server to be running an implementation of paper.
-     *
-     * @deprecated Use {@link EconomyManager#hasRegistrations()} instead.
      */
-    @Deprecated(forRemoval = true)
+    public static final Prerequisite HAS_PROTOCOLLIB = new Prerequisite(
-    public static final Prerequisite HAS_VAULT = new Prerequisite(
+            () -> ClassUtils.exists("com.comphenix.protocol.events.PacketAdapter"),
-            () -> ClassUtils.exists("net.milkbowl.vault.economy.Economy"),
+            "Requires server to have ProtocolLib"
-            "Requires server to have vault"
+    );
+
+    /**
+     * Requires the server to be running 1.19.4.
+     */
+    public static final Prerequisite HAS_1_19_4 = new Prerequisite(
+            () -> ProxyConstants.NMS_VERSION.contains("19_R3"),
+            "Requires server to be running 1.19.4+"
     );
 
     /**
@@ -57,17 +61,6 @@ public class Prerequisite {
             "Requires server to be running 1.18+"
     );
 
-    /**
-     * Requires the server to be running 1.17.
-     *
-     * @deprecated eco no longer supports versions before 1.17.
-     */
-    @Deprecated(since = "6.25.2", forRemoval = true)
-    public static final Prerequisite HAS_1_17 = new Prerequisite(
-            () -> ProxyConstants.NMS_VERSION.contains("17") || HAS_1_18.isMet(),
-            "Requires server to be running 1.17+"
-    );
-
     /**
      * Requires the server to be running an implementation of BungeeCord.
      *

eco-api/src/main/java/com/willfp/eco/core/command/NotificationException.java

@@ -1,5 +1,7 @@
 package com.willfp.eco.core.command;
 
+import org.jetbrains.annotations.NotNull;
+
 /**
  * A notification exception is thrown when {@link org.bukkit.command.CommandSender}s don't
  * specify valid arguments in commands.
@@ -18,7 +20,7 @@ public class NotificationException extends Exception {
      *
      * @param key The lang key of the notification.
      */
-    public NotificationException(String key) {
+    public NotificationException(@NotNull final String key) {
         super(key);
         this.key = key;
     }

eco-api/src/main/java/com/willfp/eco/core/command/impl/DelegatedBukkitCommand.java

@@ -14,7 +14,7 @@ import java.util.List;
  *
  * @deprecated Internal command implementations have been removed from the API.
  */
-@Deprecated(forRemoval = true, since = "6.49.0")
+@Deprecated(since = "6.49.0", forRemoval = true)
 public final class DelegatedBukkitCommand extends Command implements TabCompleter, PluginIdentifiableCommand {
     /**
      * The delegate command.

eco-api/src/main/java/com/willfp/eco/core/config/ExtendableConfig.java

@@ -16,6 +16,8 @@ import org.jetbrains.annotations.NotNull;
  */
 public abstract class ExtendableConfig extends LoadableConfigWrapper {
     /**
+     * Create a new extendable config.
+     *
      * @param configName       The name of the config
      * @param removeUnused     Whether keys not present in the default config should be removed on update.
      * @param plugin           The plugin.

eco-api/src/main/java/com/willfp/eco/core/config/TransientConfig.java

@@ -26,6 +26,8 @@ import java.util.Map;
 @Deprecated(since = "6.44.0", forRemoval = true)
 public class TransientConfig extends ConfigWrapper<Config> {
     /**
+     * Create new transient config from bukkit config.
+     *
      * @param config The ConfigurationSection handle.
      */
     public TransientConfig(@NotNull final ConfigurationSection config) {
@@ -42,6 +44,8 @@ public class TransientConfig extends ConfigWrapper<Config> {
     }
 
     /**
+     * Create a transient config from an input stream.
+     *
      * @param stream The InputStream.
      */
     public TransientConfig(@Nullable final InputStream stream) {
@@ -51,15 +55,8 @@ public class TransientConfig extends ConfigWrapper<Config> {
     }
 
     /**
-     * @param file The File.
+     * Load a file to a config.
-     * @deprecated Specify the config type to prevent bugs.
+     *
-     */
-    @Deprecated(since = "6.30.0", forRemoval = true)
-    public TransientConfig(@Nullable final File file) {
-        this(file, ConfigType.YAML);
-    }
-
-    /**
      * @param file The file.
      * @param type The config type to try read from.
      */
@@ -97,6 +94,8 @@ public class TransientConfig extends ConfigWrapper<Config> {
     }
 
     /**
+     * Load a config from a string.
+     *
      * @param contents The contents of the config.
      * @param type     The config type.
      */

eco-api/src/main/java/com/willfp/eco/core/config/interfaces/Config.java

@@ -30,16 +30,6 @@ import java.util.Set;
  */
 @SuppressWarnings("unused")
 public interface Config extends Cloneable, PlaceholderInjectable {
-    /**
-     * Clears cache.
-     * <p>
-     * Configs no longer have caches as they have in previous versions.
-     */
-    @Deprecated(since = "6.31.1", forRemoval = true)
-    default void clearCache() {
-        // Do nothing.
-    }
-
     /**
      * Convert the config into readable text.
      *

eco-api/src/main/java/com/willfp/eco/core/config/interfaces/LoadableConfig.java

@@ -2,7 +2,6 @@ package com.willfp.eco.core.config.interfaces;
 
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
 
 import java.io.File;
 import java.io.IOException;
@@ -44,21 +43,6 @@ public interface LoadableConfig extends Config {
      */
     String getName();
 
-    /**
-     * Get bukkit {@link YamlConfiguration}.
-     * <p>
-     * This used to represent the underlying config, but since 6.30.0 configs use
-     * their own implementations internally, without relying on bukkit.
-     *
-     * @return The config, or null if config is not yaml-based.
-     * @deprecated Use toBukkit() instead.
-     */
-    @Nullable
-    @Deprecated(since = "6.30.0", forRemoval = true)
-    default YamlConfiguration getBukkitHandle() {
-        return this.toBukkit();
-    }
-
     /**
      * Convert the config to a bukkit {@link YamlConfiguration}.
      */

eco-api/src/main/java/com/willfp/eco/core/config/updating/ConfigUpdater.java

@@ -38,6 +38,9 @@ import java.lang.annotation.Target;
  * <p>
  * By having a plugin as a parameter, you shouldn't really need getInstance()
  * calls in your code.
+ *
+ * While flexible, this can lead to long initialization times, so this feature
+ * can be disabled in eco.yml with the uses-reflective-reload option.
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target(ElementType.METHOD)

eco-api/src/main/java/com/willfp/eco/core/config/wrapper/ConfigWrapper.java

@@ -19,7 +19,7 @@ import java.util.Set;
  *
  * @param <T> The type of the handle.
  */
-@SuppressWarnings({"MethodDoesntCallSuperMethod", "removal"})
+@SuppressWarnings("MethodDoesntCallSuperMethod")
 public abstract class ConfigWrapper<T extends Config> implements Config {
     /**
      * Configs from eco have an internal implementation,
@@ -42,12 +42,6 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
         this.handle = handle;
     }
 
-    @Override
-    @Deprecated(since = "6.31.1", forRemoval = true)
-    public void clearCache() {
-        handle.clearCache();
-    }
-
     @Override
     public String toPlaintext() {
         return handle.toPlaintext();

eco-api/src/main/java/com/willfp/eco/core/data/ExternalDataStore.java

@@ -0,0 +1,148 @@
+package com.willfp.eco.core.data;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+import java.util.function.Supplier;
+
+/**
+ * A simple store key-value store for data to be stored outside of plugins.
+ */
+@SuppressWarnings("unchecked")
+public final class ExternalDataStore {
+    /**
+     * The store.
+     */
+    private static final Map<String, Object> DATA = new HashMap<>();
+
+    /**
+     * The store adapters.
+     */
+    private static final List<ExternalDataStoreObjectAdapter<?, ?>> STORE_ADAPTERS = new ArrayList<>();
+
+    /**
+     * Put data into the store.
+     *
+     * @param key   The key.
+     * @param value The value.
+     */
+    public static void put(@NotNull final String key,
+                           @NotNull final Object value) {
+        doPut(key, value);
+    }
+
+    /**
+     * Put data into the store.
+     *
+     * @param key   The key.
+     * @param value The value.
+     * @param <A>   The stored type.
+     */
+    private static <A> void doPut(@NotNull final String key,
+                                  @NotNull final A value) {
+        Object storedValue = value;
+
+        for (ExternalDataStoreObjectAdapter<?, ?> unknownAdapter : STORE_ADAPTERS) {
+            if (unknownAdapter.getAccessedClass().isInstance(value)) {
+                ExternalDataStoreObjectAdapter<A, ?> adapter = (ExternalDataStoreObjectAdapter<A, ?>) unknownAdapter;
+                storedValue = adapter.toStoredObject(value);
+                break;
+            }
+        }
+
+        DATA.put(key, storedValue);
+    }
+
+    /**
+     * Get data from the store.
+     *
+     * @param key   The key.
+     * @param clazz The class.
+     * @param <T>   The type.
+     * @return The value.
+     */
+    @Nullable
+    public static <T> T get(@NotNull final String key,
+                            @NotNull final Class<T> clazz) {
+        return doGet(key, clazz);
+    }
+
+    /**
+     * Get data from the store.
+     *
+     * @param key   The key.
+     * @param clazz The class.
+     * @param <A>   The accessed type.
+     * @param <S>   The stored type.
+     * @return The value.
+     */
+    @Nullable
+    private static <A, S> A doGet(@NotNull final String key,
+                                  @NotNull final Class<A> clazz) {
+        Object value = DATA.get(key);
+
+        for (ExternalDataStoreObjectAdapter<?, ?> unknownAdapter : STORE_ADAPTERS) {
+            if (unknownAdapter.getStoredClass().isInstance(value) && unknownAdapter.getAccessedClass().equals(clazz)) {
+                ExternalDataStoreObjectAdapter<A, S> adapter = (ExternalDataStoreObjectAdapter<A, S>) unknownAdapter;
+                value = adapter.toAccessedObject((S) value);
+                break;
+            }
+        }
+
+        if (clazz.isInstance(value)) {
+            return clazz.cast(value);
+        } else {
+            return null;
+        }
+    }
+
+    /**
+     * Get data from the store.
+     *
+     * @param key          The key.
+     * @param clazz        The class.
+     * @param defaultValue The default value.
+     * @param <T>          The type.
+     * @return The value.
+     */
+    @NotNull
+    public static <T> T get(@NotNull final String key,
+                            @NotNull final Class<T> clazz,
+                            @NotNull final T defaultValue) {
+        T value = get(key, clazz);
+        return value == null ? defaultValue : value;
+    }
+
+    /**
+     * Get data from the store.
+     *
+     * @param key          The key.
+     * @param clazz        The class.
+     * @param defaultValue The default value.
+     * @param <T>          The type.
+     * @return The value.
+     */
+    @NotNull
+    public static <T> T get(@NotNull final String key,
+                            @NotNull final Class<T> clazz,
+                            @NotNull final Supplier<T> defaultValue) {
+        return get(key, clazz, defaultValue.get());
+    }
+
+    /**
+     * Register a new adapter.
+     *
+     * @param adapter The adapter.
+     */
+    public static void registerAdapter(@NotNull final ExternalDataStoreObjectAdapter<?, ?> adapter) {
+        STORE_ADAPTERS.add(adapter);
+    }
+
+    private ExternalDataStore() {
+        throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/ExternalDataStoreObjectAdapter.java

@@ -0,0 +1,69 @@
+package com.willfp.eco.core.data;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * An adapter for objects stored in {@link ExternalDataStore}.
+ *
+ * @param <A> The accessed class.
+ * @param <S> The stored class.
+ */
+public abstract class ExternalDataStoreObjectAdapter<A, S> {
+    /**
+     * The class that is accessed (read / written).
+     */
+    private final Class<? extends A> accessedClass;
+
+    /**
+     * The class that is stored internally.
+     */
+    private final Class<? extends S> storedClass;
+
+    /**
+     * Create a new adapter.
+     *
+     * @param accessedClass The class that is accessed (read / written).
+     * @param storedClass   The class that is stored internally.
+     */
+    protected ExternalDataStoreObjectAdapter(@NotNull final Class<? extends A> accessedClass,
+                                             @NotNull final Class<? extends S> storedClass) {
+        this.accessedClass = accessedClass;
+        this.storedClass = storedClass;
+    }
+
+    /**
+     * Convert an object to the stored object.
+     *
+     * @param obj The object.
+     * @return The stored object.
+     */
+    @NotNull
+    public abstract S toStoredObject(@NotNull final A obj);
+
+    /**
+     * Convert an object to the accessed object.
+     *
+     * @param obj The object.
+     * @return The accessed object.
+     */
+    @NotNull
+    public abstract A toAccessedObject(@NotNull final S obj);
+
+    /**
+     * Get the class that is accessed (read / written).
+     *
+     * @return The class.
+     */
+    public Class<? extends A> getAccessedClass() {
+        return accessedClass;
+    }
+
+    /**
+     * Get the class that is stored internally.
+     *
+     * @return The class.
+     */
+    public Class<? extends S> getStoredClass() {
+        return storedClass;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKey.java

@@ -82,44 +82,6 @@ public final class PersistentDataKey<T> {
         return this.type;
     }
 
-    /**
-     * In older eco versions, keys would have to be categorized in order
-     * to register the columns in the MySQL database. This is no longer needed.
-     * <p>
-     * Old description is below:
-     * <p>
-     * Categorize key as a server key, will register new column to MySQL
-     * database immediately rather than waiting for auto-categorization.
-     * <p>
-     * This will improve performance.
-     *
-     * @return The key.
-     * @deprecated Not required since the new MySQL data handler was introduced.
-     */
-    @Deprecated(since = "6.40.0", forRemoval = true)
-    public PersistentDataKey<T> server() {
-        return this;
-    }
-
-    /**
-     * In older eco versions, keys would have to be categorized in order
-     * to register the columns in the MySQL database. This is no longer needed.
-     * <p>
-     * Old description is below:
-     * <p>
-     * Categorize key as a player key, will register new column to MySQL
-     * database immediately rather than waiting for auto-categorization.
-     * <p>
-     * This will improve performance.
-     *
-     * @return The key.
-     * @deprecated Not required since the new MySQL data handler was introduced.
-     */
-    @Deprecated(since = "6.40.0", forRemoval = true)
-    public PersistentDataKey<T> player() {
-        return this;
-    }
-
     /**
      * Get all persistent data keys.
      *

eco-api/src/main/java/com/willfp/eco/core/data/keys/PersistentDataKeyType.java

@@ -22,55 +22,38 @@ public final class PersistentDataKeyType<T> {
     /**
      * String.
      */
-    public static final PersistentDataKeyType<String> STRING = new PersistentDataKeyType<>(String.class, "STRING");
+    public static final PersistentDataKeyType<String> STRING = new PersistentDataKeyType<>("STRING");
 
     /**
      * Boolean.
      */
-    public static final PersistentDataKeyType<Boolean> BOOLEAN = new PersistentDataKeyType<>(Boolean.class, "BOOLEAN");
+    public static final PersistentDataKeyType<Boolean> BOOLEAN = new PersistentDataKeyType<>("BOOLEAN");
 
     /**
      * Int.
      */
-    public static final PersistentDataKeyType<Integer> INT = new PersistentDataKeyType<>(Integer.class, "INT");
+    public static final PersistentDataKeyType<Integer> INT = new PersistentDataKeyType<>("INT");
 
     /**
      * Double.
      */
-    public static final PersistentDataKeyType<Double> DOUBLE = new PersistentDataKeyType<>(Double.class, "DOUBLE");
+    public static final PersistentDataKeyType<Double> DOUBLE = new PersistentDataKeyType<>("DOUBLE");
 
     /**
      * String List.
      */
-    public static final PersistentDataKeyType<List<String>> STRING_LIST = new PersistentDataKeyType<>(null, "STRING_LIST");
+    public static final PersistentDataKeyType<List<String>> STRING_LIST = new PersistentDataKeyType<>("STRING_LIST");
 
     /**
      * Config.
      */
-    public static final PersistentDataKeyType<Config> CONFIG = new PersistentDataKeyType<>(Config.class, "CONFIG");
+    public static final PersistentDataKeyType<Config> CONFIG = new PersistentDataKeyType<>("CONFIG");
-
-    /**
-     * The class of the type.
-     */
-    private final Class<T> typeClass;
 
     /**
      * The name of the key type.
      */
     private final String name;
 
-    /**
-     * Get the class of the type.
-     *
-     * @return The class.
-     * @deprecated String list type will return null.
-     */
-    @Deprecated(since = "6.36.0", forRemoval = true)
-    @Nullable
-    public Class<T> getTypeClass() {
-        return typeClass;
-    }
-
     /**
      * Get the name of the key type.
      *
@@ -83,14 +66,11 @@ public final class PersistentDataKeyType<T> {
     /**
      * Create new PersistentDataKeyType.
      *
-     * @param typeClass The type class.
      * @param name      The name.
      */
-    private PersistentDataKeyType(@Nullable final Class<T> typeClass,
+    private PersistentDataKeyType(@NotNull final String name) {
-                                  @NotNull final String name) {
         VALUES.add(this);
 
-        this.typeClass = typeClass;
         this.name = name;
     }
 

eco-api/src/main/java/com/willfp/eco/core/display/Display.java

@@ -1,6 +1,7 @@
 package com.willfp.eco.core.display;
 
 import com.willfp.eco.core.fast.FastItemStack;
+import com.willfp.eco.core.integrations.guidetection.GUIDetectionManager;
 import com.willfp.eco.util.NamespacedKeyUtils;
 import org.bukkit.NamespacedKey;
 import org.bukkit.entity.Player;
@@ -18,6 +19,9 @@ import java.util.TreeMap;
 
 /**
  * Utility class to manage client-side item display.
+ * <p>
+ * Packet display is not done on the main thread, so make sure
+ * all your modules are thread-safe.
  */
 public final class Display {
     /**
@@ -71,7 +75,7 @@ public final class Display {
         ItemStack original = itemStack.clone();
         Inventory inventory = player == null ? null : player.getOpenInventory().getTopInventory();
         boolean inInventory = inventory != null && inventory.contains(original);
-        boolean inGui = inventory != null && inventory.getHolder() == null;
+        boolean inGui = player != null && GUIDetectionManager.hasGUIOpen(player);
 
         DisplayProperties properties = new DisplayProperties(
                 inInventory,

eco-api/src/main/java/com/willfp/eco/core/display/DisplayModule.java

@@ -8,6 +8,8 @@ import org.jetbrains.annotations.Nullable;
 
 /**
  * Class for all plugin-specific client-side item display modules.
+ * <p>
+ * Display modules are called in the netty thread, so make sure they are thread-safe.
  */
 public abstract class DisplayModule {
     /**
@@ -110,23 +112,6 @@ public abstract class DisplayModule {
         return this.getPlugin().getName();
     }
 
-    /**
-     * Get the display priority.
-     *
-     * @return The priority.
-     * @deprecated Use getWeight instead.
-     */
-    @Deprecated(since = "6.35.0", forRemoval = true)
-    public DisplayPriority getPriority() {
-        return switch (this.weight) {
-            case 100 -> DisplayPriority.LOWEST;
-            case 200 -> DisplayPriority.LOW;
-            case 300 -> DisplayPriority.HIGH;
-            case 400 -> DisplayPriority.HIGHEST;
-            default -> DisplayPriority.CUSTOM;
-        };
-    }
-
     /**
      * Get the display weight.
      *

eco-api/src/main/java/com/willfp/eco/core/display/DisplayPriority.java

@@ -6,7 +6,10 @@ package com.willfp.eco.core.display;
 public enum DisplayPriority {
     /**
      * Custom weight.
+     *
+     * @deprecated Will never be used.
      */
+    @Deprecated(since = "6.53.0", forRemoval = true)
     CUSTOM(250),
 
     /**

eco-api/src/main/java/com/willfp/eco/core/entities/ai/CustomGoal.java

@@ -20,6 +20,13 @@ public abstract class CustomGoal<T extends Mob> implements EntityGoal<T>, Target
      */
     private final Set<GoalFlag> flags = EnumSet.noneOf(GoalFlag.class);
 
+    /**
+     * Create a new custom goal.
+     */
+    protected CustomGoal() {
+
+    }
+
     /**
      * Initialize the goal with a mob.
      * <p>

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalAvoidEntity.java

@@ -45,7 +45,6 @@ public record EntityGoalAvoidEntity(
                 return null;
             }
 
-            try {
             TestableEntity entity = Entities.lookup(config.getString("entity"));
 
             return new EntityGoalAvoidEntity(
@@ -54,14 +53,6 @@ public record EntityGoalAvoidEntity(
                     config.getDouble("slowSpeed"),
                     config.getDouble("fastSpeed")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalBreakDoors.java

@@ -34,18 +34,9 @@ public record EntityGoalBreakDoors(
                 return null;
             }
 
-            try {
             return new EntityGoalBreakDoors(
                     config.getInt("ticks")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalBreed.java

@@ -34,18 +34,9 @@ public record EntityGoalBreed(
                 return null;
             }
 
-            try {
             return new EntityGoalBreed(
                     config.getDouble("speed")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalCatLieOnBed.java

@@ -37,19 +37,10 @@ public record EntityGoalCatLieOnBed(
                 return null;
             }
 
-            try {
             return new EntityGoalCatLieOnBed(
                     config.getDouble("speed"),
                     config.getInt("range")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalCatSitOnBed.java

@@ -34,18 +34,9 @@ public record EntityGoalCatSitOnBed(
                 return null;
             }
 
-            try {
             return new EntityGoalCatSitOnBed(
                     config.getDouble("speed")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalFleeSun.java

@@ -34,18 +34,9 @@ public record EntityGoalFleeSun(
                 return null;
             }
 
-            try {
             return new EntityGoalFleeSun(
                     config.getDouble("speed")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalFollowMobs.java

@@ -40,20 +40,11 @@ public record EntityGoalFollowMobs(
                 return null;
             }
 
-            try {
             return new EntityGoalFollowMobs(
                     config.getDouble("speed"),
                     config.getDouble("minDistance"),
                     config.getDouble("maxDistance")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalInteract.java

@@ -42,20 +42,11 @@ public record EntityGoalInteract(
                 return null;
             }
 
-            try {
             return new EntityGoalInteract(
                     Entities.lookup(config.getString("target")),
                     config.getDouble("range"),
                     config.getDouble("chance")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalLeapAtTarget.java

@@ -34,18 +34,9 @@ public record EntityGoalLeapAtTarget(
                 return null;
             }
 
-            try {
             return new EntityGoalLeapAtTarget(
                     config.getDouble("velocity")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalLookAtPlayer.java

@@ -37,19 +37,10 @@ public record EntityGoalLookAtPlayer(
                 return null;
             }
 
-            try {
             return new EntityGoalLookAtPlayer(
                     config.getDouble("range"),
                     config.getDouble("chance")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMeleeAttack.java

@@ -37,19 +37,10 @@ public record EntityGoalMeleeAttack(
                 return null;
             }
 
-            try {
             return new EntityGoalMeleeAttack(
                     config.getDouble("speed"),
                     config.getBool("pauseWhenMobIdle")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMoveBackToVillage.java

@@ -37,19 +37,10 @@ public record EntityGoalMoveBackToVillage(
                 return null;
             }
 
-            try {
             return new EntityGoalMoveBackToVillage(
                     config.getDouble("speed"),
                     config.getBool("canDespawn")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMoveThroughVillage.java

@@ -43,21 +43,12 @@ public record EntityGoalMoveThroughVillage(
                 return null;
             }
 
-            try {
             return new EntityGoalMoveThroughVillage(
                     config.getDouble("speed"),
                     config.getBool("onlyAtNight"),
                     config.getInt("distance"),
                     config.getBool("canPassThroughDoors")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMoveTowardsRestriction.java

@@ -34,18 +34,9 @@ public record EntityGoalMoveTowardsRestriction(
                 return null;
             }
 
-            try {
             return new EntityGoalMoveTowardsRestriction(
                     config.getDouble("speed")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalMoveTowardsTarget.java

@@ -37,19 +37,10 @@ public record EntityGoalMoveTowardsTarget(
                 return null;
             }
 
-            try {
             return new EntityGoalMoveTowardsTarget(
                     config.getDouble("speed"),
                     config.getDouble("maxDistance")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalOpenDoors.java

@@ -34,18 +34,9 @@ public record EntityGoalOpenDoors(
                 return null;
             }
 
-            try {
             return new EntityGoalOpenDoors(
                     config.getBool("delayClosing")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalPanic.java

@@ -34,18 +34,9 @@ public record EntityGoalPanic(
                 return null;
             }
 
-            try {
             return new EntityGoalPanic(
                     config.getDouble("speed")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalRandomStroll.java

@@ -40,20 +40,11 @@ public record EntityGoalRandomStroll(
                 return null;
             }
 
-            try {
             return new EntityGoalRandomStroll(
                     config.getDouble("speed"),
                     config.getInt("interval"),
                     config.getBool("canDespawn")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalRandomSwimming.java

@@ -37,19 +37,10 @@ public record EntityGoalRandomSwimming(
                 return null;
             }
 
-            try {
             return new EntityGoalRandomSwimming(
                     config.getDouble("speed"),
                     config.getInt("interval")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalRangedAttack.java

@@ -45,21 +45,12 @@ public record EntityGoalRangedAttack(
                 return null;
             }
 
-            try {
             return new EntityGoalRangedAttack(
                     config.getDouble("speed"),
                     config.getInt("minInterval"),
                     config.getInt("maxInterval"),
                     config.getDouble("range")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalRangedBowAttack.java

@@ -42,20 +42,11 @@ public record EntityGoalRangedBowAttack(
                 return null;
             }
 
-            try {
             return new EntityGoalRangedBowAttack(
                     config.getDouble("speed"),
                     config.getInt("interval"),
                     config.getDouble("range")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalRangedCrossbowAttack.java

@@ -39,19 +39,10 @@ public record EntityGoalRangedCrossbowAttack(
                 return null;
             }
 
-            try {
             return new EntityGoalRangedCrossbowAttack(
                     config.getDouble("speed"),
                     config.getDouble("range")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalStrollThroughVillage.java

@@ -34,18 +34,9 @@ public record EntityGoalStrollThroughVillage(
                 return null;
             }
 
-            try {
             return new EntityGoalStrollThroughVillage(
                     config.getInt("searchRange")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalTempt.java

@@ -28,6 +28,8 @@ public record EntityGoalTempt(
         boolean canBeScared
 ) implements EntityGoal<Mob> {
     /**
+     * Create a new entity goal.
+     *
      * @param speed       The speed at which the entity follows the item.
      * @param item        The item that the entity will be attracted by.
      * @param canBeScared If the entity can be scared and lose track of the item.
@@ -58,7 +60,6 @@ public record EntityGoalTempt(
                 return null;
             }
 
-            try {
             Collection<TestableItem> items = config.getStrings("items").stream()
                     .map(Items::lookup)
                     .filter(it -> !(it instanceof EmptyTestableItem))
@@ -69,14 +70,6 @@ public record EntityGoalTempt(
                     items,
                     config.getBool("canBeScared")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalUseItem.java

@@ -48,7 +48,6 @@ public record EntityGoalUseItem(
                 return null;
             }
 
-            try {
             TestableEntity filter = Entities.lookup(config.getString("condition"));
 
             return new EntityGoalUseItem(
@@ -56,14 +55,6 @@ public record EntityGoalUseItem(
                     Sound.valueOf(config.getString("sound").toUpperCase()),
                     filter::matches
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalWaterAvoidingRandomFlying.java

@@ -34,18 +34,9 @@ public record EntityGoalWaterAvoidingRandomFlying(
                 return null;
             }
 
-            try {
             return new EntityGoalWaterAvoidingRandomFlying(
                     config.getDouble("speed")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalWaterAvoidingRandomStroll.java

@@ -37,19 +37,10 @@ public record EntityGoalWaterAvoidingRandomStroll(
                 return null;
             }
 
-            try {
             return new EntityGoalWaterAvoidingRandomStroll(
                     config.getDouble("speed"),
                     config.getDouble("chance")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/entity/EntityGoalWolfBeg.java

@@ -34,18 +34,9 @@ public record EntityGoalWolfBeg(
                 return null;
             }
 
-            try {
             return new EntityGoalWolfBeg(
                     config.getDouble("distance")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/target/TargetGoalHurtBy.java

@@ -37,18 +37,9 @@ public record TargetGoalHurtBy(
                 return null;
             }
 
-            try {
             return new TargetGoalHurtBy(
                     Entities.lookup(config.getString("blacklist"))
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/target/TargetGoalNearestAttackable.java

@@ -30,6 +30,8 @@ public record TargetGoalNearestAttackable(
         @NotNull Predicate<LivingEntity> targetFilter
 ) implements TargetGoal<Raider> {
     /**
+     * Create a new target goal.
+     *
      * @param target           The type of entities to attack.
      * @param checkVisibility  If visibility should be checked.
      * @param checkCanNavigate If navigation should be checked.
@@ -63,7 +65,6 @@ public record TargetGoalNearestAttackable(
                 return null;
             }
 
-            try {
             if (config.has("targetFilter")) {
                 TestableEntity filter = Entities.lookup(config.getString("targetFilter"));
 
@@ -82,14 +83,6 @@ public record TargetGoalNearestAttackable(
                         config.getInt("reciprocalChance")
                 );
             }
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/target/TargetGoalNearestAttackableWitch.java

@@ -30,6 +30,8 @@ public record TargetGoalNearestAttackableWitch(
         @NotNull Predicate<LivingEntity> targetFilter
 ) implements TargetGoal<Raider> {
     /**
+     * Create a new target goal.
+     *
      * @param target           The type of entities to attack.
      * @param checkVisibility  If visibility should be checked.
      * @param checkCanNavigate If navigation should be checked.
@@ -63,7 +65,6 @@ public record TargetGoalNearestAttackableWitch(
                 return null;
             }
 
-            try {
             if (config.has("targetFilter")) {
                 TestableEntity filter = Entities.lookup(config.getString("targetFilter"));
 
@@ -82,14 +83,6 @@ public record TargetGoalNearestAttackableWitch(
                         config.getInt("reciprocalChance")
                 );
             }
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/target/TargetGoalNearestHealableRaider.java

@@ -26,6 +26,8 @@ public record TargetGoalNearestHealableRaider(
         @NotNull Predicate<LivingEntity> targetFilter
 ) implements TargetGoal<Raider> {
     /**
+     * Create a new target goal.
+     *
      * @param target          The target.
      * @param checkVisibility If visibility should be checked.
      */
@@ -53,7 +55,6 @@ public record TargetGoalNearestHealableRaider(
                 return null;
             }
 
-            try {
             if (config.has("targetFilter")) {
                 TestableEntity filter = Entities.lookup(config.getString("targetFilter"));
 
@@ -68,14 +69,6 @@ public record TargetGoalNearestHealableRaider(
                         config.getBool("checkVisibility")
                 );
             }
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/target/TargetGoalNonTameRandom.java

@@ -26,6 +26,8 @@ public record TargetGoalNonTameRandom(
         @NotNull Predicate<LivingEntity> targetFilter
 ) implements TargetGoal<Tameable> {
     /**
+     * Create a new target goal.
+     *
      * @param target          The types of entities to heal.
      * @param checkVisibility If visibility should be checked.
      */
@@ -53,7 +55,6 @@ public record TargetGoalNonTameRandom(
                 return null;
             }
 
-            try {
             if (config.has("targetFilter")) {
                 TestableEntity filter = Entities.lookup(config.getString("targetFilter"));
 
@@ -68,14 +69,6 @@ public record TargetGoalNonTameRandom(
                         config.getBool("checkVisibility")
                 );
             }
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/ai/target/TargetGoalResetUniversalAnger.java

@@ -36,18 +36,9 @@ public record TargetGoalResetUniversalAnger(
                 return null;
             }
 
-            try {
             return new TargetGoalResetUniversalAnger(
                     config.getBool("triggerOthers")
             );
-            } catch (Exception e) {
-                /*
-                Exceptions could be caused by configs having values of a wrong type,
-                invalid enum parameters, etc. Serializers shouldn't throw exceptions,
-                so we encapsulate them as null.
-                 */
-                return null;
-            }
         }
 
         @NotNull

eco-api/src/main/java/com/willfp/eco/core/entities/args/EntityArgParseResult.java

@@ -7,6 +7,8 @@ import java.util.function.Consumer;
 import java.util.function.Predicate;
 
 /**
+ * The result of an arg parses.
+ *
  * @param test     The test for the entity.
  * @param modifier The modifier to apply to the entity.
  * @see EntityArgParser

eco-api/src/main/java/com/willfp/eco/core/events/EventManager.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.events;
 
+import com.willfp.eco.core.packet.PacketListener;
 import org.bukkit.event.Listener;
 import org.jetbrains.annotations.NotNull;
 
@@ -25,4 +26,11 @@ public interface EventManager {
      * Unregister all listeners associated with the plugin.
      */
     void unregisterAllListeners();
+
+    /**
+     * Register a packet listener.
+     *
+     * @param listener The listener.
+     */
+    void registerPacketListener(@NotNull PacketListener listener);
 }

eco-api/src/main/java/com/willfp/eco/core/fast/FastItemStack.java

@@ -20,18 +20,6 @@ import java.util.Set;
  * FastItemStack contains methods to modify and read items faster than in default bukkit.
  */
 public interface FastItemStack extends PersistentDataHolder {
-    /**
-     * Get all enchantments on an item.
-     *
-     * @param checkStored If stored NBT should also be checked.
-     * @return A map of all enchantments.
-     * @deprecated Poorly named method. Use getEnchants instead.
-     */
-    @Deprecated(since = "6.24.0", forRemoval = true)
-    default Map<Enchantment, Integer> getEnchantmentsOnItem(boolean checkStored) {
-        return getEnchants(checkStored);
-    }
-
     /**
      * Get all enchantments on an item.
      * Does not account for stored enchants.
@@ -51,33 +39,6 @@ public interface FastItemStack extends PersistentDataHolder {
     @NotNull
     Map<Enchantment, Integer> getEnchants(boolean checkStored);
 
-    /**
-     * Get the level of an enchantment on an item.
-     *
-     * @param enchantment The enchantment.
-     * @return The enchantment level, or 0 if not found.
-     * @deprecated Poorly named method. Use getEnchantmentLevel instead.
-     */
-    @Deprecated(since = "6.34.0", forRemoval = true)
-    default int getLevelOnItem(@NotNull Enchantment enchantment) {
-        return getEnchantmentLevel(enchantment, false);
-    }
-
-    /**
-     * Get the level of an enchantment on an item.
-     *
-     * @param enchantment The enchantment.
-     * @param checkStored If the stored NBT should also be checked.
-     * @return The enchantment level, or 0 if not found.
-     * @deprecated Poorly named method. Use getEnchantmentLevel instead.
-     */
-    @Deprecated(since = "6.34.0", forRemoval = true)
-    @SuppressWarnings("DeprecatedIsStillUsed")
-    default int getLevelOnItem(@NotNull Enchantment enchantment,
-                               boolean checkStored) {
-        return getEnchantmentLevel(enchantment, checkStored);
-    }
-
     /**
      * Get the level of an enchantment.
      *
@@ -85,7 +46,7 @@ public interface FastItemStack extends PersistentDataHolder {
      * @return The enchantment level, or 0 if not found.
      */
     default int getEnchantmentLevel(@NotNull Enchantment enchantment) {
-        return getLevelOnItem(enchantment, false);
+        return getEnchantmentLevel(enchantment, false);
     }
 
     /**

eco-api/src/main/java/com/willfp/eco/core/gui/menu/Menu.java

@@ -3,20 +3,15 @@ package com.willfp.eco.core.gui.menu;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.gui.page.Page;
 import com.willfp.eco.core.gui.slot.Slot;
-import com.willfp.eco.util.NamespacedKeyUtils;
-import org.bukkit.NamespacedKey;
 import org.bukkit.entity.Player;
 import org.bukkit.inventory.Inventory;
 import org.bukkit.inventory.ItemStack;
-import org.bukkit.persistence.PersistentDataType;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 import java.util.Map;
 import java.util.Objects;
-import java.util.Set;
-import java.util.stream.Collectors;
 
 /**
  * GUI version of {@link Inventory}.
@@ -240,58 +235,6 @@ public interface Menu {
         return Objects.requireNonNullElse(pageState, Integer.MAX_VALUE);
     }
 
-    /**
-     * Write data.
-     *
-     * @param player The player.
-     * @param key    The key.
-     * @param type   The type.
-     * @param value  The value.
-     * @param <T>    The type.
-     * @param <Z>    The type.
-     * @deprecated Use addState instead.
-     */
-    @Deprecated(since = "6.35.0", forRemoval = true)
-    default <T, Z> void writeData(@NotNull final Player player,
-                                  @NotNull final NamespacedKey key,
-                                  @NotNull final PersistentDataType<T, Z> type,
-                                  @NotNull final Z value) {
-        this.setState(player, key.toString(), value);
-    }
-
-    /**
-     * Read data.
-     *
-     * @param player The player.
-     * @param key    The key.
-     * @param type   The type.
-     * @param <T>    The type.
-     * @param <Z>    The type.
-     * @return The data.
-     * @deprecated Use getState instead.
-     */
-    @Deprecated(since = "6.35.0", forRemoval = true)
-    default @Nullable <T, Z> T readData(@NotNull final Player player,
-                                        @NotNull final NamespacedKey key,
-                                        @NotNull final PersistentDataType<T, Z> type) {
-        return this.getState(player, key.toString());
-    }
-
-    /**
-     * Get all data keys for a player.
-     *
-     * @param player The player.
-     * @return The keys.
-     * @deprecated Use getState instead.
-     */
-    @Deprecated(since = "6.35.0", forRemoval = true)
-    default Set<NamespacedKey> getKeys(@NotNull final Player player) {
-        return this.getState(player).keySet().stream()
-                .map(NamespacedKeyUtils::fromStringOrNull)
-                .filter(Objects::nonNull)
-                .collect(Collectors.toSet());
-    }
-
     /**
      * Create a builder with a given amount of rows.
      *

eco-api/src/main/java/com/willfp/eco/core/gui/slot/CustomSlot.java

@@ -90,17 +90,4 @@ public abstract class CustomSlot implements Slot {
     public final Slot getSlotAt(int row, int column) {
         return Slot.super.getSlotAt(row, column);
     }
-
-    /**
-     * Get the delegate slot.
-     * <p>
-     * This is not required to add the slot to a menu, but is instead used internally.
-     *
-     * @return The slot.
-     * @deprecated Replaced with {@link Slot#getActionableSlot(Player, Menu)}
-     */
-    @Deprecated(since = "6.43.0", forRemoval = true)
-    public Slot getDelegate() {
-        return this.delegate;
-    }
 }

eco-api/src/main/java/com/willfp/eco/core/gui/slot/Slot.java

@@ -158,27 +158,4 @@ public interface Slot extends GUIComponent {
     static SlotBuilder builder(@NotNull final SlotProvider provider) {
         return Eco.get().createSlotBuilder(provider);
     }
-
-    /**
-     * If the slot is not captive for a player.
-     *
-     * @param player The player.
-     * @return If not captive for the player.
-     * @deprecated Captivity is now reactive, this method can produce incorrect results.
-     */
-    @Deprecated(since = "6.43.0", forRemoval = true)
-    default boolean isNotCaptiveFor(@NotNull Player player) {
-        return false;
-    }
-
-    /**
-     * If the slot is captive. (Can items be placed in it).
-     *
-     * @return If captive.
-     * @deprecated Captivity is now reactive, this method can produce incorrect results.
-     */
-    @Deprecated(since = "6.43.0", forRemoval = true)
-    default boolean isCaptive() {
-        return false;
-    }
 }

eco-api/src/main/java/com/willfp/eco/core/integrations/Integration.java

@@ -1,13 +1,22 @@
 package com.willfp.eco.core.integrations;
 
+import com.willfp.eco.core.registry.Registrable;
+import com.willfp.eco.core.registry.Registry;
+import org.jetbrains.annotations.NotNull;
+
 /**
  * Abstract class for integrations.
  */
-public interface Integration {
+public interface Integration extends Registrable {
     /**
      * Get the name of integration.
      *
      * @return The name.
      */
     String getPluginName();
+
+    @Override
+    default @NotNull String getID() {
+        return Registry.tryFitPattern(this.getPluginName());
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/integrations/IntegrationRegistry.java

@@ -0,0 +1,131 @@
+package com.willfp.eco.core.integrations;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.registry.Registry;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.HashSet;
+import java.util.function.Consumer;
+import java.util.function.Function;
+import java.util.function.Predicate;
+import java.util.function.Supplier;
+
+/**
+ * Registry for integrations.
+ *
+ * @param <T> The type of integration.
+ */
+public class IntegrationRegistry<T extends Integration> extends Registry<T> {
+    @Override
+    public @NotNull T register(@NotNull final T element) {
+        return executeSafely(() -> super.register(element), element);
+    }
+
+    /**
+     * Iterate over all integrations, safely.
+     *
+     * @param action The action to perform.
+     */
+    public void forEachSafely(@NotNull final Consumer<T> action) {
+        for (T integration : new HashSet<>(this.values())) {
+            executeSafely(() -> action.accept(integration), integration);
+        }
+    }
+
+    /**
+     * If any integrations return true, safely.
+     *
+     * @param predicate The predicate to test.
+     * @return If any integrations return true.
+     */
+    public boolean anySafely(@NotNull final Predicate<T> predicate) {
+        for (T integration : new HashSet<>(this.values())) {
+            Boolean result = executeSafely(() -> predicate.test(integration), integration);
+            if (result != null && result) {
+                return true;
+            }
+        }
+        return false;
+    }
+
+    /**
+     * Get the first integration that returns a value, safely.
+     *
+     * @param function     The function to apply.
+     * @param defaultValue The default value.
+     * @param <R>          The type of value.
+     * @return The first value that returns a value.
+     */
+    @NotNull
+    public <R> R firstSafely(@NotNull final Function<T, R> function,
+                             @NotNull final R defaultValue) {
+        if (this.isEmpty()) {
+            return defaultValue;
+        }
+
+        T integration = this.iterator().next();
+
+        return executeSafely(() -> function.apply(integration), integration, defaultValue);
+    }
+
+    /**
+     * Executes a given action safely, catching any exceptions and logging the issue.
+     *
+     * @param action      The action to execute.
+     * @param integration The integration to apply the action on.
+     */
+    private void executeSafely(@NotNull final Runnable action,
+                               @NotNull final T integration) {
+        executeSafely(() -> {
+            action.run();
+            return null;
+        }, integration);
+    }
+
+    /**
+     * Executes a given action safely, catching any exceptions and logging the issue.
+     *
+     * @param action      The action to execute.
+     * @param integration The integration to apply the action on.
+     * @param <R>         The return type of the action.
+     * @return The result of the action, or null if an exception was thrown.
+     */
+    private <R> R executeSafely(@NotNull final Supplier<R> action,
+                                @NotNull final T integration) {
+        return executeSafely(action, integration, null);
+    }
+
+    /**
+     * Executes a given action safely, catching any exceptions and logging the issue.
+     *
+     * @param action       The action to execute.
+     * @param integration  The integration to apply the action on.
+     * @param defaultValue The default value to return if an exception is thrown.
+     * @param <R>          The return type of the action.
+     * @return The result of the action, or the default value if an exception was thrown.
+     */
+    private <R> R executeSafely(@NotNull final Supplier<R> action,
+                                @NotNull final T integration,
+                                @Nullable final R defaultValue) {
+        try {
+            return action.get();
+        } catch (final Exception e) {
+            Eco.get().getEcoPlugin().getLogger().warning("Integration for " + integration.getPluginName() + " threw an exception!");
+            Eco.get().getEcoPlugin().getLogger().warning("The integration will be disabled.");
+            e.printStackTrace();
+            this.remove(integration.getPluginName());
+            return defaultValue;
+        }
+    }
+
+    /**
+     * If all integrations return true, safely.
+     *
+     * @param predicate The predicate to test.
+     * @return If all integrations return true.
+     */
+    public boolean allSafely(@NotNull final Predicate<T> predicate) {
+        return !this.anySafely(predicate.negate());
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/afk/AFKManager.java

@@ -1,11 +1,9 @@
 package com.willfp.eco.core.integrations.afk;
 
+import com.willfp.eco.core.integrations.IntegrationRegistry;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.HashSet;
-import java.util.Set;
-
 /**
  * Class to handle afk integrations.
  */
@@ -13,7 +11,7 @@ public final class AFKManager {
     /**
      * A set of all registered integrations.
      */
-    private static final Set<AFKIntegration> REGISTERED = new HashSet<>();
+    private static final IntegrationRegistry<AFKIntegration> REGISTRY = new IntegrationRegistry<>();
 
     /**
      * Register a new integration.
@@ -21,8 +19,7 @@ public final class AFKManager {
      * @param integration The integration to register.
      */
     public static void register(@NotNull final AFKIntegration integration) {
-        REGISTERED.removeIf(it -> it.getPluginName().equalsIgnoreCase(integration.getPluginName()));
+        REGISTRY.register(integration);
-        REGISTERED.add(integration);
     }
 
     /**
@@ -32,13 +29,7 @@ public final class AFKManager {
      * @return If afk.
      */
     public static boolean isAfk(@NotNull final Player player) {
-        for (AFKIntegration integration : REGISTERED) {
+        return REGISTRY.anySafely(integration -> integration.isAfk(player));
-            if (integration.isAfk(player)) {
-                return true;
-            }
-        }
-
-        return false;
     }
 
     private AFKManager() {

eco-api/src/main/java/com/willfp/eco/core/integrations/afk/AFKWrapper.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.core.integrations.afk;
-
-/**
- * Wrapper class for afk integrations.
- *
- * @deprecated Use AFKIntegration instead.
- */
-@Deprecated(since = "6.35.0", forRemoval = true)
-public interface AFKWrapper extends AFKIntegration {
-
-}

eco-api/src/main/java/com/willfp/eco/core/integrations/anticheat/AnticheatManager.java

@@ -1,14 +1,11 @@
 package com.willfp.eco.core.integrations.anticheat;
 
 import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
+import com.willfp.eco.core.integrations.IntegrationRegistry;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Listener;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.HashSet;
-import java.util.Set;
-
 /**
  * Class to handle anticheat integrations.
  */
@@ -16,20 +13,7 @@ public final class AnticheatManager {
     /**
      * A set of all registered anticheats.
      */
-    private static final Set<AnticheatIntegration> ANTICHEATS = new HashSet<>();
+    private static final IntegrationRegistry<AnticheatIntegration> REGISTRY = new IntegrationRegistry<>();
-
-    /**
-     * Register a new anticheat.
-     *
-     * @param plugin    The plugin.
-     * @param anticheat The anticheat to register.
-     * @deprecated Don't pass instance of eco.
-     */
-    @Deprecated(since = "6.35.0", forRemoval = true)
-    public static void register(@NotNull final EcoPlugin plugin,
-                                @NotNull final AnticheatIntegration anticheat) {
-        register(anticheat);
-    }
 
     /**
      * Register a new anticheat.
@@ -40,8 +24,7 @@ public final class AnticheatManager {
         if (anticheat instanceof Listener) {
             Eco.get().getEcoPlugin().getEventManager().registerListener((Listener) anticheat);
         }
-        ANTICHEATS.removeIf(it -> it.getPluginName().equalsIgnoreCase(anticheat.getPluginName()));
+        REGISTRY.register(anticheat);
-        ANTICHEATS.add(anticheat);
     }
 
     /**
@@ -50,17 +33,16 @@ public final class AnticheatManager {
      * @param player The player to exempt.
      */
     public static void exemptPlayer(@NotNull final Player player) {
-        ANTICHEATS.forEach(anticheat -> anticheat.exempt(player));
+        REGISTRY.forEachSafely(anticheat -> anticheat.exempt(player));
     }
 
     /**
      * Unexempt a player from triggering anticheats.
-     * This is ran a tick after it is called to ensure that there are no event timing conflicts.
      *
      * @param player The player to remove the exemption.
      */
     public static void unexemptPlayer(@NotNull final Player player) {
-        ANTICHEATS.forEach(anticheat -> anticheat.unexempt(player));
+        REGISTRY.forEachSafely(anticheat -> anticheat.unexempt(player));
     }
 
     private AnticheatManager() {

eco-api/src/main/java/com/willfp/eco/core/integrations/anticheat/AnticheatWrapper.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.core.integrations.anticheat;
-
-/**
- * Wrapper class for anticheat integrations.
- *
- * @deprecated Use AnticheatIntegration instead.
- */
-@Deprecated(since = "6.35.0", forRemoval = true)
-public interface AnticheatWrapper extends AnticheatIntegration {
-
-}

eco-api/src/main/java/com/willfp/eco/core/integrations/antigrief/AntigriefManager.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.integrations.antigrief;
 
+import com.willfp.eco.core.integrations.IntegrationRegistry;
 import org.bukkit.Location;
 import org.bukkit.block.Block;
 import org.bukkit.entity.LivingEntity;
@@ -16,7 +17,7 @@ public final class AntigriefManager {
     /**
      * Registered antigriefs.
      */
-    private static final Set<AntigriefIntegration> REGISTERED = new HashSet<>();
+    private static final IntegrationRegistry<AntigriefIntegration> REGISTRY = new IntegrationRegistry<>();
 
     /**
      * Register a new AntiGrief/Land Management integration.
@@ -24,8 +25,7 @@ public final class AntigriefManager {
      * @param antigrief The integration to register.
      */
     public static void register(@NotNull final AntigriefIntegration antigrief) {
-        REGISTERED.removeIf(it -> it.getPluginName().equalsIgnoreCase(antigrief.getPluginName()));
+        REGISTRY.register(antigrief);
-        REGISTERED.add(antigrief);
     }
 
     /**
@@ -34,8 +34,7 @@ public final class AntigriefManager {
      * @param antigrief The integration to unregister.
      */
     public static void unregister(@NotNull final AntigriefIntegration antigrief) {
-        REGISTERED.removeIf(it -> it.getPluginName().equalsIgnoreCase(antigrief.getPluginName()));
+        REGISTRY.remove(antigrief);
-        REGISTERED.remove(antigrief);
     }
 
     /**
@@ -47,7 +46,7 @@ public final class AntigriefManager {
      */
     public static boolean canPickupItem(@NotNull final Player player,
                                         @NotNull final Location location) {
-        return REGISTERED.stream().allMatch(antigriefIntegration -> antigriefIntegration.canPickupItem(player, location));
+        return REGISTRY.allSafely(integration -> integration.canPickupItem(player, location));
     }
 
     /**
@@ -59,7 +58,7 @@ public final class AntigriefManager {
      */
     public static boolean canBreakBlock(@NotNull final Player player,
                                         @NotNull final Block block) {
-        return REGISTERED.stream().allMatch(antigriefIntegration -> antigriefIntegration.canBreakBlock(player, block));
+        return REGISTRY.allSafely(integration -> integration.canBreakBlock(player, block));
     }
 
     /**
@@ -71,7 +70,7 @@ public final class AntigriefManager {
      */
     public static boolean canCreateExplosion(@NotNull final Player player,
                                              @NotNull final Location location) {
-        return REGISTERED.stream().allMatch(antigriefIntegration -> antigriefIntegration.canCreateExplosion(player, location));
+        return REGISTRY.allSafely(integration -> integration.canCreateExplosion(player, location));
     }
 
     /**
@@ -83,7 +82,7 @@ public final class AntigriefManager {
      */
     public static boolean canPlaceBlock(@NotNull final Player player,
                                         @NotNull final Block block) {
-        return REGISTERED.stream().allMatch(antigriefIntegration -> antigriefIntegration.canPlaceBlock(player, block));
+        return REGISTRY.allSafely(integration -> integration.canPlaceBlock(player, block));
     }
 
     /**
@@ -95,7 +94,7 @@ public final class AntigriefManager {
      */
     public static boolean canInjure(@NotNull final Player player,
                                     @NotNull final LivingEntity victim) {
-        return REGISTERED.stream().allMatch(antigriefIntegration -> antigriefIntegration.canInjure(player, victim));
+        return REGISTRY.allSafely(integration -> integration.canInjure(player, victim));
     }
 
     private AntigriefManager() {

eco-api/src/main/java/com/willfp/eco/core/integrations/antigrief/AntigriefWrapper.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.core.integrations.antigrief;
-
-/**
- * Wrapper class for antigrief integrations.
- *
- * @deprecated Use AntigriefIntegration instead.
- */
-@Deprecated(since = "6.35.0", forRemoval = true)
-public interface AntigriefWrapper extends AntigriefIntegration {
-
-}

eco-api/src/main/java/com/willfp/eco/core/integrations/customentities/CustomEntitiesManager.java

@@ -1,10 +1,8 @@
 package com.willfp.eco.core.integrations.customentities;
 
+import com.willfp.eco.core.integrations.IntegrationRegistry;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.HashSet;
-import java.util.Set;
-
 /**
  * Class to handle custom entity integrations.
  */
@@ -12,7 +10,7 @@ public final class CustomEntitiesManager {
     /**
      * A set of all registered integrations.
      */
-    private static final Set<CustomEntitiesIntegration> REGISTERED = new HashSet<>();
+    private static final IntegrationRegistry<CustomEntitiesIntegration> REGISTRY = new IntegrationRegistry<>();
 
     /**
      * Register a new integration.
@@ -20,8 +18,7 @@ public final class CustomEntitiesManager {
      * @param integration The integration to register.
      */
     public static void register(@NotNull final CustomEntitiesIntegration integration) {
-        REGISTERED.removeIf(it -> it.getPluginName().equalsIgnoreCase(integration.getPluginName()));
+        REGISTRY.register(integration);
-        REGISTERED.add(integration);
     }
 
     /**
@@ -30,9 +27,7 @@ public final class CustomEntitiesManager {
      * @see com.willfp.eco.core.entities.Entities
      */
     public static void registerAllEntities() {
-        for (CustomEntitiesIntegration integration : REGISTERED) {
+        REGISTRY.forEachSafely(CustomEntitiesIntegration::registerAllEntities);
-            integration.registerAllEntities();
-        }
     }
 
     private CustomEntitiesManager() {

eco-api/src/main/java/com/willfp/eco/core/integrations/customentities/CustomEntitiesWrapper.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.core.integrations.customentities;
-
-/**
- * Wrapper class for custom item integrations.
- *
- * @deprecated Use CustomEntitiesIntegration instead.
- */
-@Deprecated(since = "6.35.0", forRemoval = true)
-public interface CustomEntitiesWrapper extends CustomEntitiesIntegration {
-
-}

eco-api/src/main/java/com/willfp/eco/core/integrations/customitems/CustomItemsManager.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.integrations.customitems;
 
+import com.willfp.eco.core.integrations.IntegrationRegistry;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.HashSet;
@@ -12,7 +13,7 @@ public final class CustomItemsManager {
     /**
      * A set of all registered integrations.
      */
-    private static final Set<CustomItemsIntegration> REGISTERED = new HashSet<>();
+    private static final IntegrationRegistry<CustomItemsIntegration> REGISTRY = new IntegrationRegistry<>();
 
     /**
      * Register a new integration.
@@ -20,8 +21,7 @@ public final class CustomItemsManager {
      * @param integration The integration to register.
      */
     public static void register(@NotNull final CustomItemsIntegration integration) {
-        REGISTERED.removeIf(it -> it.getPluginName().equalsIgnoreCase(integration.getPluginName()));
+        REGISTRY.register(integration);
-        REGISTERED.add(integration);
     }
 
     /**
@@ -30,9 +30,7 @@ public final class CustomItemsManager {
      * @see com.willfp.eco.core.items.Items
      */
     public static void registerAllItems() {
-        for (CustomItemsIntegration customItemsIntegration : REGISTERED) {
+        REGISTRY.forEachSafely(CustomItemsIntegration::registerAllItems);
-            customItemsIntegration.registerAllItems();
-        }
     }
 
     /**
@@ -41,9 +39,7 @@ public final class CustomItemsManager {
      * @see com.willfp.eco.core.items.Items
      */
     public static void registerProviders() {
-        for (CustomItemsIntegration customItemsIntegration : REGISTERED) {
+        REGISTRY.forEachSafely(CustomItemsIntegration::registerProvider);
-            customItemsIntegration.registerProvider();
-        }
     }
 
     private CustomItemsManager() {

eco-api/src/main/java/com/willfp/eco/core/integrations/customitems/CustomItemsWrapper.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.core.integrations.customitems;
-
-/**
- * Wrapper class for custom item integrations.
- *
- * @deprecated Use CustomItemsIntegration instead.
- */
-@Deprecated(since = "6.35.0", forRemoval = true)
-public interface CustomItemsWrapper extends CustomItemsIntegration {
-
-}

eco-api/src/main/java/com/willfp/eco/core/integrations/economy/EconomyManager.java

@@ -1,11 +1,10 @@
 package com.willfp.eco.core.integrations.economy;
 
+import com.willfp.eco.core.integrations.IntegrationRegistry;
 import org.bukkit.OfflinePlayer;
 import org.jetbrains.annotations.NotNull;
 
 import java.math.BigDecimal;
-import java.util.HashSet;
-import java.util.Set;
 
 /**
  * Class to handle economy.
@@ -14,7 +13,7 @@ public final class EconomyManager {
     /**
      * A set of all registered integrations.
      */
-    private static final Set<EconomyIntegration> REGISTERED = new HashSet<>();
+    private static final IntegrationRegistry<EconomyIntegration> REGISTRY = new IntegrationRegistry<>();
 
     /**
      * Register a new integration.
@@ -22,8 +21,7 @@ public final class EconomyManager {
      * @param integration The integration to register.
      */
     public static void register(@NotNull final EconomyIntegration integration) {
-        REGISTERED.removeIf(it -> it.getPluginName().equalsIgnoreCase(integration.getPluginName()));
+        REGISTRY.register(integration);
-        REGISTERED.add(integration);
     }
 
     /**
@@ -32,7 +30,7 @@ public final class EconomyManager {
      * @return If any economy.
      */
     public static boolean hasRegistrations() {
-        return !REGISTERED.isEmpty();
+        return REGISTRY.isNotEmpty();
     }
 
     /**
@@ -56,11 +54,10 @@ public final class EconomyManager {
      */
     public static boolean hasAmount(@NotNull final OfflinePlayer player,
                                     final BigDecimal amount) {
-        for (EconomyIntegration integration : REGISTERED) {
+        return REGISTRY.firstSafely(
-            return integration.hasAmount(player, amount);
+                integration -> integration.hasAmount(player, amount),
-        }
+                false
-
+        );
-        return false;
     }
 
     /**
@@ -84,11 +81,10 @@ public final class EconomyManager {
      */
     public static boolean giveMoney(@NotNull final OfflinePlayer player,
                                     @NotNull final BigDecimal amount) {
-        for (EconomyIntegration integration : REGISTERED) {
+        return REGISTRY.firstSafely(
-            return integration.giveMoney(player, amount);
+                integration -> integration.giveMoney(player, amount),
-        }
+                false
-
+        );
-        return false;
     }
 
     /**
@@ -112,11 +108,10 @@ public final class EconomyManager {
      */
     public static boolean removeMoney(@NotNull final OfflinePlayer player,
                                       @NotNull final BigDecimal amount) {
-        for (EconomyIntegration integration : REGISTERED) {
+        return REGISTRY.firstSafely(
-            return integration.removeMoney(player, amount);
+                integration -> integration.removeMoney(player, amount),
-        }
+                false
-
+        );
-        return false;
     }
 
     /**
@@ -136,11 +131,10 @@ public final class EconomyManager {
      * @return The balance.
      */
     public static BigDecimal getExactBalance(@NotNull final OfflinePlayer player) {
-        for (EconomyIntegration integration : REGISTERED) {
+        return REGISTRY.firstSafely(
-            return integration.getExactBalance(player);
+                integration -> integration.getExactBalance(player),
-        }
+                BigDecimal.ZERO
-
+        );
-        return BigDecimal.ZERO;
     }
 
     private EconomyManager() {

eco-api/src/main/java/com/willfp/eco/core/integrations/economy/EconomyWrapper.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.core.integrations.economy;
-
-/**
- * Wrapper class for economy integrations.
- *
- * @deprecated Use EconomyIntegration instead.
- */
-@Deprecated(since = "6.35.0", forRemoval = true)
-public interface EconomyWrapper extends EconomyIntegration {
-
-}

eco-api/src/main/java/com/willfp/eco/core/integrations/guidetection/GUIDetectionIntegration.java

@@ -0,0 +1,18 @@
+package com.willfp.eco.core.integrations.guidetection;
+
+import com.willfp.eco.core.integrations.Integration;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Wrapper class for GUI integrations.
+ */
+public interface GUIDetectionIntegration extends Integration {
+    /**
+     * Determine if a player is in a GUI.
+     *
+     * @param player The player.
+     * @return If the player is in a GUI.
+     */
+    boolean hasGUIOpen(@NotNull final Player player);
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/guidetection/GUIDetectionManager.java

@@ -0,0 +1,43 @@
+package com.willfp.eco.core.integrations.guidetection;
+
+import com.willfp.eco.core.integrations.IntegrationRegistry;
+import com.willfp.eco.util.MenuUtils;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Class to handle GUI detection.
+ */
+public final class GUIDetectionManager {
+    /**
+     * A set of all registered integrations.
+     */
+    private static final IntegrationRegistry<GUIDetectionIntegration> REGISTRY = new IntegrationRegistry<>();
+
+    /**
+     * Register a new integration.
+     *
+     * @param integration The integration to register.
+     */
+    public static void register(@NotNull final GUIDetectionIntegration integration) {
+        REGISTRY.register(integration);
+    }
+
+    /**
+     * Get if a player is in a GUI.
+     *
+     * @param player The player.
+     * @return If the player has a GUI open.
+     */
+    public static boolean hasGUIOpen(@NotNull final Player player) {
+        if (MenuUtils.getOpenMenu(player) != null) {
+            return true;
+        }
+
+        return REGISTRY.anySafely(integration -> integration.hasGUIOpen(player));
+    }
+
+    private GUIDetectionManager() {
+        throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/integrations/hologram/HologramManager.java

@@ -1,11 +1,10 @@
 package com.willfp.eco.core.integrations.hologram;
 
+import com.willfp.eco.core.integrations.IntegrationRegistry;
 import org.bukkit.Location;
 import org.jetbrains.annotations.NotNull;
 
-import java.util.HashSet;
 import java.util.List;
-import java.util.Set;
 
 /**
  * Class to handle hologram integrations.
@@ -14,7 +13,7 @@ public final class HologramManager {
     /**
      * A set of all registered integrations.
      */
-    private static final Set<HologramIntegration> REGISTERED = new HashSet<>();
+    private static final IntegrationRegistry<HologramIntegration> REGISTRY = new IntegrationRegistry<>();
 
     /**
      * Register a new integration.
@@ -22,8 +21,7 @@ public final class HologramManager {
      * @param integration The integration to register.
      */
     public static void register(@NotNull final HologramIntegration integration) {
-        REGISTERED.removeIf(it -> it.getPluginName().equalsIgnoreCase(integration.getPluginName()));
+        REGISTRY.register(integration);
-        REGISTERED.add(integration);
     }
 
     /**
@@ -35,11 +33,10 @@ public final class HologramManager {
      */
     public static Hologram createHologram(@NotNull final Location location,
                                           @NotNull final List<String> contents) {
-        for (HologramIntegration integration : REGISTERED) {
+        return REGISTRY.firstSafely(
-            return integration.createHologram(location, contents);
+                integration -> integration.createHologram(location, contents),
-        }
+                new DummyHologram()
-
+        );
-        return new DummyHologram();
     }
 
     private HologramManager() {

eco-api/src/main/java/com/willfp/eco/core/integrations/hologram/HologramWrapper.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.core.integrations.hologram;
-
-/**
- * Wrapper class for hologram integrations.
- *
- * @deprecated Use HologramIntegration instead.
- */
-@Deprecated(since = "6.35.0", forRemoval = true)
-public interface HologramWrapper extends HologramIntegration {
-
-}

eco-api/src/main/java/com/willfp/eco/core/integrations/mcmmo/McmmoManager.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.integrations.mcmmo;
 
+import com.willfp.eco.core.integrations.IntegrationRegistry;
 import org.bukkit.block.Block;
 import org.bukkit.event.Event;
 import org.jetbrains.annotations.NotNull;
@@ -14,7 +15,7 @@ public final class McmmoManager {
     /**
      * A set of all registered integrations.
      */
-    private static final Set<McmmoIntegration> REGISTERED = new HashSet<>();
+    private static final IntegrationRegistry<McmmoIntegration> REGISTERED = new IntegrationRegistry<>();
 
     /**
      * Register a new integration.
@@ -22,8 +23,7 @@ public final class McmmoManager {
      * @param integration The integration to register.
      */
     public static void register(@NotNull final McmmoIntegration integration) {
-        REGISTERED.removeIf(it -> it.getPluginName().equalsIgnoreCase(integration.getPluginName()));
+        REGISTERED.register(integration);
-        REGISTERED.add(integration);
     }
 
     /**
@@ -34,13 +34,11 @@ public final class McmmoManager {
      */
     public static int getBonusDropCount(@NotNull final Block block) {
         int finalValue = 0;
+
         for (McmmoIntegration mcmmoIntegration : REGISTERED) {
             finalValue += mcmmoIntegration.getBonusDropCount(block);
-            
-
-
-            
         }
+
         return finalValue;
     }
 
@@ -51,13 +49,7 @@ public final class McmmoManager {
      * @return If the event is fake.
      */
     public static boolean isFake(@NotNull final Event event) {
-        for (McmmoIntegration mcmmoIntegration : REGISTERED) {
+        return REGISTERED.anySafely(integration -> integration.isFake(event));
-            if (mcmmoIntegration.isFake(event)) {
-                return true;
-            }
-
-        }
-        return false;
     }
 
     private McmmoManager() {

eco-api/src/main/java/com/willfp/eco/core/integrations/mcmmo/McmmoWrapper.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.core.integrations.mcmmo;
-
-/**
- * Wrapper class for mcmmo integrations.
- *
- * @deprecated Use McmmoIntegration instead.
- */
-@Deprecated(since = "6.35.0", forRemoval = true)
-public interface McmmoWrapper extends McmmoIntegration {
-
-}

eco-api/src/main/java/com/willfp/eco/core/integrations/placeholder/PlaceholderEntry.java

@@ -1,190 +0,0 @@
-package com.willfp.eco.core.integrations.placeholder;
-
-import com.willfp.eco.core.Eco;
-import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.placeholder.Placeholder;
-import com.willfp.eco.core.placeholder.PlayerPlaceholder;
-import com.willfp.eco.core.placeholder.PlayerlessPlaceholder;
-import org.apache.commons.lang.Validate;
-import org.bukkit.entity.Player;
-import org.jetbrains.annotations.NotNull;
-import org.jetbrains.annotations.Nullable;
-
-import java.util.Objects;
-import java.util.function.Function;
-
-/**
- * A placeholder entry is a placeholder in and of itself.
- * <p>
- * It should be fairly straightforward.
- *
- * @deprecated Confusing functionality with inconsistent nullability and poor naming.
- */
-@Deprecated(since = "6.28.0", forRemoval = true)
-public class PlaceholderEntry {
-    /**
-     * The name of the placeholder, used in lookups.
-     */
-    private final String identifier;
-
-    /**
-     * The lambda to retrieve the output of the placeholder given a player.
-     */
-    private final Function<Player, String> function;
-
-    /**
-     * If the placeholder requires a player to lookup.
-     */
-    private final boolean requiresPlayer;
-
-    /**
-     * The plugin for the placeholder.
-     */
-    @Nullable
-    private final EcoPlugin plugin;
-
-    /**
-     * Create a placeholder entry that doesn't require a player.
-     *
-     * @param identifier The identifier of the placeholder.
-     * @param function   A lambda to get the result of the placeholder given a player.
-     * @deprecated Specify a plugin.
-     */
-    @Deprecated
-    public PlaceholderEntry(@NotNull final String identifier,
-                            @NotNull final Function<Player, String> function) {
-        this(identifier, function, false);
-    }
-
-    /**
-     * Create a placeholder entry that may require a player.
-     *
-     * @param identifier     The identifier of the placeholder.
-     * @param function       A lambda to get the result of the placeholder.
-     * @param requiresPlayer If the placeholder requires a player.
-     * @deprecated Specify a plugin.
-     */
-    @Deprecated
-    public PlaceholderEntry(@NotNull final String identifier,
-                            @NotNull final Function<Player, String> function,
-                            final boolean requiresPlayer) {
-        this(null, identifier, function, requiresPlayer);
-    }
-
-    /**
-     * Create a placeholder entry that doesn't require a player.
-     *
-     * @param plugin     The plugin for the placeholder.
-     * @param identifier The identifier of the placeholder.
-     * @param function   A lambda to get the result of the placeholder given a player.
-     */
-    public PlaceholderEntry(@Nullable final EcoPlugin plugin,
-                            @NotNull final String identifier,
-                            @NotNull final Function<Player, String> function) {
-        this(plugin, identifier, function, false);
-    }
-
-    /**
-     * Create a placeholder entry that may require a player.
-     *
-     * @param plugin         The plugin for the placeholder.
-     * @param identifier     The identifier of the placeholder.
-     * @param function       A lambda to get the result of the placeholder.
-     * @param requiresPlayer If the placeholder requires a player.
-     */
-    public PlaceholderEntry(@Nullable final EcoPlugin plugin,
-                            @NotNull final String identifier,
-                            @NotNull final Function<Player, String> function,
-                            final boolean requiresPlayer) {
-        this.plugin = plugin;
-        this.identifier = identifier;
-        this.function = function;
-        this.requiresPlayer = requiresPlayer;
-    }
-
-    /**
-     * Get the result of the placeholder with respect to a player.
-     *
-     * @param player The player to translate with respect to.
-     * @return The result of the placeholder.
-     */
-    public String getResult(@Nullable final Player player) {
-        if (player == null) {
-            Validate.isTrue(!requiresPlayer, "null player passed to requiresPlayer placeholder.");
-        }
-        return this.function.apply(player);
-    }
-
-    /**
-     * Get if the placeholder requires a player to get a result.
-     *
-     * @return If the placeholder requires a player.
-     */
-    public boolean requiresPlayer() {
-        return requiresPlayer;
-    }
-
-    /**
-     * Get the identifier.
-     *
-     * @return The identifier.
-     */
-    public String getIdentifier() {
-        return identifier;
-    }
-
-    /**
-     * Get the plugin.
-     *
-     * @return The plugin.
-     */
-    @Nullable
-    public EcoPlugin getPlugin() {
-        return plugin;
-    }
-
-    /**
-     * Register the placeholder.
-     */
-    public void register() {
-        PlaceholderManager.registerPlaceholder(this.toModernPlaceholder());
-    }
-
-    /**
-     * Convert the placeholder to a modern placeholder.
-     *
-     * @return The placeholder.
-     */
-    Placeholder toModernPlaceholder() {
-        if (this.requiresPlayer) {
-            return new PlayerPlaceholder(
-                    Objects.requireNonNullElse(plugin, Eco.get().getEcoPlugin()),
-                    identifier,
-                    function
-            );
-        } else {
-            return new PlayerlessPlaceholder(
-                    Objects.requireNonNullElse(plugin, Eco.get().getEcoPlugin()),
-                    identifier,
-                    () -> function.apply(null)
-            );
-        }
-    }
-
-    @Override
-    public boolean equals(@Nullable final Object o) {
-        if (this == o) {
-            return true;
-        }
-        if (!(o instanceof PlaceholderEntry entry)) {
-            return false;
-        }
-        return Objects.equals(this.getIdentifier(), entry.getIdentifier())
-                && Objects.equals(this.getPlugin(), entry.getPlugin());
-    }
-
-    @Override
-    public int hashCode() {
-        return Objects.hash(this.getIdentifier(), this.getPlugin());
-    }
-}

eco-api/src/main/java/com/willfp/eco/core/integrations/placeholder/PlaceholderManager.java

@@ -1,18 +1,21 @@
 package com.willfp.eco.core.integrations.placeholder;
 
+import com.github.benmanes.caffeine.cache.Cache;
 import com.github.benmanes.caffeine.cache.Caffeine;
 import com.github.benmanes.caffeine.cache.LoadingCache;
-import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.placeholder.AdditionalPlayer;
+import com.willfp.eco.core.placeholder.DynamicPlaceholder;
 import com.willfp.eco.core.placeholder.InjectablePlaceholder;
 import com.willfp.eco.core.placeholder.Placeholder;
 import com.willfp.eco.core.placeholder.PlaceholderInjectable;
+import com.willfp.eco.core.placeholder.PlayerDynamicPlaceholder;
 import com.willfp.eco.core.placeholder.PlayerPlaceholder;
 import com.willfp.eco.core.placeholder.PlayerStaticPlaceholder;
 import com.willfp.eco.core.placeholder.PlayerlessPlaceholder;
 import com.willfp.eco.core.placeholder.StaticPlaceholder;
 import com.willfp.eco.util.StringUtils;
+import org.apache.commons.lang.Validate;
 import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -24,6 +27,7 @@ import java.util.HashMap;
 import java.util.HashSet;
 import java.util.List;
 import java.util.Map;
+import java.util.Optional;
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
 import java.util.regex.Matcher;
@@ -32,18 +36,24 @@ import java.util.regex.Pattern;
 /**
  * Class to handle placeholder integrations.
  */
-@SuppressWarnings("removal")
 public final class PlaceholderManager {
     /**
      * All registered placeholders.
      */
-    private static final Map<EcoPlugin, Map<String, Placeholder>> REGISTERED_PLACEHOLDERS = new HashMap<>();
+    private static final Map<EcoPlugin, Map<Pattern, Placeholder>> REGISTERED_PLACEHOLDERS = new HashMap<>();
 
     /**
      * All registered placeholder integrations.
      */
     private static final Set<PlaceholderIntegration> REGISTERED_INTEGRATIONS = new HashSet<>();
 
+    /**
+     * Placeholder Lookup Cache.
+     */
+    private static final Cache<PlaceholderLookup, Optional<Placeholder>> PLACEHOLDER_LOOKUP_CACHE = Caffeine.newBuilder()
+            .expireAfterWrite(1, TimeUnit.SECONDS)
+            .build();
+
     /**
      * Placeholder Cache.
      */
@@ -51,15 +61,27 @@ public final class PlaceholderManager {
             .expireAfterWrite(50, TimeUnit.MILLISECONDS)
             .build(key -> key.entry.getValue(key.player));
 
+    /**
+     * Dynamic Placeholder Cache.
+     */
+    private static final LoadingCache<DynamicEntryWithPlayer, String> DYNAMIC_PLACEHOLDER_CACHE = Caffeine.newBuilder()
+            .expireAfterWrite(50, TimeUnit.MILLISECONDS)
+            .build(key -> key.entry.getValue(key.args, key.player));
+
     /**
      * The default PlaceholderAPI pattern; brought in for compatibility.
      */
-    private static final Pattern PATTERN = Pattern.compile("[%]([^% ]+)[%]");
+    private static final Pattern PATTERN = Pattern.compile("%([^% ]+)%");
 
     /**
      * Empty injectable object.
      */
     public static final PlaceholderInjectable EMPTY_INJECTABLE = new PlaceholderInjectable() {
+        @Override
+        public void addInjectablePlaceholder(@NotNull Iterable<InjectablePlaceholder> placeholders) {
+            // Do nothing.
+        }
+
         @Override
         public void clearInjectedPlaceholders() {
             // Do nothing.
@@ -88,26 +110,16 @@ public final class PlaceholderManager {
      * @param placeholder The placeholder to register.
      */
     public static void registerPlaceholder(@NotNull final Placeholder placeholder) {
-        if (placeholder instanceof StaticPlaceholder) {
+        if (placeholder instanceof StaticPlaceholder || placeholder instanceof PlayerStaticPlaceholder) {
             throw new IllegalArgumentException("Static placeholders cannot be registered!");
         }
 
-        EcoPlugin plugin = placeholder.getPlugin() == null ? Eco.get().getEcoPlugin() : placeholder.getPlugin();
+        Map<Pattern, Placeholder> pluginPlaceholders = REGISTERED_PLACEHOLDERS
-        Map<String, Placeholder> pluginPlaceholders = REGISTERED_PLACEHOLDERS
+                .getOrDefault(placeholder.getPlugin(), new HashMap<>());
-                .getOrDefault(plugin, new HashMap<>());
-        pluginPlaceholders.put(placeholder.getIdentifier(), placeholder);
-        REGISTERED_PLACEHOLDERS.put(plugin, pluginPlaceholders);
-    }
 
-    /**
+        pluginPlaceholders.put(placeholder.getPattern(), placeholder);
-     * Register a placeholder.
+
-     *
+        REGISTERED_PLACEHOLDERS.put(placeholder.getPlugin(), pluginPlaceholders);
-     * @param placeholder The placeholder to register.
-     * @deprecated Uses old placeholder system.
-     */
-    @Deprecated(since = "6.28.0", forRemoval = true)
-    public static void registerPlaceholder(@NotNull final PlaceholderEntry placeholder) {
-        registerPlaceholder(placeholder.toModernPlaceholder());
     }
 
     /**
@@ -118,10 +130,11 @@ public final class PlaceholderManager {
      * @return The value of the placeholder.
      * @deprecated Specify a plugin to get the result from.
      */
-    @Deprecated
+    @Deprecated(since = "6.52.2", forRemoval = true)
+    @SuppressWarnings("unused")
     public static String getResult(@Nullable final Player player,
                                    @NotNull final String identifier) {
-        return getResult(player, identifier, null);
+        throw new UnsupportedOperationException("Please specify a plugin to get the result from!");
     }
 
     /**
@@ -135,22 +148,35 @@ public final class PlaceholderManager {
     @NotNull
     public static String getResult(@Nullable final Player player,
                                    @NotNull final String identifier,
-                                   @Nullable final EcoPlugin plugin) {
+                                   @NotNull final EcoPlugin plugin) {
-        EcoPlugin owner = plugin == null ? Eco.get().getEcoPlugin() : plugin;
+        Validate.notNull(plugin, "Plugin cannot be null!");
-        Placeholder placeholder = REGISTERED_PLACEHOLDERS.getOrDefault(owner, new HashMap<>()).get(identifier.toLowerCase());
 
-        if (placeholder == null && plugin != null) {
+        // This is really janky, and it sucks, but it works so?
-            Placeholder alternate = REGISTERED_PLACEHOLDERS.getOrDefault(Eco.get().getEcoPlugin(), new HashMap<>())
+        // Compensating for regex being slow so that's why we get it.
-                    .get(identifier.toLowerCase());
+        Placeholder placeholder = PLACEHOLDER_LOOKUP_CACHE.get(
-            if (alternate != null) {
+                new PlaceholderLookup(identifier, plugin),
-                placeholder = alternate;
+                (it) -> {
-            }
+                    // I hate the streams API.
+                    return REGISTERED_PLACEHOLDERS
+                            .getOrDefault(plugin, new HashMap<>())
+                            .entrySet()
+                            .stream().filter(entry -> entry.getKey().matcher(identifier).matches())
+                            .map(Map.Entry::getValue)
+                            .findFirst();
                 }
+        ).orElse(null);
 
         if (placeholder == null) {
             return "";
         }
 
+        /*
+        This code here is *really* not very good. It's mega externalized logic hacked
+        together and made worse by the addition of dynamic placeholders. But it works,
+        and it means I don't have to rewrite the whole placeholder system. So it's
+        good enough for me.
+         */
+
         if (placeholder instanceof PlayerPlaceholder playerPlaceholder) {
             if (player == null) {
                 return "";
@@ -159,6 +185,14 @@ public final class PlaceholderManager {
             }
         } else if (placeholder instanceof PlayerlessPlaceholder playerlessPlaceholder) {
             return playerlessPlaceholder.getValue();
+        } else if (placeholder instanceof PlayerDynamicPlaceholder playerDynamicPlaceholder) {
+            if (player == null) {
+                return "";
+            } else {
+                return DYNAMIC_PLACEHOLDER_CACHE.get(new DynamicEntryWithPlayer(playerDynamicPlaceholder, identifier, player));
+            }
+        } else if (placeholder instanceof DynamicPlaceholder dynamicPlaceholder) {
+            return dynamicPlaceholder.getValue(identifier);
         } else {
             return "";
         }
@@ -176,22 +210,6 @@ public final class PlaceholderManager {
         return translatePlaceholders(text, player, EMPTY_INJECTABLE);
     }
 
-    /**
-     * Translate all placeholders with respect to a player.
-     *
-     * @param text    The text that may contain placeholders to translate.
-     * @param player  The player to translate the placeholders with respect to.
-     * @param statics Extra static placeholders.
-     * @return The text, translated.
-     * @deprecated Use new static system.
-     */
-    @Deprecated(since = "6.35.0", forRemoval = true)
-    public static String translatePlaceholders(@NotNull final String text,
-                                               @Nullable final Player player,
-                                               @NotNull final List<StaticPlaceholder> statics) {
-        return translatePlaceholders(text, player, EMPTY_INJECTABLE);
-    }
-
     /**
      * Translate all placeholders with respect to a player.
      *
@@ -221,6 +239,35 @@ public final class PlaceholderManager {
                                                @NotNull final Collection<AdditionalPlayer> additionalPlayers) {
         String processed = text;
 
+        /*
+
+        Why am I doing statics at the start, but player statics at the end?
+
+        Additional players let you use something like victim as a player to parse in relation to,
+        for example doing %victim_player_health%, which would parse the health of the victim.
+
+        However, something like libreforge will also inject %victim_max_health%, which is unrelated
+        to additional players, and instead holds a constant value. So, eco saw this, smartly thought
+        "ah, it's an additional player, let's parse it", and then tried to parse %max_health% with
+        relation to the victim, which resolved to zero. So, we have to parse statics and player statics
+        that might include a prefix first, then additional players, then player statics with the support
+        of additional players.
+
+        This was a massive headache and took so many reports before I clocked what was going on.
+
+        Oh well, at least it's fixed now.
+
+         */
+
+
+        for (InjectablePlaceholder injection : context.getPlaceholderInjections()) {
+            if (injection instanceof StaticPlaceholder placeholder) {
+                processed = processed.replace("%" + placeholder.getIdentifier() + "%", placeholder.getValue());
+            } else if (injection instanceof PlayerStaticPlaceholder placeholder && player != null) {
+                processed = processed.replace("%" + placeholder.getIdentifier() + "%", placeholder.getValue(player));
+            }
+        }
+
         // Prevent running 2 scans if there are no additional players.
         if (!additionalPlayers.isEmpty()) {
             List<String> found = findPlaceholdersIn(text);
@@ -242,17 +289,23 @@ public final class PlaceholderManager {
             }
         }
 
+        // Only run jank code if there are no integrations.
+        if (REGISTERED_INTEGRATIONS.isEmpty()) {
+            processed = setWithoutIntegration(processed, player);
+        }
+
         for (PlaceholderIntegration integration : REGISTERED_INTEGRATIONS) {
             processed = integration.translate(processed, player);
         }
+
+        // DON'T REMOVE THIS, IT'S NOT DUPLICATE CODE.
         for (InjectablePlaceholder injection : context.getPlaceholderInjections()) {
             // Do I know this is a bad way of doing this? Yes.
-            if (injection instanceof StaticPlaceholder placeholder) {
+            if (injection instanceof PlayerStaticPlaceholder placeholder && player != null) {
-                processed = processed.replace("%" + placeholder.getIdentifier() + "%", placeholder.getValue());
-            } else if (injection instanceof PlayerStaticPlaceholder placeholder && player != null) {
                 processed = processed.replace("%" + placeholder.getIdentifier() + "%", placeholder.getValue(player));
             }
         }
+
         return processed;
     }
 
@@ -265,13 +318,10 @@ public final class PlaceholderManager {
     public static List<String> findPlaceholdersIn(@NotNull final String text) {
         Set<String> found = new HashSet<>();
 
-        // Mock PAPI for those without it installed
-        if (REGISTERED_INTEGRATIONS.isEmpty()) {
         Matcher matcher = PATTERN.matcher(text);
         while (matcher.find()) {
             found.add(matcher.group());
         }
-        }
 
         for (PlaceholderIntegration integration : REGISTERED_INTEGRATIONS) {
             found.addAll(integration.findPlaceholdersIn(text));
@@ -280,11 +330,111 @@ public final class PlaceholderManager {
         return new ArrayList<>(found);
     }
 
+    /**
+     * Set placeholders without any integrations.
+     * <p>
+     * This is fallback if for some reason you don't have PAPI installed.
+     * It's a cut-down version of the actual PAPI code, and I don't
+     * really know how it works.
+     * <p>
+     * Original source
+     * <a href="https://github.com/PlaceholderAPI/PlaceholderAPI/blob/master/src/main/java/me/clip/placeholderapi/replacer/CharsReplacer.java">here</a>.
+     *
+     * @param text   The text.
+     * @param player The player.
+     * @return The text.
+     */
+    private static String setWithoutIntegration(@NotNull final String text,
+                                                @Nullable final Player player) {
+        char[] chars = text.toCharArray();
+        StringBuilder builder = new StringBuilder(text.length());
+        StringBuilder identifier = new StringBuilder();
+        StringBuilder parameters = new StringBuilder();
+
+        for (int i = 0; i < chars.length; i++) {
+            char currentChar = chars[i];
+            if (currentChar == '%' && i + 1 < chars.length) {
+                boolean identified = false;
+                boolean badPlaceholder = true;
+                boolean hadSpace = false;
+
+                while (true) {
+                    i++;
+                    if (i >= chars.length) {
+                        break;
+                    }
+
+                    char p = chars[i];
+                    if (p == ' ' && !identified) {
+                        hadSpace = true;
+                        break;
+                    }
+
+                    if (p == '%') {
+                        badPlaceholder = false;
+                        break;
+                    }
+
+                    if (p == '_' && !identified) {
+                        identified = true;
+                    } else if (identified) {
+                        parameters.append(p);
+                    } else {
+                        identifier.append(p);
+                    }
+                }
+
+                String pluginName = identifier.toString().toLowerCase();
+                EcoPlugin plugin = EcoPlugin.getPlugin(pluginName);
+                String placeholderIdentifier = parameters.toString();
+                identifier.setLength(0);
+                parameters.setLength(0);
+                if (badPlaceholder) {
+                    builder.append('%').append(pluginName);
+                    if (identified) {
+                        builder.append('_').append(placeholderIdentifier);
+                    }
+
+                    if (hadSpace) {
+                        builder.append(' ');
+                    }
+                } else {
+                    if (plugin == null) {
+                        builder.append('%').append(pluginName);
+
+                        if (identified) {
+                            builder.append('_');
+                        }
+
+                        builder.append(placeholderIdentifier).append('%');
+                    } else {
+                        builder.append(getResult(player, placeholderIdentifier, plugin));
+                    }
+                }
+            } else {
+                builder.append(currentChar);
+            }
+        }
+
+        return builder.toString();
+    }
+
+    private record PlaceholderLookup(@NotNull String identifier,
+                                     @Nullable EcoPlugin plugin) {
+
+    }
+
     private record EntryWithPlayer(@NotNull PlayerPlaceholder entry,
                                    @NotNull Player player) {
 
     }
 
+    private record DynamicEntryWithPlayer(@NotNull PlayerDynamicPlaceholder entry,
+                                          @NotNull String args,
+                                          @NotNull Player player) {
+
+    }
+
     private PlaceholderManager() {
         throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
     }

eco-api/src/main/java/com/willfp/eco/core/integrations/shop/ShopManager.java

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.integrations.shop;
 
+import com.willfp.eco.core.integrations.IntegrationRegistry;
 import com.willfp.eco.core.price.Price;
 import com.willfp.eco.core.price.impl.PriceFree;
 import org.bukkit.entity.Player;
@@ -13,11 +14,12 @@ import java.util.Set;
 /**
  * Class to handle shop integrations.
  */
+@SuppressWarnings("DeprecatedIsStillUsed")
 public final class ShopManager {
     /**
      * A set of all registered integrations.
      */
-    private static final Set<ShopIntegration> REGISTERED = new HashSet<>();
+    private static final IntegrationRegistry<ShopIntegration> REGISTRY = new IntegrationRegistry<>();
 
     /**
      * Register a new integration.
@@ -25,17 +27,14 @@ public final class ShopManager {
      * @param integration The integration to register.
      */
     public static void register(@NotNull final ShopIntegration integration) {
-        REGISTERED.removeIf(it -> it.getPluginName().equalsIgnoreCase(integration.getPluginName()));
+        REGISTRY.register(integration);
-        REGISTERED.add(integration);
     }
 
     /**
      * Register eco item provider for shop plugins.
      */
     public static void registerEcoProvider() {
-        for (ShopIntegration shopIntegration : REGISTERED) {
+        REGISTRY.forEachSafely(ShopIntegration::registerEcoProvider);
-            shopIntegration.registerEcoProvider();
-        }
     }
 
     /**
@@ -51,11 +50,7 @@ public final class ShopManager {
             return false;
         }
 
-        for (ShopIntegration integration : REGISTERED) {
+        return REGISTRY.anySafely(integration -> integration.isSellable(itemStack, player));
-            return integration.isSellable(itemStack, player);
-        }
-
-        return false;
     }
 
     /**
@@ -74,11 +69,10 @@ public final class ShopManager {
             return new PriceFree();
         }
 
-        for (ShopIntegration integration : REGISTERED) {
+        return REGISTRY.firstSafely(
-            return integration.getUnitValue(itemStack, player);
+                integration -> integration.getUnitValue(itemStack, player),
-        }
+                new PriceFree()
-
+        );
-        return new PriceFree();
     }
 
     /**
@@ -108,11 +102,10 @@ public final class ShopManager {
             return 0.0;
         }
 
-        for (ShopIntegration shopIntegration : REGISTERED) {
+        return REGISTRY.firstSafely(
-            return shopIntegration.getUnitValue(itemStack, player).getValue(player, itemStack.getAmount());
+                integration -> integration.getUnitValue(itemStack, player).getValue(player, itemStack.getAmount()),
-        }
+                0.0
-
+        );
-        return 0.0;
     }
 
     /**
@@ -121,7 +114,7 @@ public final class ShopManager {
      * @return The integrations.
      */
     public static Set<ShopIntegration> getRegisteredIntegrations() {
-        return new HashSet<>(REGISTERED);
+        return new HashSet<>(REGISTRY.values());
     }
 
     private ShopManager() {

eco-api/src/main/java/com/willfp/eco/core/integrations/shop/ShopWrapper.java

@@ -1,11 +0,0 @@
-package com.willfp.eco.core.integrations.shop;
-
-/**
- * Wrapper class for shop integrations.
- *
- * @deprecated Use ShopIntegration instead.
- */
-@Deprecated(since = "6.35.0", forRemoval = true)
-public interface ShopWrapper extends ShopIntegration {
-
-}

eco-api/src/main/java/com/willfp/eco/core/items/Items.java

@@ -568,6 +568,42 @@ public final class Items {
         return EMPTY_TESTABLE_ITEM.matches(itemStack);
     }
 
+    /**
+     * Get if an item matches any items.
+     *
+     * @param itemStack The item.
+     * @param items     The items.
+     * @return If matches any.
+     */
+    public static boolean matchesAny(@Nullable final ItemStack itemStack,
+                                     @NotNull final Collection<TestableItem> items) {
+        for (TestableItem item : items) {
+            if (item.matches(itemStack)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Get if any item matches any item.
+     *
+     * @param itemStacks The items.
+     * @param items      The items.
+     * @return If matches any.
+     */
+    public static boolean matchesAny(@NotNull final Collection<ItemStack> itemStacks,
+                                     @NotNull final Collection<TestableItem> items) {
+        for (ItemStack itemStack : itemStacks) {
+            if (matchesAny(itemStack, items)) {
+                return true;
+            }
+        }
+
+        return false;
+    }
+
     private Items() {
         throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
     }

eco-api/src/main/java/com/willfp/eco/core/map/DefaultMap.java

@@ -0,0 +1,168 @@
+package com.willfp.eco.core.map;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.Collection;
+import java.util.HashMap;
+import java.util.Map;
+import java.util.Set;
+import java.util.function.Supplier;
+
+/**
+ * A map with a default value.
+ *
+ * @param <K> The key type.
+ * @param <V> The value type.
+ */
+public class DefaultMap<K, V> implements Map<K, V> {
+    /**
+     * The map.
+     */
+    private final Map<K, V> map;
+
+    /**
+     * The default value.
+     */
+    private final Supplier<V> defaultValue;
+
+    /**
+     * Create a new default map.
+     *
+     * @param defaultValue The default value.
+     */
+    public DefaultMap(@NotNull final V defaultValue) {
+        this(() -> defaultValue);
+    }
+
+    /**
+     * Create a new default map.
+     *
+     * @param defaultValue The default value.
+     */
+    public DefaultMap(@NotNull final Supplier<V> defaultValue) {
+        this(new HashMap<>(), defaultValue);
+    }
+
+    /**
+     * Create a new default map.
+     *
+     * @param map          The map.
+     * @param defaultValue The default value.
+     */
+    public DefaultMap(@NotNull final Map<K, V> map,
+                      @NotNull final V defaultValue) {
+        this(map, () -> defaultValue);
+    }
+
+    /**
+     * Create a new default map.
+     *
+     * @param map          The map.
+     * @param defaultValue The default value.
+     */
+    public DefaultMap(@NotNull final Map<K, V> map,
+                      @NotNull final Supplier<V> defaultValue) {
+        this.map = map;
+        this.defaultValue = defaultValue;
+    }
+
+    @Override
+    @NotNull
+    @SuppressWarnings("unchecked")
+    public V get(@Nullable final Object key) {
+        if (key == null) {
+            return defaultValue.get();
+        }
+
+        if (map.get(key) == null) {
+            map.put((K) key, defaultValue.get());
+        }
+
+        return map.get(key);
+    }
+
+    @Override
+    public int size() {
+        return map.size();
+    }
+
+    @Override
+    public boolean isEmpty() {
+        return map.isEmpty();
+    }
+
+    @Override
+    public boolean containsKey(@Nullable final Object key) {
+        return map.containsKey(key);
+    }
+
+    @Override
+    public boolean containsValue(@Nullable final Object value) {
+        return map.containsValue(value);
+    }
+
+    @Override
+    public V put(@NotNull final K key, @Nullable final V value) {
+        return map.put(key, value);
+    }
+
+    @Override
+    public V remove(@NotNull final Object key) {
+        return map.remove(key);
+    }
+
+    @Override
+    public void putAll(@NotNull final Map<? extends K, ? extends V> m) {
+        map.putAll(m);
+    }
+
+    @Override
+    public void clear() {
+        map.clear();
+    }
+
+    @NotNull
+    @Override
+    public Set<K> keySet() {
+        return map.keySet();
+    }
+
+    @NotNull
+    @Override
+    public Collection<V> values() {
+        return map.values();
+    }
+
+    @NotNull
+    @Override
+    public Set<Entry<K, V>> entrySet() {
+        return map.entrySet();
+    }
+
+    /**
+     * Create a new nested map.
+     *
+     * @param <K>  The key type.
+     * @param <K1> The nested key type.
+     * @param <V>  The value type.
+     * @return The nested map.
+     */
+    @NotNull
+    public static <K, K1, V> DefaultMap<K, Map<K1, V>> createNestedMap() {
+        return new DefaultMap<>(new HashMap<>());
+    }
+
+    /**
+     * Create a new nested list map.
+     *
+     * @param <K>  The key type.
+     * @param <K1> The nested key type.
+     * @param <V>  The value type.
+     * @return The nested list map.
+     */
+    @NotNull
+    public static <K, K1, V> DefaultMap<K, ListMap<K1, V>> createNestedListMap() {
+        return new DefaultMap<>(new ListMap<>());
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/map/ListMap.java

@@ -0,0 +1,32 @@
+package com.willfp.eco.core.map;
+
+import org.jetbrains.annotations.NotNull;
+
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * Maps keys to lists of values.
+ *
+ * @param <K> The key type.
+ * @param <V> The value type.
+ */
+public class ListMap<K, V> extends DefaultMap<K, List<V>> {
+    /**
+     * Create a new list map.
+     */
+    public ListMap() {
+        super(ArrayList::new);
+    }
+
+    /**
+     * Append a value to a key.
+     *
+     * @param key   The key.
+     * @param value The value.
+     */
+    public void append(@NotNull final K key,
+                       @NotNull final V value) {
+        this.get(key).add(value);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/packet/Packet.java

@@ -0,0 +1,21 @@
+package com.willfp.eco.core.packet;
+
+import com.willfp.eco.core.Eco;
+import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Represents a packet.
+ *
+ * @param handle The NMS handle.
+ */
+public record Packet(@NotNull Object handle) {
+    /**
+     * Send to a player.
+     *
+     * @param player The player.
+     */
+    void send(@NotNull final Player player) {
+        Eco.get().sendPacket(player, this);
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/packet/PacketEvent.java

@@ -0,0 +1,67 @@
+package com.willfp.eco.core.packet;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Represents a packet being sent or received.
+ */
+public class PacketEvent implements Cancellable {
+    /**
+     * The packet.
+     */
+    private final Packet packet;
+
+    /**
+     * The player.
+     */
+    private final Player player;
+
+    /**
+     * If the event should be cancelled.
+     */
+    private boolean cancelled = false;
+
+    /**
+     * Create a new packet event.
+     *
+     * @param packet The packet.
+     * @param player The player.
+     */
+    public PacketEvent(@NotNull final Packet packet,
+                       @NotNull final Player player) {
+        this.packet = packet;
+        this.player = player;
+    }
+
+    /**
+     * Get the packet.
+     *
+     * @return The packet.
+     */
+    @NotNull
+    public Packet getPacket() {
+        return packet;
+    }
+
+    /**
+     * Get the player.
+     *
+     * @return The player.
+     */
+    @NotNull
+    public Player getPlayer() {
+        return player;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return cancelled;
+    }
+
+    @Override
+    public void setCancelled(final boolean cancelled) {
+        this.cancelled = cancelled;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/packet/PacketListener.java

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.packet;
+
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Listens to packets.
+ */
+public interface PacketListener {
+    /**
+     * Called when a handle is sent.
+     *
+     * @param event The event.
+     */
+    default void onSend(@NotNull final PacketEvent event) {
+        // Override when needed.
+    }
+
+    /**
+     * Called when a handle is received.
+     *
+     * @param event The event.
+     */
+    default void onReceive(@NotNull final PacketEvent event) {
+        // Override when needed.
+    }
+
+    /**
+     * Get the priority of the listener.
+     *
+     * @return The priority.
+     */
+    default PacketPriority getPriority() {
+        return PacketPriority.NORMAL;
+    }
+}

eco-api/src/main/java/com/willfp/eco/core/packet/PacketPriority.java

@@ -0,0 +1,31 @@
+package com.willfp.eco.core.packet;
+
+/**
+ * The priority (order) of packet listeners.
+ */
+public enum PacketPriority {
+    /**
+     * Ran first.
+     */
+    LOWEST,
+
+    /**
+     * Ran second.
+     */
+    LOW,
+
+    /**
+     * Ran third.
+     */
+    NORMAL,
+
+    /**
+     * Ran fourth.
+     */
+    HIGH,
+
+    /**
+     * Ran last.
+     */
+    HIGHEST
+}