Fixed config.yml bug

# Conflicts:
#	build.gradle.kts

.github/workflows/java-ci.yml

@@ -14,11 +14,11 @@ jobs:
         id: vars
         run: echo "::set-output name=sha_short::$(git rev-parse --short HEAD)"
 
-      - name: Set up JDK 16
+      - name: Set up JDK 17
         uses: actions/setup-java@v2
         with:
-          distribution: 'adopt'
-          java-version: 16
+          distribution: 'temurin'
+          java-version: 17
 
       - name: Setup build cache
         uses: actions/cache@v2.1.6
@@ -28,7 +28,7 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-gradle-
 
-      - run: ./gradlew build
+      - run: ./gradlew build --full-stacktrace
 
       - uses: actions/upload-artifact@v2
         with:

.github/workflows/publish-release.yml

@@ -12,11 +12,11 @@ jobs:
       - name: Checkout latest code
         uses: actions/checkout@v2
 
-      - name: Set up JDK 16
+      - name: Set up JDK 17
         uses: actions/setup-java@v2
         with:
-          distribution: 'adopt'
-          java-version: 16
+          distribution: 'temurin'
+          java-version: 17
 
       - name: Setup build cache
         uses: actions/cache@v2.1.6

CONTRIBUTING.md

@@ -21,4 +21,4 @@
 
 ## Other
 - All drops **must** be sent through a DropQueue - calls to World#dropItem will get your PR rejected.
-- eco is built with java 16.
+- eco is built with java 17.

build.gradle.kts

@@ -1,6 +1,6 @@
 plugins {
     id("java-library")
-    id("com.github.johnrengelman.shadow") version "7.0.0"
+    id("com.github.johnrengelman.shadow") version "7.1.0"
     id("maven-publish")
     id("java")
 }
@@ -12,6 +12,7 @@ dependencies {
     implementation(project(":eco-core:core-backend"))
     implementation(project(":eco-core:core-nms:v1_16_R3"))
     implementation(project(path = ":eco-core:core-nms:v1_17_R1", configuration = "reobf"))
+    implementation(project(":eco-core:core-nms:v1_18_R1"))
 }
 
 allprojects {
@@ -25,13 +26,16 @@ allprojects {
         mavenLocal()
         maven("https://jitpack.io")
 
+        // CustomCrafting
+        maven("https://maven.wolfyscript.com/repository/public/")
+
         // SuperiorSkyblock2
         maven("https://repo.bg-software.com/repository/api/")
 
         // NMS (for jitpack compilation)
         maven("https://repo.codemc.org/repository/nms/")
 
-        // bStats, mcMMO, BentoBox
+        // mcMMO, BentoBox
         maven("https://repo.codemc.org/repository/maven-public/")
 
         // Spigot API, Bungee API
@@ -64,7 +68,12 @@ allprojects {
 
         // Test
         testImplementation("org.junit.jupiter:junit-jupiter-api:5.8.1")
-        testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.8.1")
+        testRuntimeOnly("org.junit.jupiter:junit-jupiter-engine:5.8.2")
+        
+        // Adventure
+        compileOnly("net.kyori:adventure-api:4.9.3")
+        compileOnly("net.kyori:adventure-text-serializer-gson:4.9.3")
+        compileOnly("net.kyori:adventure-text-serializer-legacy:4.9.3")
     }
 
     tasks.withType<JavaCompile> {
@@ -93,8 +102,8 @@ allprojects {
         }
 
         java {
-            sourceCompatibility = JavaVersion.VERSION_16
-            targetCompatibility = JavaVersion.VERSION_16
+            sourceCompatibility = JavaVersion.VERSION_17
+            targetCompatibility = JavaVersion.VERSION_17
             withSourcesJar()
         }
 

eco-api/build.gradle

@@ -9,9 +9,6 @@ dependencies {
     // Adventure
     compileOnly 'net.kyori:adventure-platform-bukkit:4.0.0'
     compileOnly 'net.kyori:adventure-text-minimessage:4.1.0-SNAPSHOT'
-    compileOnly 'net.kyori:adventure-api:4.9.2'
-    compileOnly 'net.kyori:adventure-text-serializer-gson:4.9.2'
-    compileOnly 'net.kyori:adventure-text-serializer-legacy:4.9.2'
 
     // Other
     compileOnly 'org.spigotmc:spigot-api:1.17.1-R0.1-SNAPSHOT'

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

@@ -5,10 +5,13 @@ import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 
 /**
- * Base class to hold the handler.
+ * Holds the instance of the eco handler for bridging between the frontend
+ * and backend.
  *
+ * @see Eco#getHandler()
  * @see Handler
  */
+@ApiStatus.Internal
 public final class Eco {
     /**
      * Instance of eco handler.
@@ -18,6 +21,7 @@ public final class Eco {
 
     /**
      * Set the handler.
+     *
      * @param handler The handler.
      */
     @ApiStatus.Internal
@@ -28,18 +32,18 @@ public final class Eco {
     }
 
     /**
-     * Get the instance of the eco handler.
+     * Get the instance of the eco handler; the bridge between the api frontend
+     * and the implementation backend.
      * <p>
-     * The handler is, in essence, a way to interface between the eco-api
-     * frontend module, and the eco-backend implementations.
+     * <strong>Do not use the handler in your plugins!</strong> It can and will contain
+     * breaking changes between minor versions and even patches, and you will create
+     * compatibility issues by using the handler. All parts of the handler have been abstracted
+     * into logically named API components that you can use.
      * <p>
-     * There shouldn't really be any reason to ever use the handler
-     * in your own plugins, and you are likely to break things. All parts of
-     * the handler are abstracted into logically named parts of the API.
-     * <p>
-     * In versions of eco before 6.12.0, the handler was considered part of
-     * the eco API, however it has since been moved into an internal component
-     * that shouldn't be used in your plugins.
+     * Prior to version 6.12.0, the handler was considered as an API component, but it has
+     * since been moved into an internal component, and in 6.17.0, the first breaking change
+     * was introduced to {@link com.willfp.eco.core.config.wrapper.ConfigFactory}. This means
+     * that any usages of the handler can now cause problems in your plugins.
      *
      * @return The handler.
      */

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

@@ -14,7 +14,6 @@ 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.integrations.placeholder.PlaceholderManager;
-import com.willfp.eco.core.proxy.AbstractProxy;
 import com.willfp.eco.core.proxy.ProxyFactory;
 import com.willfp.eco.core.scheduling.Scheduler;
 import com.willfp.eco.core.web.UpdateChecker;
@@ -32,6 +31,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.HashSet;
 import java.util.List;
+import java.util.Objects;
 import java.util.Set;
 import java.util.logging.Logger;
 import java.util.stream.Collectors;
@@ -636,7 +636,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
      * @param <T>        The proxy type.
      * @return The proxy.
      */
-    public final <T extends AbstractProxy> T getProxy(@NotNull final Class<T> proxyClass) {
+    public final <T> T getProxy(@NotNull final Class<T> proxyClass) {
         Validate.notNull(proxyFactory, "Plugin does not support proxy!");
 
         return proxyFactory.getProxy(proxyClass);
@@ -655,7 +655,7 @@ public abstract class EcoPlugin extends JavaPlugin implements PluginLike {
     public final FileConfiguration getConfig() {
         this.getLogger().warning("Call to default config method in eco plugin!");
 
-        return this.getConfigYml().getBukkitHandle();
+        return Objects.requireNonNull(this.getConfigYml().getBukkitHandle());
     }
 
     /**

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

@@ -230,5 +230,6 @@ public interface Handler {
      *
      * @return The handler.
      */
+    @NotNull
     PlayerProfileHandler getPlayerProfileHandler();
 }

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

@@ -4,6 +4,13 @@ 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.
  */

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

@@ -3,6 +3,7 @@ package com.willfp.eco.core;
 import com.willfp.eco.core.config.updating.ConfigHandler;
 
 import java.io.File;
+import java.util.logging.Logger;
 
 /**
  * Represents any class that acts like a plugin, for example {@link EcoPlugin}
@@ -26,4 +27,11 @@ public interface PluginLike {
      * @return The config handler.
      */
     ConfigHandler getConfigHandler();
+
+    /**
+     * Get the logger.
+     *
+     * @return The logger.
+     */
+    Logger getLogger();
 }

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

@@ -41,11 +41,19 @@ public class Prerequisite {
             "Requires server to have vault"
     );
 
+    /**
+     * Requires the server to be running 1.18.
+     */
+    public static final Prerequisite HAS_1_18 = new Prerequisite(
+            () -> ProxyConstants.NMS_VERSION.contains("18"),
+            "Requires server to be running 1.18+"
+    );
+
     /**
      * Requires the server to be running 1.17.
      */
     public static final Prerequisite HAS_1_17 = new Prerequisite(
-            () -> ProxyConstants.NMS_VERSION.contains("17"),
+            () -> ProxyConstants.NMS_VERSION.contains("17") || HAS_1_18.isMet(),
             "Requires server to be running 1.17+"
     );
 

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

@@ -1,7 +1,11 @@
 package com.willfp.eco.core.command;
 
+import org.bukkit.command.CommandSender;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.ArrayList;
+import java.util.List;
+
 /**
  * Interface for all command implementations.
  */
@@ -35,31 +39,70 @@ public interface CommandBase {
      */
     CommandBase addSubcommand(@NotNull CommandBase command);
 
+    /**
+     * Handle command execution.
+     * <p>
+     * Marked as default void with no implementation for backwards compatibility.
+     *
+     * @param sender The sender.
+     * @param args   The args.
+     */
+    default void onExecute(@NotNull CommandSender sender,
+                           @NotNull List<String> args) {
+        // Do nothing.
+    }
+
+    /**
+     * Handle tab completion.
+     * <p>
+     * Marked as default void with no implementation for backwards compatibility.
+     *
+     * @param sender The sender.
+     * @param args   The args.
+     * @return The results.
+     */
+    default List<String> tabComplete(@NotNull CommandSender sender,
+                                     @NotNull List<String> args) {
+        return new ArrayList<>();
+    }
+
     /**
      * Get the handler.
      *
      * @return The handler.
+     * @see CommandHandler
+     * @deprecated Use {@link CommandBase#onExecute(CommandSender, List)} instead.
      */
+    @Deprecated
     CommandHandler getHandler();
 
     /**
      * Set the handler.
      *
      * @param handler The handler.
+     * @see CommandHandler
+     * @deprecated Handlers have been deprecated.
      */
+    @Deprecated
     void setHandler(@NotNull CommandHandler handler);
 
     /**
      * Get the tab completer.
      *
      * @return The tab completer.
+     * @see TabCompleteHandler
+     * @deprecated Use {@link CommandBase#tabComplete(CommandSender, List)} instead.
      */
+    @Deprecated
     TabCompleteHandler getTabCompleter();
 
     /**
      * Set the tab completer.
      *
      * @param handler The handler.
+     * @see TabCompleteHandler
+     * @deprecated Handlers have been deprecated.
      */
+    @Deprecated
     void setTabCompleter(@NotNull TabCompleteHandler handler);
 }

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

@@ -10,9 +10,13 @@ import java.util.List;
  * A command handler handles the actual code for a command.
  * <p>
  * The replacement for {@link org.bukkit.command.CommandExecutor#onCommand(CommandSender, Command, String, String[])}
+ *
  * @see CommandBase
+ * @deprecated Handlers have been deprecated. This legacy system will eventually be removed,
+ * update to use the new system: {@link CommandBase#onExecute(CommandSender, List)}.
  */
 @FunctionalInterface
+@Deprecated(since = "6.17.0")
 public interface CommandHandler {
     /**
      * The code to be called on execution.

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

@@ -10,9 +10,13 @@ import java.util.List;
  * A Tab Complete handler handles the actual tab-completion code.
  * <p>
  * The replacement for {@link org.bukkit.command.TabCompleter#onTabComplete(CommandSender, Command, String, String[])}
+ *
  * @see CommandBase
+ * @deprecated Handlers have been deprecated. This legacy system will eventually be removed,
+ * update to use the new system: {@link CommandBase#tabComplete(CommandSender, List)}
  */
 @FunctionalInterface
+@Deprecated(since = "6.17.0")
 public interface TabCompleteHandler {
     /**
      * Handle Tab Completion.

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

@@ -9,6 +9,7 @@ import org.bukkit.command.CommandSender;
 import org.bukkit.entity.Player;
 import org.bukkit.util.StringUtil;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -23,6 +24,7 @@ import java.util.stream.Collectors;
  * in order to execute the command-specific code. It's essentially an internal
  * layer, hence why it's a package-private class.
  */
+@SuppressWarnings({"DeprecatedIsStillUsed"})
 abstract class HandledCommand extends PluginDependent<EcoPlugin> implements CommandBase {
     /**
      * The name of the command.
@@ -46,14 +48,16 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
     /**
      * The actual code to be executed in the command.
      */
-    private CommandHandler handler = (sender, args) -> {
-        // Do nothing by default
-    };
+    @Deprecated
+    @Nullable
+    private CommandHandler handler = null;
 
     /**
      * The tab completion code to be executed in the command.
      */
-    private TabCompleteHandler tabCompleter = (sender, args) -> new ArrayList<>();
+    @Deprecated
+    @Nullable
+    private TabCompleteHandler tabCompleter = null;
 
     /**
      * All subcommands for the command.
@@ -120,7 +124,11 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
             }
         }
 
-        this.getHandler().onExecute(sender, Arrays.asList(args));
+        if (this.getHandler() != null) {
+            this.getHandler().onExecute(sender, Arrays.asList(args));
+        } else {
+            this.onExecute(sender, Arrays.asList(args));
+        }
     }
 
     /**
@@ -167,7 +175,11 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
             }
         }
 
-        return this.getTabCompleter().tabComplete(sender, Arrays.asList(args));
+        if (this.getTabCompleter() != null) {
+            return this.getTabCompleter().tabComplete(sender, Arrays.asList(args));
+        } else {
+            return this.tabComplete(sender, Arrays.asList(args));
+        }
     }
 
     /**
@@ -221,24 +233,6 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
         return this.playersOnly;
     }
 
-    /**
-     * Get the actual code to be executed in the command.
-     *
-     * @return The code.
-     */
-    public CommandHandler getHandler() {
-        return this.handler;
-    }
-
-    /**
-     * Get the tab completion code to be executed in the command.
-     *
-     * @return The code.
-     */
-    public TabCompleteHandler getTabCompleter() {
-        return this.tabCompleter;
-    }
-
     /**
      * Get the subcommands of the command.
      *
@@ -248,21 +242,27 @@ abstract class HandledCommand extends PluginDependent<EcoPlugin> implements Comm
         return this.subcommands;
     }
 
-    /**
-     * Set the command handler.
-     *
-     * @param handler The handler.
-     */
-    public void setHandler(@NotNull final CommandHandler handler) {
+    @Deprecated
+    @Override
+    public @Nullable CommandHandler getHandler() {
+        return this.handler;
+    }
+
+    @Deprecated
+    @Override
+    public @Nullable TabCompleteHandler getTabCompleter() {
+        return this.tabCompleter;
+    }
+
+    @Deprecated
+    @Override
+    public void setHandler(@Nullable final CommandHandler handler) {
         this.handler = handler;
     }
 
-    /**
-     * Set the tab completer.
-     *
-     * @param tabCompleter The tab completer.
-     */
-    public void setTabCompleter(@NotNull final TabCompleteHandler tabCompleter) {
+    @Deprecated
+    @Override
+    public void setTabCompleter(@Nullable final TabCompleteHandler tabCompleter) {
         this.tabCompleter = tabCompleter;
     }
 }

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

@@ -12,7 +12,9 @@ import org.jetbrains.annotations.Nullable;
 import java.util.List;
 
 /**
- * PluginCommands are the class to be used instead of CommandExecutor.
+ * PluginCommands are the class to be used instead of CommandExecutor,
+ * they function as the base command, e.g. {@code /ecoenchants} would be a base command, with each
+ * subsequent argument functioning as subcommands.
  * <p>
  * The command will not be registered until register() is called.
  * <p>

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

@@ -0,0 +1,35 @@
+package com.willfp.eco.core.config;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.wrapper.LoadableConfigWrapper;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
+ * <p>
+ * Automatically updates.
+ */
+public abstract class BaseConfig extends LoadableConfigWrapper {
+    /**
+     * Create new Base Config.
+     *
+     * @param plugin       The plugin or extension.
+     * @param configName   The config name (excluding extension).
+     * @param removeUnused If unused sections should be removed.
+     * @param type         The config type.
+     */
+    protected BaseConfig(@NotNull final String configName,
+                         @NotNull final PluginLike plugin,
+                         final boolean removeUnused,
+                         @NotNull final ConfigType type) {
+        super(Eco.getHandler().getConfigFactory().createUpdatableConfig(
+                configName,
+                plugin,
+                "",
+                plugin.getClass(),
+                removeUnused,
+                type
+        ));
+    }
+}

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

@@ -0,0 +1,16 @@
+package com.willfp.eco.core.config;
+
+/**
+ * Config types, classified by file extension.
+ */
+public enum ConfigType {
+    /**
+     * .json config.
+     */
+    JSON,
+
+    /**
+     * .yml config.
+     */
+    YAML
+}

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

@@ -0,0 +1,44 @@
+package com.willfp.eco.core.config;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.wrapper.LoadableConfigWrapper;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Config implementation for configs present in one of two places:
+ * <ul>
+ *     <li>Plugin base directory (eg config.yml, lang.json)</li>
+ *     <li>Other extension's configs</li>
+ * </ul>
+ * <p>
+ * Automatically updates.
+ */
+public abstract class ExtendableConfig extends LoadableConfigWrapper {
+    /**
+     * @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.
+     * @param updateBlacklist  Substring of keys to not add/remove keys for.
+     * @param subDirectoryPath The subdirectory path.
+     * @param type             The config type.
+     * @param source           The class that owns the resource.
+     */
+    protected ExtendableConfig(@NotNull final String configName,
+                               final boolean removeUnused,
+                               @NotNull final PluginLike plugin,
+                               @NotNull final Class<?> source,
+                               @NotNull final String subDirectoryPath,
+                               @NotNull final ConfigType type,
+                               @NotNull final String... updateBlacklist) {
+        super(Eco.getHandler().getConfigFactory().createUpdatableConfig(
+                configName,
+                plugin,
+                subDirectoryPath,
+                source,
+                removeUnused,
+                type,
+                updateBlacklist
+        ));
+    }
+}

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

@@ -0,0 +1,32 @@
+package com.willfp.eco.core.config;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.wrapper.LoadableConfigWrapper;
+import org.jetbrains.annotations.NotNull;
+
+/**
+ * Non-updatable yaml config that exists within a plugin jar.
+ */
+public abstract class StaticBaseConfig extends LoadableConfigWrapper {
+    /**
+     * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
+     * <p>
+     * Does not automatically update.
+     *
+     * @param configName The name of the config
+     * @param plugin     The plugin.
+     * @param type       The config type.
+     */
+    protected StaticBaseConfig(@NotNull final String configName,
+                               @NotNull final PluginLike plugin,
+                               @NotNull final ConfigType type) {
+        super(Eco.getHandler().getConfigFactory().createLoadableConfig(
+                configName,
+                plugin,
+                "",
+                plugin.getClass(),
+                type
+        ));
+    }
+}

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

@@ -0,0 +1,48 @@
+package com.willfp.eco.core.config;
+
+import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.config.interfaces.Config;
+import com.willfp.eco.core.config.wrapper.ConfigWrapper;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Map;
+
+/**
+ * Config that exists purely in the code, not linked to any file.
+ * <p>
+ * Use for inline configs to move data around or to add subsections to other configs.
+ */
+public class TransientConfig extends ConfigWrapper<Config> {
+    /**
+     * @param config The YamlConfiguration handle.
+     */
+    public TransientConfig(@NotNull final YamlConfiguration config) {
+        super(Eco.getHandler().getConfigFactory().createConfig(config));
+    }
+
+    /**
+     * Create a new empty transient config.
+     *
+     * @param values The values.
+     */
+    public TransientConfig(@NotNull final Map<String, Object> values) {
+        super(Eco.getHandler().getConfigFactory().createConfig(values));
+    }
+
+    /**
+     * Create a new empty transient config.
+     */
+    public TransientConfig() {
+        super(Eco.getHandler().getConfigFactory().createConfig("", ConfigType.YAML));
+    }
+
+    /**
+     * @param contents The contents of the config.
+     * @param type     The config type.
+     */
+    public TransientConfig(@NotNull final String contents,
+                           @NotNull final ConfigType type) {
+        super(Eco.getHandler().getConfigFactory().createConfig(contents, type));
+    }
+}

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

@@ -1,19 +1,55 @@
 package com.willfp.eco.core.config.base;
 
 import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.config.yaml.YamlBaseConfig;
+import com.willfp.eco.core.config.BaseConfig;
+import com.willfp.eco.core.config.ConfigType;
 import org.jetbrains.annotations.NotNull;
 
 /**
  * Default plugin config.yml.
  */
-public class ConfigYml extends YamlBaseConfig {
+public class ConfigYml extends BaseConfig {
     /**
      * Config.yml.
      *
      * @param plugin The plugin.
      */
     public ConfigYml(@NotNull final EcoPlugin plugin) {
-        super("config", true, plugin);
+        super("config", plugin, true, ConfigType.YAML);
+    }
+
+    /**
+     * Config.yml.
+     *
+     * @param plugin       The plugin.
+     * @param removeUnused Remove unused.
+     */
+    public ConfigYml(@NotNull final EcoPlugin plugin,
+                     final boolean removeUnused) {
+        super("config", plugin, removeUnused, ConfigType.YAML);
+    }
+
+    /**
+     * Config.yml.
+     *
+     * @param plugin The plugin.
+     * @param name   The config name.
+     */
+    public ConfigYml(@NotNull final EcoPlugin plugin,
+                     @NotNull final String name) {
+        super(name, plugin, true, ConfigType.YAML);
+    }
+
+    /**
+     * Config.yml.
+     *
+     * @param plugin       The plugin.
+     * @param name         The config name.
+     * @param removeUnused Remove unused.
+     */
+    public ConfigYml(@NotNull final EcoPlugin plugin,
+                     @NotNull final String name,
+                     final boolean removeUnused) {
+        super(name, plugin, removeUnused, ConfigType.YAML);
     }
 }

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

@@ -1,21 +1,22 @@
 package com.willfp.eco.core.config.base;
 
 import com.willfp.eco.core.EcoPlugin;
-import com.willfp.eco.core.config.yaml.YamlBaseConfig;
+import com.willfp.eco.core.config.BaseConfig;
+import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.util.StringUtils;
 import org.jetbrains.annotations.NotNull;
 
 /**
  * Default plugin lang.yml.
  */
-public class LangYml extends YamlBaseConfig {
+public class LangYml extends BaseConfig {
     /**
      * Lang.yml.
      *
      * @param plugin The plugin.
      */
     public LangYml(@NotNull final EcoPlugin plugin) {
-        super("lang", false, plugin);
+        super("lang", plugin, false, ConfigType.YAML);
     }
 
     /**

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

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.config.interfaces;
 
+import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.util.StringUtils;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -7,7 +8,7 @@ import org.jetbrains.annotations.Nullable;
 import java.util.List;
 
 /**
- * All canfigs implement this interface.
+ * All configs implement this interface.
  * <p>
  * Contains all methods that must exist in yaml and json configurations.
  */
@@ -524,6 +525,32 @@ public interface Config extends Cloneable {
     @Nullable
     List<Double> getDoublesOrNull(@NotNull String path);
 
+    /**
+     * Get a list of subsections from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or a blank {@link java.util.ArrayList} if not found.
+     */
+    @NotNull
+    List<? extends Config> getSubsections(@NotNull String path);
+
+    /**
+     * Get a list of subsections from config.
+     *
+     * @param path The key to fetch the value from.
+     * @return The found value, or null if not found.
+     */
+    @Nullable
+    List<? extends Config> getSubsectionsOrNull(@NotNull String path);
+
+    /**
+     * Get config type.
+     *
+     * @return The type.
+     */
+    @NotNull
+    ConfigType getType();
+
     /**
      * Clone the config.
      *

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

@@ -6,10 +6,14 @@ import org.jetbrains.annotations.Nullable;
 import java.util.List;
 
 /**
- * JSON configs have extra methods compared to yaml configs.
- * <p>
- * If you need to use them, then use JSONConfig instead.
+ * JSON config.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
+@SuppressWarnings("DeprecatedIsStillUsed")
 public interface JSONConfig extends Config {
     /**
      * Get a list of subsections from config.

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

@@ -1,12 +1,16 @@
 package com.willfp.eco.core.config.interfaces;
 
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.bukkit.plugin.java.JavaPlugin;
+import org.jetbrains.annotations.Nullable;
+
 import java.io.File;
 import java.io.IOException;
 
 /**
  * Interface for configs that physically exist as files in plugins.
  */
-public interface LoadableConfig {
+public interface LoadableConfig extends Config {
     /**
      * Create the file.
      */
@@ -39,4 +43,18 @@ public interface LoadableConfig {
      * @return The name.
      */
     String getName();
+
+    /**
+     * Get bukkit {@link YamlConfiguration}.
+     * <p>
+     * This method is not recommended unless absolutely required as it
+     * only returns true if the type of config is {@link com.willfp.eco.core.config.ConfigType#YAML},
+     * and if the handle is an {@link YamlConfiguration} specifically. This depends on the internals
+     * and the implementation, and so may cause problems - it exists mostly for parity with
+     * {@link JavaPlugin#getConfig()}.
+     *
+     * @return The config, or null if config is not yaml-based.
+     */
+    @Nullable
+    YamlConfiguration getBukkitHandle();
 }

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

@@ -5,8 +5,12 @@ import org.bukkit.configuration.file.YamlConfiguration;
 /**
  * Interface for configs that wrap an {@link YamlConfiguration}.
  *
- * @see com.willfp.eco.core.config.yaml.wrapper.YamlConfigWrapper
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
+@SuppressWarnings("DeprecatedIsStillUsed")
 public interface WrappedYamlConfiguration {
     /**
      * Get the ConfigurationSection handle.

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

@@ -3,6 +3,8 @@ package com.willfp.eco.core.config.json;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.ConfigType;
+import com.willfp.eco.core.config.interfaces.JSONConfig;
 import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
@@ -10,7 +12,12 @@ import org.jetbrains.annotations.NotNull;
  * Config implementation for configs present in the plugin's base directory (eg config.json).
  * <p>
  * Automatically updates.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class JSONBaseConfig extends LoadableJSONConfigWrapper {
     /**
      * @param configName      The name of the config
@@ -23,13 +30,16 @@ public abstract class JSONBaseConfig extends LoadableJSONConfigWrapper {
                              @NotNull final PluginLike plugin,
                              @NotNull final String... updateBlacklist) {
         super(
-                Eco.getHandler().getConfigFactory().createUpdatableJSONConfig(
-                        configName,
-                        plugin,
-                        "",
-                        plugin.getClass(),
-                        removeUnused, updateBlacklist
-                )
+                (JSONConfig)
+                        Eco.getHandler().getConfigFactory().createUpdatableConfig(
+                                configName,
+                                plugin,
+                                "",
+                                plugin.getClass(),
+                                removeUnused,
+                                ConfigType.JSON,
+                                updateBlacklist
+                        )
         );
     }
 
@@ -42,13 +52,15 @@ public abstract class JSONBaseConfig extends LoadableJSONConfigWrapper {
                              final boolean removeUnused,
                              @NotNull final PluginLike plugin) {
         super(
-                Eco.getHandler().getConfigFactory().createUpdatableJSONConfig(
-                        configName,
-                        plugin,
-                        "",
-                        plugin.getClass(),
-                        removeUnused
-                )
+                (JSONConfig)
+                        Eco.getHandler().getConfigFactory().createUpdatableConfig(
+                                configName,
+                                plugin,
+                                "",
+                                plugin.getClass(),
+                                removeUnused,
+                                ConfigType.JSON
+                        )
         );
     }
 

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

@@ -3,6 +3,8 @@ package com.willfp.eco.core.config.json;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.ConfigType;
+import com.willfp.eco.core.config.interfaces.JSONConfig;
 import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
@@ -14,7 +16,12 @@ import org.jetbrains.annotations.NotNull;
  * </ul>
  * <p>
  * Automatically updates.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class JSONExtendableConfig extends LoadableJSONConfigWrapper {
     /**
      * @param configName       The name of the config
@@ -31,16 +38,19 @@ public abstract class JSONExtendableConfig extends LoadableJSONConfigWrapper {
                                    @NotNull final String subDirectoryPath,
                                    @NotNull final String... updateBlacklist) {
         super(
-                Eco.getHandler().getConfigFactory().createUpdatableJSONConfig(
-                        configName,
-                        plugin,
-                        subDirectoryPath,
-                        source,
-                        removeUnused,
-                        updateBlacklist
-                )
+                (JSONConfig)
+                        Eco.getHandler().getConfigFactory().createUpdatableConfig(
+                                configName,
+                                plugin,
+                                subDirectoryPath,
+                                source,
+                                removeUnused,
+                                ConfigType.JSON,
+                                updateBlacklist
+                        )
         );
     }
+
     /**
      * @param configName       The name of the config
      * @param removeUnused     Whether keys not present in the default config should be removed on update.

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

@@ -3,12 +3,19 @@ package com.willfp.eco.core.config.json;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.ConfigType;
+import com.willfp.eco.core.config.interfaces.JSONConfig;
 import com.willfp.eco.core.config.json.wrapper.LoadableJSONConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
 /**
  * Non-updatable JSON config that exists within a plugin jar.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class JSONStaticBaseConfig extends LoadableJSONConfigWrapper {
     /**
      * Config implementation for configs present in the plugin's base directory (eg config.json, lang.json).
@@ -20,7 +27,7 @@ public abstract class JSONStaticBaseConfig extends LoadableJSONConfigWrapper {
      */
     protected JSONStaticBaseConfig(@NotNull final String configName,
                                    @NotNull final PluginLike plugin) {
-        super(Eco.getHandler().getConfigFactory().createLoadableJSONConfig(configName, plugin, "", plugin.getClass()));
+        super((JSONConfig) Eco.getHandler().getConfigFactory().createLoadableConfig(configName, plugin, "", plugin.getClass(), ConfigType.JSON));
     }
 
     /**

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

@@ -1,14 +1,21 @@
 package com.willfp.eco.core.config.json;
 
 import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.config.interfaces.JSONConfig;
 import com.willfp.eco.core.config.json.wrapper.JSONConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.HashMap;
 import java.util.Map;
 
 /**
  * Raw JSON config with a map of values at its core.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public class JSONTransientConfig extends JSONConfigWrapper {
     /**
      * Config implementation for passing maps.
@@ -18,6 +25,13 @@ public class JSONTransientConfig extends JSONConfigWrapper {
      * @param values The map of values.
      */
     public JSONTransientConfig(@NotNull final Map<String, Object> values) {
-        super(Eco.getHandler().getConfigFactory().createJSONConfig(values));
+        super((JSONConfig) Eco.getHandler().getConfigFactory().createConfig(values));
+    }
+
+    /**
+     * Empty JSON config.
+     */
+    public JSONTransientConfig() {
+        super((JSONConfig) Eco.getHandler().getConfigFactory().createConfig(new HashMap<>()));
     }
 }

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

@@ -9,7 +9,12 @@ import java.util.List;
 
 /**
  * Wrapper to handle the backend JSON config implementations.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class JSONConfigWrapper extends ConfigWrapper<JSONConfig> implements JSONConfig {
     /**
      * Create a config wrapper.

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

@@ -3,14 +3,21 @@ package com.willfp.eco.core.config.json.wrapper;
 import com.willfp.eco.core.config.interfaces.JSONConfig;
 import com.willfp.eco.core.config.interfaces.LoadableConfig;
 import org.apache.commons.lang.Validate;
+import org.bukkit.configuration.file.YamlConfiguration;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.io.File;
 import java.io.IOException;
 
 /**
  * Wrapper to handle the backend loadable JSON config implementations.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class LoadableJSONConfigWrapper extends JSONConfigWrapper implements LoadableConfig {
     /**
      * Create a config wrapper.
@@ -48,4 +55,9 @@ public abstract class LoadableJSONConfigWrapper extends JSONConfigWrapper implem
     public String getName() {
         return ((LoadableConfig) this.getHandle()).getName();
     }
+
+    @Override
+    public @Nullable YamlConfiguration getBukkitHandle() {
+        return null;
+    }
 }

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

@@ -23,8 +23,9 @@ import java.lang.annotation.Target;
  * <p>
  * The second:
  * <pre>{@code
- * public static void update(EcoPlugin plugin) {}
+ * public static void update(EcoPlugin plugin) {
  *     // Update code
+ * }
  * }</pre>
  * <p>
  * Config update methods in all classes in a plugin jar will be called

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

@@ -1,9 +1,11 @@
 package com.willfp.eco.core.config.wrapper;
 
 import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.core.config.interfaces.Config;
-import com.willfp.eco.core.config.interfaces.JSONConfig;
+import com.willfp.eco.core.config.interfaces.LoadableConfig;
 import org.bukkit.configuration.file.YamlConfiguration;
+import org.jetbrains.annotations.ApiStatus;
 import org.jetbrains.annotations.NotNull;
 
 import java.util.Map;
@@ -11,6 +13,7 @@ import java.util.Map;
 /**
  * Internal component to create backend config implementations.
  */
+@ApiStatus.Internal
 public interface ConfigFactory {
     /**
      * Updatable config.
@@ -20,75 +23,57 @@ public interface ConfigFactory {
      * @param subDirectoryPath The subdirectory path.
      * @param source           The class that owns the resource.
      * @param removeUnused     Whether keys not present in the default config should be removed on update.
+     * @param type             The config type.
      * @param updateBlacklist  Substring of keys to not add/remove keys for.
      * @return The config implementation.
      */
-    Config createUpdatableYamlConfig(@NotNull String configName,
-                                     @NotNull PluginLike plugin,
-                                     @NotNull String subDirectoryPath,
-                                     @NotNull Class<?> source,
-                                     boolean removeUnused,
-                                     @NotNull String... updateBlacklist);
-
-    /**
-     * Updatable config.
-     *
-     * @param configName       The name of the config
-     * @param plugin           The plugin.
-     * @param subDirectoryPath The subdirectory path.
-     * @param source           The class that owns the resource.
-     * @param removeUnused     Whether keys not present in the default config should be removed on update.
-     * @param updateBlacklist  Substring of keys to not add/remove keys for.
-     * @return The config implementation.
-     */
-    JSONConfig createUpdatableJSONConfig(@NotNull String configName,
+    LoadableConfig createUpdatableConfig(@NotNull String configName,
                                          @NotNull PluginLike plugin,
                                          @NotNull String subDirectoryPath,
                                          @NotNull Class<?> source,
                                          boolean removeUnused,
+                                         @NotNull ConfigType type,
                                          @NotNull String... updateBlacklist);
 
     /**
-     * JSON loadable config.
+     * Loadable config.
      *
      * @param configName       The name of the config
      * @param plugin           The plugin.
      * @param subDirectoryPath The subdirectory path.
      * @param source           The class that owns the resource.
+     * @param type             The config type.
      * @return The config implementation.
      */
-    JSONConfig createLoadableJSONConfig(@NotNull String configName,
+    LoadableConfig createLoadableConfig(@NotNull String configName,
                                         @NotNull PluginLike plugin,
                                         @NotNull String subDirectoryPath,
-                                        @NotNull Class<?> source);
+                                        @NotNull Class<?> source,
+                                        @NotNull ConfigType type);
 
     /**
-     * Yaml loadable config.
-     *
-     * @param configName       The name of the config
-     * @param plugin           The plugin.
-     * @param subDirectoryPath The subdirectory path.
-     * @param source           The class that owns the resource.
-     * @return The config implementation.
-     */
-    Config createLoadableYamlConfig(@NotNull String configName,
-                                    @NotNull PluginLike plugin,
-                                    @NotNull String subDirectoryPath,
-                                    @NotNull Class<?> source);
-
-    /**
-     * Yaml config.
+     * Create config.
      *
      * @param config The handle.
      * @return The config implementation.
      */
-    Config createYamlConfig(@NotNull YamlConfiguration config);
+    Config createConfig(@NotNull YamlConfiguration config);
 
     /**
-     * JSON config.
+     * Create config.
      *
      * @param values The values.
      * @return The config implementation.
      */
-    JSONConfig createJSONConfig(@NotNull Map<String, Object> values);
+    Config createConfig(@NotNull Map<String, Object> values);
+
+    /**
+     * Create config.
+     *
+     * @param contents The file contents.
+     * @param type     The type.
+     * @return The config implementation.
+     */
+    Config createConfig(@NotNull String contents,
+                        @NotNull ConfigType type);
 }

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

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.config.wrapper;
 
+import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.core.config.interfaces.Config;
 import com.willfp.eco.util.StringUtils;
 import org.jetbrains.annotations.NotNull;
@@ -15,6 +16,7 @@ import java.util.List;
  *
  * @param <T> The type of the handle.
  */
+@SuppressWarnings("MethodDoesntCallSuperMethod")
 public abstract class ConfigWrapper<T extends Config> implements Config {
     /**
      * Configs from eco have an internal implementation,
@@ -173,11 +175,26 @@ public abstract class ConfigWrapper<T extends Config> implements Config {
         return handle.getDoublesOrNull(path);
     }
 
+    @Override
+    public @NotNull List<? extends Config> getSubsections(@NotNull final String path) {
+        return handle.getSubsections(path);
+    }
+
+    @Override
+    public @Nullable List<? extends Config> getSubsectionsOrNull(@NotNull final String path) {
+        return handle.getSubsectionsOrNull(path);
+    }
+
     @Override
     public Config clone() {
         return handle.clone();
     }
 
+    @Override
+    public @NotNull ConfigType getType() {
+        return handle.getType();
+    }
+
     /**
      * Get the handle.
      *

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

@@ -0,0 +1,53 @@
+package com.willfp.eco.core.config.wrapper;
+
+import com.willfp.eco.core.config.interfaces.LoadableConfig;
+import org.bukkit.configuration.file.YamlConfiguration;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * Wrapper to handle the backend loadable yaml config implementations.
+ */
+public abstract class LoadableConfigWrapper extends ConfigWrapper<LoadableConfig> implements LoadableConfig {
+    /**
+     * Create a config wrapper.
+     *
+     * @param handle The handle.
+     */
+    protected LoadableConfigWrapper(@NotNull final LoadableConfig handle) {
+        super(handle);
+    }
+
+    @Override
+    public void createFile() {
+        this.getHandle().createFile();
+    }
+
+    @Override
+    public String getResourcePath() {
+        return this.getHandle().getResourcePath();
+    }
+
+    @Override
+    public void save() throws IOException {
+        this.getHandle().save();
+    }
+
+    @Override
+    public File getConfigFile() {
+        return this.getHandle().getConfigFile();
+    }
+
+    @Override
+    public String getName() {
+        return this.getHandle().getName();
+    }
+
+    @Override
+    public @Nullable YamlConfiguration getBukkitHandle() {
+        return this.getHandle().getBukkitHandle();
+    }
+}

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

@@ -3,6 +3,7 @@ package com.willfp.eco.core.config.yaml;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
@@ -10,7 +11,12 @@ import org.jetbrains.annotations.NotNull;
  * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
  * <p>
  * Automatically updates.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class YamlBaseConfig extends LoadableYamlConfigWrapper {
     /**
      * @param configName      The name of the config
@@ -23,12 +29,14 @@ public abstract class YamlBaseConfig extends LoadableYamlConfigWrapper {
                              @NotNull final PluginLike plugin,
                              @NotNull final String... updateBlacklist) {
         super(
-                Eco.getHandler().getConfigFactory().createUpdatableYamlConfig(
+                Eco.getHandler().getConfigFactory().createUpdatableConfig(
                         configName,
                         plugin,
                         "",
                         plugin.getClass(),
-                        removeUnused, updateBlacklist
+                        removeUnused,
+                        ConfigType.YAML,
+                        updateBlacklist
                 )
         );
     }
@@ -42,12 +50,13 @@ public abstract class YamlBaseConfig extends LoadableYamlConfigWrapper {
                              final boolean removeUnused,
                              @NotNull final PluginLike plugin) {
         super(
-                Eco.getHandler().getConfigFactory().createUpdatableYamlConfig(
+                Eco.getHandler().getConfigFactory().createUpdatableConfig(
                         configName,
                         plugin,
                         "",
                         plugin.getClass(),
-                        removeUnused
+                        removeUnused,
+                        ConfigType.YAML
                 )
         );
     }

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

@@ -3,6 +3,7 @@ package com.willfp.eco.core.config.yaml;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
@@ -14,7 +15,12 @@ import org.jetbrains.annotations.NotNull;
  * </ul>
  * <p>
  * Automatically updates.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class YamlExtendableConfig extends LoadableYamlConfigWrapper {
     /**
      * @param configName       The name of the config
@@ -31,16 +37,18 @@ public abstract class YamlExtendableConfig extends LoadableYamlConfigWrapper {
                                    @NotNull final String subDirectoryPath,
                                    @NotNull final String... updateBlacklist) {
         super(
-                Eco.getHandler().getConfigFactory().createUpdatableYamlConfig(
+                Eco.getHandler().getConfigFactory().createUpdatableConfig(
                         configName,
                         plugin,
                         subDirectoryPath,
                         source,
                         removeUnused,
+                        ConfigType.YAML,
                         updateBlacklist
                 )
         );
     }
+
     /**
      * @param configName       The name of the config
      * @param removeUnused     Whether keys not present in the default config should be removed on update.

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

@@ -3,12 +3,18 @@ package com.willfp.eco.core.config.yaml;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.PluginLike;
+import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.core.config.yaml.wrapper.LoadableYamlConfigWrapper;
 import org.jetbrains.annotations.NotNull;
 
 /**
  * Non-updatable yaml config that exists within a plugin jar.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class YamlStaticBaseConfig extends LoadableYamlConfigWrapper {
     /**
      * Config implementation for configs present in the plugin's base directory (eg config.yml, lang.yml).
@@ -20,7 +26,7 @@ public abstract class YamlStaticBaseConfig extends LoadableYamlConfigWrapper {
      */
     protected YamlStaticBaseConfig(@NotNull final String configName,
                                    @NotNull final PluginLike plugin) {
-        super(Eco.getHandler().getConfigFactory().createLoadableYamlConfig(configName, plugin, "", plugin.getClass()));
+        super(Eco.getHandler().getConfigFactory().createLoadableConfig(configName, plugin, "", plugin.getClass(), ConfigType.YAML));
     }
 
     /**

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

@@ -1,6 +1,7 @@
 package com.willfp.eco.core.config.yaml;
 
 import com.willfp.eco.core.Eco;
+import com.willfp.eco.core.config.ConfigType;
 import com.willfp.eco.core.config.yaml.wrapper.YamlConfigWrapper;
 import org.bukkit.configuration.file.YamlConfiguration;
 import org.jetbrains.annotations.NotNull;
@@ -11,19 +12,31 @@ import java.io.StringReader;
  * Config implementation for passing YamlConfigurations.
  * <p>
  * Does not automatically update.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public class YamlTransientConfig extends YamlConfigWrapper {
     /**
-     * @param config     The YamlConfiguration handle.
+     * @param config The YamlConfiguration handle.
      */
     public YamlTransientConfig(@NotNull final YamlConfiguration config) {
-        super(Eco.getHandler().getConfigFactory().createYamlConfig(config));
+        super(Eco.getHandler().getConfigFactory().createConfig(config));
     }
 
     /**
-     * @param contents     The contents of the config.
+     * @param contents The contents of the config.
      */
     public YamlTransientConfig(@NotNull final String contents) {
-        super(Eco.getHandler().getConfigFactory().createYamlConfig(YamlConfiguration.loadConfiguration(new StringReader(contents))));
+        super(Eco.getHandler().getConfigFactory().createConfig(contents, ConfigType.YAML));
+    }
+
+    /**
+     * Create a new empty transient config.
+     */
+    public YamlTransientConfig() {
+        super(Eco.getHandler().getConfigFactory().createConfig(YamlConfiguration.loadConfiguration(new StringReader(""))));
     }
 }

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

@@ -3,14 +3,21 @@ package com.willfp.eco.core.config.yaml.wrapper;
 import com.willfp.eco.core.config.interfaces.Config;
 import com.willfp.eco.core.config.interfaces.LoadableConfig;
 import org.apache.commons.lang.Validate;
+import org.bukkit.configuration.file.YamlConfiguration;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.io.File;
 import java.io.IOException;
 
 /**
  * Wrapper to handle the backend loadable yaml config implementations.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class LoadableYamlConfigWrapper extends YamlConfigWrapper implements LoadableConfig {
     /**
      * Create a config wrapper.
@@ -48,4 +55,9 @@ public abstract class LoadableYamlConfigWrapper extends YamlConfigWrapper implem
     public String getName() {
         return ((LoadableConfig) this.getHandle()).getName();
     }
+
+    @Override
+    public @Nullable YamlConfiguration getBukkitHandle() {
+        return ((LoadableConfig) this.getHandle()).getBukkitHandle();
+    }
 }

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

@@ -8,7 +8,12 @@ import org.jetbrains.annotations.NotNull;
 
 /**
  * Wrapper to handle the backend yaml config implementations.
+ *
+ * @deprecated JSON and yml have full parity, use configs without a prefix instead,
+ * eg {@link com.willfp.eco.core.config.TransientConfig}, {@link com.willfp.eco.core.config.BaseConfig}.
+ * These configs will be removed eventually.
  */
+@Deprecated(since = "6.17.0")
 public abstract class YamlConfigWrapper extends ConfigWrapper<Config> implements WrappedYamlConfiguration {
     /**
      * Create a config wrapper.

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

@@ -60,7 +60,7 @@ public final class Display {
      * @return The ItemStack.
      */
     public static ItemStack displayAndFinalize(@NotNull final ItemStack itemStack,
-                                        @Nullable final Player player) {
+                                               @Nullable final Player player) {
         return finalize(display(itemStack, player));
     }
 

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

@@ -0,0 +1,143 @@
+package com.willfp.eco.core.events;
+
+import org.bukkit.Location;
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.bukkit.inventory.ItemStack;
+import org.jetbrains.annotations.NotNull;
+
+import java.util.Collection;
+
+/**
+ * Called on DropQueue push.
+ */
+public class DropQueuePushEvent extends PlayerEvent implements Cancellable {
+    /**
+     * Cancel state.
+     */
+    private boolean cancelled;
+
+    /**
+     * If telekinetic.
+     */
+    private final boolean isTelekinetic;
+
+    /**
+     * The items.
+     */
+    private final Collection<? extends ItemStack> items;
+
+    /**
+     * The xp.
+     */
+    private final int xp;
+
+    /**
+     * The location.
+     */
+    private final Location location;
+
+    /**
+     * Bukkit parity.
+     */
+    private static final HandlerList HANDLERS = new HandlerList();
+
+    /**
+     * Create a new DropQueuePushEvent.
+     *
+     * @param player        The player.
+     * @param items         The items.
+     * @param location      The location.
+     * @param xp            The xp.
+     * @param isTelekinetic If the event is telekinetic.
+     */
+    public DropQueuePushEvent(@NotNull final Player player,
+                              @NotNull final Collection<? extends ItemStack> items,
+                              @NotNull final Location location,
+                              final int xp,
+                              final boolean isTelekinetic) {
+        super(player);
+        this.items = items;
+        this.location = location;
+        this.xp = xp;
+        this.isTelekinetic = isTelekinetic;
+    }
+
+    /**
+     * Gets a list of handlers handling this event.
+     *
+     * @return A list of handlers handling this event.
+     */
+    @Override
+    @NotNull
+    public HandlerList getHandlers() {
+        return HANDLERS;
+    }
+
+    /**
+     * Bukkit parity.
+     *
+     * @return The handler list.
+     */
+    public static HandlerList getHandlerList() {
+        return HANDLERS;
+    }
+
+    /**
+     * Get cancel state.
+     *
+     * @return The cancel state.
+     */
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    /**
+     * Set cancel state.
+     *
+     * @param cancelled If cancelled.
+     */
+    @Override
+    public void setCancelled(final boolean cancelled) {
+        this.cancelled = cancelled;
+    }
+
+    /**
+     * Get the items to be dropped.
+     *
+     * @return The items.
+     */
+    public Collection<? extends ItemStack> getItems() {
+        return items;
+    }
+
+    /**
+     * Get the xp to be dropped.
+     *
+     * @return The xp.
+     */
+    public int getXp() {
+        return xp;
+    }
+
+    /**
+     * Get the location.
+     *
+     * @return The location.
+     */
+    public Location getLocation() {
+        return location;
+    }
+
+    /**
+     * Get force telekinesis state.
+     *
+     * @return The force telekinesis state.
+     */
+    public boolean isTelekinetic() {
+        return this.isTelekinetic;
+    }
+}

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

@@ -1,6 +1,7 @@
 package com.willfp.eco.core.events;
 
 import org.bukkit.event.Listener;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * Manages listeners for a plugin.
@@ -11,14 +12,14 @@ public interface EventManager {
      *
      * @param listener The listener to register.
      */
-    void registerListener(Listener listener);
+    void registerListener(@NotNull Listener listener);
 
     /**
      * Unregister a listener with bukkit.
      *
      * @param listener The listener to unregister.
      */
-    void unregisterListener(Listener listener);
+    void unregisterListener(@NotNull Listener listener);
 
     /**
      * Unregister all listeners associated with the plugin.

eco-api/src/main/java/com/willfp/eco/core/extensions/Extension.java

@@ -7,6 +7,7 @@ import org.apache.commons.lang.Validate;
 import org.jetbrains.annotations.NotNull;
 
 import java.io.File;
+import java.util.logging.Logger;
 
 /**
  * An extension is a separate jar file that hooks into the base plugin jar.
@@ -143,6 +144,11 @@ public abstract class Extension implements PluginLike {
         return this.plugin.getConfigHandler();
     }
 
+    @Override
+    public Logger getLogger() {
+        return this.plugin.getLogger();
+    }
+
     /**
      * Get the plugin for the extension.
      *

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

@@ -70,14 +70,14 @@ public interface FastItemStack {
      *
      * @param hideFlags The flags.
      */
-    void addItemFlags(ItemFlag... hideFlags);
+    void addItemFlags(@NotNull ItemFlag... hideFlags);
 
     /**
      * Remove ItemFlags.
      *
      * @param hideFlags The flags.
      */
-    void removeItemFlags(ItemFlag... hideFlags);
+    void removeItemFlags(@NotNull ItemFlag... hideFlags);
 
     /**
      * Get the ItemFlags.
@@ -92,7 +92,7 @@ public interface FastItemStack {
      * @param flag The flag.
      * @return If the flag is present.
      */
-    boolean hasItemFlag(ItemFlag flag);
+    boolean hasItemFlag(@NotNull ItemFlag flag);
 
     /**
      * Get the Bukkit ItemStack again.

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

@@ -1,7 +1,13 @@
 package com.willfp.eco.core.integrations;
 
+import org.bukkit.Bukkit;
+import org.bukkit.plugin.Plugin;
 import org.jetbrains.annotations.NotNull;
 
+import java.util.Arrays;
+import java.util.Set;
+import java.util.stream.Collectors;
+
 /**
  * An integration loader runs a runnable only if a specific plugin is present on the server.
  * <p>
@@ -9,7 +15,15 @@ import org.jetbrains.annotations.NotNull;
  */
 public class IntegrationLoader {
     /**
-     * The lambda to be ran if the plugin is present.
+     * All loaded plugins on the server.
+     */
+    private static final Set<String> LOADED_PLUGINS = Arrays.stream(Bukkit.getPluginManager().getPlugins())
+            .map(Plugin::getName)
+            .map(String::toLowerCase)
+            .collect(Collectors.toSet());
+
+    /**
+     * The lambda to be run if the plugin is present.
      */
     private final Runnable runnable;
 
@@ -22,7 +36,7 @@ public class IntegrationLoader {
      * Create a new Integration Loader.
      *
      * @param pluginName The plugin to require.
-     * @param onLoad     The lambda to be ran if the plugin is present.
+     * @param onLoad     The lambda to be run if the plugin is present.
      */
     public IntegrationLoader(@NotNull final String pluginName,
                              @NotNull final Runnable onLoad) {
@@ -30,6 +44,15 @@ public class IntegrationLoader {
         this.pluginName = pluginName;
     }
 
+    /**
+     * Load the integration if the specified plugin is present on the server.
+     */
+    public void loadIfPresent() {
+        if (LOADED_PLUGINS.contains(this.pluginName.toLowerCase())) {
+            this.load();
+        }
+    }
+
     /**
      * Load the integration.
      */

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

@@ -24,7 +24,7 @@ public final class AnticheatManager {
      * @param anticheat The anticheat to register.
      */
     public static void register(@NotNull final EcoPlugin plugin,
-                         @NotNull final AnticheatWrapper anticheat) {
+                                @NotNull final AnticheatWrapper anticheat) {
         if (anticheat instanceof Listener) {
             plugin.getEventManager().registerListener((Listener) anticheat);
         }

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

@@ -37,6 +37,17 @@ public final class AntigriefManager {
         REGISTERED.remove(antigrief);
     }
 
+    /**
+     * Can player pickup item.
+     *
+     * @param player   The player.
+     * @param location The location.
+     * @return If player can pick up item.
+     */
+    public static boolean canPickupItem(@NotNull final Player player, @NotNull final Location location) {
+        return REGISTERED.stream().allMatch(antigriefWrapper -> antigriefWrapper.canPickupItem(player, location));
+    }
+
     /**
      * Can player break block.
      *
@@ -45,7 +56,7 @@ public final class AntigriefManager {
      * @return If player can break block.
      */
     public static boolean canBreakBlock(@NotNull final Player player,
-                                 @NotNull final Block block) {
+                                        @NotNull final Block block) {
         return REGISTERED.stream().allMatch(antigriefWrapper -> antigriefWrapper.canBreakBlock(player, block));
     }
 
@@ -57,7 +68,7 @@ public final class AntigriefManager {
      * @return If player can create explosion.
      */
     public static boolean canCreateExplosion(@NotNull final Player player,
-                                      @NotNull final Location location) {
+                                             @NotNull final Location location) {
         return REGISTERED.stream().allMatch(antigriefWrapper -> antigriefWrapper.canCreateExplosion(player, location));
     }
 
@@ -69,7 +80,7 @@ public final class AntigriefManager {
      * @return If player can place block.
      */
     public static boolean canPlaceBlock(@NotNull final Player player,
-                                 @NotNull final Block block) {
+                                        @NotNull final Block block) {
         return REGISTERED.stream().allMatch(antigriefWrapper -> antigriefWrapper.canPlaceBlock(player, block));
     }
 
@@ -81,7 +92,7 @@ public final class AntigriefManager {
      * @return If player can injure.
      */
     public static boolean canInjure(@NotNull final Player player,
-                             @NotNull final LivingEntity victim) {
+                                    @NotNull final LivingEntity victim) {
         return REGISTERED.stream().allMatch(antigriefWrapper -> antigriefWrapper.canInjure(player, victim));
     }
 

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

@@ -5,6 +5,7 @@ import org.bukkit.Location;
 import org.bukkit.block.Block;
 import org.bukkit.entity.LivingEntity;
 import org.bukkit.entity.Player;
+import org.jetbrains.annotations.NotNull;
 
 /**
  * Wrapper class for antigrief integrations.
@@ -17,7 +18,7 @@ public interface AntigriefWrapper extends Integration {
      * @param block  The block.
      * @return If player can break block.
      */
-    boolean canBreakBlock(Player player, Block block);
+    boolean canBreakBlock(@NotNull Player player, @NotNull Block block);
 
     /**
      * Can player create explosion at location.
@@ -26,7 +27,7 @@ public interface AntigriefWrapper extends Integration {
      * @param location The location.
      * @return If player can create explosion.
      */
-    boolean canCreateExplosion(Player player, Location location);
+    boolean canCreateExplosion(@NotNull Player player, @NotNull Location location);
 
     /**
      * Can player place block.
@@ -35,7 +36,7 @@ public interface AntigriefWrapper extends Integration {
      * @param block  The block.
      * @return If player can place block.
      */
-    boolean canPlaceBlock(Player player, Block block);
+    boolean canPlaceBlock(@NotNull Player player, @NotNull Block block);
 
     /**
      * Can player injure living entity.
@@ -44,5 +45,16 @@ public interface AntigriefWrapper extends Integration {
      * @param victim The victim.
      * @return If player can injure.
      */
-    boolean canInjure(Player player, LivingEntity victim);
+    boolean canInjure(@NotNull Player player, @NotNull LivingEntity victim);
+
+    /**
+     * Can player pick up item.
+     *
+     * @param player   The player.
+     * @param location The location.
+     * @return If player can pick up item.
+     */
+    default boolean canPickupItem(@NotNull Player player, @NotNull Location location) {
+        return true;
+    }
 }

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

@@ -41,7 +41,7 @@ public final class EconomyManager {
      * @return If the player has the amount.
      */
     public static boolean hasAmount(@NotNull final OfflinePlayer player,
-                             final double amount) {
+                                    final double amount) {
         for (EconomyWrapper wrapper : REGISTERED) {
             return wrapper.hasAmount(player, amount);
         }
@@ -57,7 +57,7 @@ public final class EconomyManager {
      * @return If the transaction was a success.
      */
     public static boolean giveMoney(@NotNull final OfflinePlayer player,
-                             final double amount) {
+                                    final double amount) {
         for (EconomyWrapper wrapper : REGISTERED) {
             return wrapper.giveMoney(player, amount);
         }
@@ -73,7 +73,7 @@ public final class EconomyManager {
      * @return If the transaction was a success.
      */
     public static boolean removeMoney(@NotNull final OfflinePlayer player,
-                               final double amount) {
+                                      final double amount) {
         for (EconomyWrapper wrapper : REGISTERED) {
             return wrapper.removeMoney(player, amount);
         }

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

@@ -33,7 +33,7 @@ public final class HologramManager {
      * @return The hologram.
      */
     public static Hologram createHologram(@NotNull final Location location,
-                                   @NotNull final List<String> contents) {
+                                          @NotNull final List<String> contents) {
         for (HologramWrapper wrapper : REGISTERED) {
             return wrapper.createHologram(location, contents);
         }

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

@@ -50,7 +50,7 @@ public final class Items {
      * @param item The item.
      */
     public static void registerCustomItem(@NotNull final NamespacedKey key,
-                                   @NotNull final TestableItem item) {
+                                          @NotNull final TestableItem item) {
         REGISTRY.put(key, item);
     }
 
@@ -84,7 +84,7 @@ public final class Items {
     /**
      * This is the backbone of the entire eco item system.
      * <p>
-     * You can lookup a TestableItem for any material, custom item,
+     * You can look up a TestableItem for any material, custom item,
      * or item in general, and it will return it with any modifiers
      * passed as parameters. This includes stack size (item amount)
      * and enchantments that should be present on the item.
@@ -94,8 +94,8 @@ public final class Items {
      * <p>
      * The advantages of the testable item system are that there is the inbuilt
      * {@link TestableItem#matches(ItemStack)} - this allows to check if any item
-     * is that testable item; which may sound negligible but actually it allows for
-     * much more power an flexibility. For example, you can have an item with an
+     * is that testable item; which may sound negligible, but actually it allows for
+     * much more power and flexibility. For example, you can have an item with an
      * extra metadata tag, extra lore lines, different display name - and it
      * will still work as long as the test passes. This is very important
      * for custom crafting recipes where other plugins may add metadata
@@ -104,6 +104,7 @@ public final class Items {
      * @param key The lookup string.
      * @return The testable item, or an {@link EmptyTestableItem}.
      */
+    @NotNull
     public static TestableItem lookup(@NotNull final String key) {
         if (key.contains("?")) {
             String[] options = key.split("\\?");
@@ -235,6 +236,37 @@ public final class Items {
         }
     }
 
+    /**
+     * Get a Testable Item from an ItemStack.
+     * <p>
+     * Will search for registered items first. If there are no matches in the registry,
+     * then it will return a {@link MaterialTestableItem} matching the item type.
+     * <p>
+     * Does not account for modifiers (arg parser data).
+     *
+     * @param item The ItemStack.
+     * @return The found Testable Item.
+     */
+    @NotNull
+    public static TestableItem getItem(@Nullable final ItemStack item) {
+        if (item == null || item.getType().isAir()) {
+            return new EmptyTestableItem();
+        }
+
+        CustomItem customItem = getCustomItem(item);
+
+        if (customItem != null) {
+            return customItem;
+        }
+
+        for (TestableItem known : REGISTRY.values()) {
+            if (known.matches(item)) {
+                return known;
+            }
+        }
+        return new MaterialTestableItem(item.getType());
+    }
+
     /**
      * Get if itemStack is a custom item.
      *
@@ -284,6 +316,7 @@ public final class Items {
      * @param item The item.
      * @return The CustomItem.
      */
+    @NotNull
     public static CustomItem getOrWrap(@NotNull final TestableItem item) {
         if (item instanceof CustomItem) {
             return (CustomItem) item;

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

@@ -0,0 +1,30 @@
+package com.willfp.eco.core.items.args;
+
+import org.bukkit.Bukkit;
+import org.bukkit.inventory.ItemStack;
+import org.bukkit.inventory.meta.ItemMeta;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.function.Predicate;
+
+/**
+ * Parse leather armor colors.
+ *
+ * @deprecated Moved to internals.
+ */
+@Deprecated(since = "6.16.0", forRemoval = true)
+public class ColorArgParser implements LookupArgParser {
+    /**
+     * Instantiate arg parser.
+     */
+    public ColorArgParser() {
+        Bukkit.getLogger().severe("Instantiation of class marked for removal! (" + this.getClass().getName() + "), this will throw an error in a future release!");
+    }
+
+    @Override
+    public @Nullable Predicate<ItemStack> parseArguments(@NotNull final String[] args,
+                                                         @NotNull final ItemMeta meta) {
+        return null;
+    }
+}

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

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.items.args;
 
+import org.bukkit.Bukkit;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.jetbrains.annotations.NotNull;
@@ -9,49 +10,21 @@ import java.util.function.Predicate;
 
 /**
  * Parse custom model data.
+ *
+ * @deprecated Moved to internals.
  */
+@Deprecated(since = "6.16.0", forRemoval = true)
 public class CustomModelDataArgParser implements LookupArgParser {
+    /**
+     * Instantiate arg parser.
+     */
+    public CustomModelDataArgParser() {
+        Bukkit.getLogger().severe("Instantiation of class marked for removal! (" + this.getClass().getName() + "), this will throw an error in a future release!");
+    }
+
     @Override
     public @Nullable Predicate<ItemStack> parseArguments(@NotNull final String[] args,
                                                          @NotNull final ItemMeta meta) {
-        Integer modelData = null;
-
-        for (String arg : args) {
-            String[] argSplit = arg.split(":");
-            if (!argSplit[0].equalsIgnoreCase("custom-model-data")) {
-                continue;
-            }
-
-            if (argSplit.length < 2) {
-                continue;
-            }
-
-            String asString = argSplit[1];
-
-            try {
-                modelData = Integer.parseInt(asString);
-            } catch (NumberFormatException e) {
-                modelData = null;
-            }
-        }
-
-        if (modelData == null) {
-            return null;
-        }
-
-        meta.setCustomModelData(modelData);
-
-        int finalModelData = modelData;
-        return test -> {
-            if (!test.hasItemMeta()) {
-                return false;
-            }
-
-            ItemMeta testMeta = test.getItemMeta();
-
-            assert testMeta != null;
-
-            return testMeta.getCustomModelData() == finalModelData;
-        };
+        return null;
     }
 }

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

@@ -1,83 +1,30 @@
 package com.willfp.eco.core.items.args;
 
-import org.bukkit.NamespacedKey;
-import org.bukkit.enchantments.Enchantment;
+import org.bukkit.Bukkit;
 import org.bukkit.inventory.ItemStack;
-import org.bukkit.inventory.meta.EnchantmentStorageMeta;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.util.HashMap;
-import java.util.Map;
 import java.util.function.Predicate;
 
 /**
  * Parses enchantment arguments.
+ *
+ * @deprecated Moved to internals.
  */
+@Deprecated(since = "6.16.0", forRemoval = true)
 public class EnchantmentArgParser implements LookupArgParser {
+    /**
+     * Instantiate arg parser.
+     */
+    public EnchantmentArgParser() {
+        Bukkit.getLogger().severe("Instantiation of class marked for removal! (" + this.getClass().getName() + "), this will throw an error in a future release!");
+    }
+
     @Override
     public @Nullable Predicate<ItemStack> parseArguments(@NotNull final String[] args,
                                                          @NotNull final ItemMeta meta) {
-        Map<Enchantment, Integer> requiredEnchantments = new HashMap<>();
-
-        for (String enchantArg : args) {
-            String[] enchantArgSplit = enchantArg.split(":");
-
-            Enchantment enchantment = Enchantment.getByKey(NamespacedKey.minecraft(enchantArgSplit[0].toLowerCase()));
-            if (enchantment == null) {
-                continue;
-            }
-
-            if (enchantArgSplit.length < 2) {
-                continue;
-            }
-
-            int level = Integer.parseInt(enchantArgSplit[1]);
-
-            requiredEnchantments.put(enchantment, level);
-        }
-
-        if (requiredEnchantments.isEmpty()) {
-            return null;
-        }
-
-        if (meta instanceof EnchantmentStorageMeta storageMeta) {
-            requiredEnchantments.forEach((enchantment, integer) -> storageMeta.addStoredEnchant(enchantment, integer, true));
-        } else {
-            requiredEnchantments.forEach((enchantment, integer) -> meta.addEnchant(enchantment, integer, true));
-        }
-
-        return test -> {
-            if (!test.hasItemMeta()) {
-                return false;
-            }
-
-            ItemMeta testMeta = test.getItemMeta();
-
-            assert testMeta != null;
-
-            if (testMeta instanceof EnchantmentStorageMeta storageMeta) {
-                for (Map.Entry<Enchantment, Integer> entry : requiredEnchantments.entrySet()) {
-                    if (!storageMeta.hasStoredEnchant(entry.getKey())) {
-                        return false;
-                    }
-                    if (storageMeta.getStoredEnchantLevel(entry.getKey()) < entry.getValue()) {
-                        return false;
-                    }
-                }
-            } else {
-                for (Map.Entry<Enchantment, Integer> entry : requiredEnchantments.entrySet()) {
-                    if (!testMeta.hasEnchant(entry.getKey())) {
-                        return false;
-                    }
-                    if (testMeta.getEnchantLevel(entry.getKey()) < entry.getValue()) {
-                        return false;
-                    }
-                }
-            }
-
-            return true;
-        };
+        return null;
     }
 }

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

@@ -1,9 +1,8 @@
 package com.willfp.eco.core.items.args;
 
-import com.willfp.eco.util.SkullUtils;
+import org.bukkit.Bukkit;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
-import org.bukkit.inventory.meta.SkullMeta;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
@@ -11,49 +10,21 @@ import java.util.function.Predicate;
 
 /**
  * Parse skull textures.
+ *
+ * @deprecated Moved to internals.
  */
+@Deprecated(since = "6.16.0", forRemoval = true)
 public class TextureArgParser implements LookupArgParser {
+    /**
+     * Instantiate arg parser.
+     */
+    public TextureArgParser() {
+        Bukkit.getLogger().severe("Instantiation of class marked for removal! (" + this.getClass().getName() + "), this will throw an error in a future release!");
+    }
+
     @Override
     public @Nullable Predicate<ItemStack> parseArguments(@NotNull final String[] args,
                                                          @NotNull final ItemMeta meta) {
-        String skullTexture = null;
-
-        for (String arg : args) {
-            String[] argSplit = arg.split(":");
-            if (!argSplit[0].equalsIgnoreCase("texture")) {
-                continue;
-            }
-
-            if (argSplit.length < 2) {
-                continue;
-            }
-
-            skullTexture = argSplit[1];
-        }
-
-        if (meta instanceof SkullMeta skullMeta && skullTexture != null) {
-            SkullUtils.setSkullTexture(skullMeta, skullTexture);
-        }
-
-        if (skullTexture == null) {
-            return null;
-        }
-
-        String finalSkullTexture = skullTexture;
-        return test -> {
-            if (!test.hasItemMeta()) {
-                return false;
-            }
-
-            ItemMeta testMeta = test.getItemMeta();
-
-            assert testMeta != null;
-
-            if (testMeta instanceof SkullMeta skullMeta) {
-                return finalSkullTexture.equalsIgnoreCase(SkullUtils.getSkullTexture(skullMeta));
-            }
-
-            return true;
-        };
+        return null;
     }
 }

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

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.items.builder;
 
+import com.willfp.eco.core.items.TestableItem;
 import com.willfp.eco.util.StringUtils;
 import org.apache.commons.lang.Validate;
 import org.bukkit.Material;
@@ -43,6 +44,15 @@ public abstract class AbstractItemStackBuilder<T extends ItemMeta, U extends Abs
         this(new ItemStack(material));
     }
 
+    /**
+     * Create a new ItemStackBuilder to modify an existing item.
+     *
+     * @param item The item to start with.
+     */
+    protected AbstractItemStackBuilder(@NotNull final TestableItem item) {
+        this(item.getItem());
+    }
+
     /**
      * Create a new ItemStackBuilder to modify an existing item.
      *

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

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.items.builder;
 
+import com.willfp.eco.core.items.TestableItem;
 import org.bukkit.Material;
 import org.bukkit.inventory.ItemStack;
 import org.bukkit.inventory.meta.ItemMeta;
@@ -26,4 +27,13 @@ public class ItemStackBuilder extends AbstractItemStackBuilder<ItemMeta, ItemSta
     public ItemStackBuilder(@NotNull final ItemStack base) {
         super(base);
     }
+
+    /**
+     * Create a new ItemStackBuilder to modify an existing item.
+     *
+     * @param item The item to start with.
+     */
+    public ItemStackBuilder(@NotNull final TestableItem item) {
+        super(item);
+    }
 }

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

@@ -1,5 +1,6 @@
 package com.willfp.eco.core.items.builder;
 
+import com.willfp.eco.core.items.TestableItem;
 import org.bukkit.Color;
 import org.bukkit.Material;
 import org.bukkit.inventory.ItemStack;
@@ -30,6 +31,15 @@ public class LeatherArmorBuilder extends AbstractItemStackBuilder<LeatherArmorMe
         super(base);
     }
 
+    /**
+     * Create a new ItemStackBuilder to modify an existing item.
+     *
+     * @param item The item to start with.
+     */
+    public LeatherArmorBuilder(@NotNull final TestableItem item) {
+        super(item);
+    }
+
     /**
      * Set leather color.
      *

eco-api/src/main/java/com/willfp/eco/core/proxy/AbstractProxy.java

@@ -1,14 +1,12 @@
 package com.willfp.eco.core.proxy;
 
 /**
- * All proxies must implement this interface.
- * <p>
- * A proxy is an NMS implementation of a proxy interface.
- * <p>
- * This allows for cross-version support.
- * <p>
- * See the core-spigot and core-nms modules of eco to see an example.
+ * Prior to 6.17.0, all proxies were required to implement this interface,
+ * however it produced no functionality and was not even used internally.
+ *
+ * @deprecated Unused class, not required. Will be removed in a subsequent release.
  */
+@Deprecated(since = "6.17.0", forRemoval = true)
 public interface AbstractProxy {
 
 }

eco-api/src/main/java/com/willfp/eco/core/proxy/ProxyFactory.java

@@ -13,5 +13,5 @@ public interface ProxyFactory {
      * @param <T>        The proxy class.
      * @return The proxy implementation.
      */
-    <T extends AbstractProxy> @NotNull T getProxy(@NotNull Class<T> proxyClass);
+    <T> @NotNull T getProxy(@NotNull Class<T> proxyClass);
 }

eco-api/src/main/java/com/willfp/eco/core/recipe/Recipes.java

@@ -79,7 +79,27 @@ public final class Recipes {
                                                          @NotNull final String key,
                                                          @NotNull final ItemStack output,
                                                          @NotNull final List<String> recipeStrings) {
-        ShapedCraftingRecipe.Builder builder = ShapedCraftingRecipe.builder(plugin, key).setOutput(output);
+        return createAndRegisterRecipe(plugin, key, output, recipeStrings, null);
+    }
+
+    /**
+     * Create and register recipe.
+     *
+     * @param plugin        The plugin.
+     * @param key           The key.
+     * @param output        The output.
+     * @param recipeStrings The recipe.
+     * @param permission    The permission.
+     * @return The recipe.
+     */
+    public static CraftingRecipe createAndRegisterRecipe(@NotNull final EcoPlugin plugin,
+                                                         @NotNull final String key,
+                                                         @NotNull final ItemStack output,
+                                                         @NotNull final List<String> recipeStrings,
+                                                         @Nullable final String permission) {
+        ShapedCraftingRecipe.Builder builder = ShapedCraftingRecipe.builder(plugin, key)
+                .setOutput(output)
+                .setPermission(permission);
 
         for (int i = 0; i < 9; i++) {
             builder.setRecipePart(i, Items.lookup(recipeStrings.get(i)));

eco-api/src/main/java/com/willfp/eco/core/recipe/recipes/CraftingRecipe.java

@@ -4,6 +4,7 @@ import com.willfp.eco.core.items.TestableItem;
 import org.bukkit.NamespacedKey;
 import org.bukkit.inventory.ItemStack;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.List;
 
@@ -31,6 +32,7 @@ public interface CraftingRecipe {
      *
      * @return The parts.
      */
+    @NotNull
     List<TestableItem> getParts();
 
     /**
@@ -38,6 +40,7 @@ public interface CraftingRecipe {
      *
      * @return The key.
      */
+    @NotNull
     NamespacedKey getKey();
 
     /**
@@ -45,6 +48,7 @@ public interface CraftingRecipe {
      *
      * @return The key.
      */
+    @NotNull
     NamespacedKey getDisplayedKey();
 
     /**
@@ -52,5 +56,16 @@ public interface CraftingRecipe {
      *
      * @return The output.
      */
+    @NotNull
     ItemStack getOutput();
+
+    /**
+     * Get the recipe permission.
+     *
+     * @return The permission.
+     */
+    @Nullable
+    default String getPermission() {
+        return null;
+    }
 }

eco-api/src/main/java/com/willfp/eco/core/recipe/recipes/ShapedCraftingRecipe.java

@@ -3,6 +3,7 @@ package com.willfp.eco.core.recipe.recipes;
 import com.willfp.eco.core.Eco;
 import com.willfp.eco.core.EcoPlugin;
 import com.willfp.eco.core.PluginDependent;
+import com.willfp.eco.core.Prerequisite;
 import com.willfp.eco.core.items.TestableItem;
 import com.willfp.eco.core.recipe.Recipes;
 import com.willfp.eco.core.recipe.parts.EmptyTestableItem;
@@ -14,6 +15,7 @@ import org.bukkit.inventory.RecipeChoice;
 import org.bukkit.inventory.ShapedRecipe;
 import org.bukkit.inventory.meta.ItemMeta;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.Arrays;
@@ -43,16 +45,23 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
      */
     private final ItemStack output;
 
+    /**
+     * The permission.
+     */
+    private final String permission;
+
     private ShapedCraftingRecipe(@NotNull final EcoPlugin plugin,
                                  @NotNull final String key,
                                  @NotNull final List<TestableItem> parts,
-                                 @NotNull final ItemStack output) {
+                                 @NotNull final ItemStack output,
+                                 @Nullable final String permission) {
         super(plugin);
 
         this.parts = parts;
         this.key = plugin.getNamespacedKeyFactory().create(key);
         this.displayedKey = plugin.getNamespacedKeyFactory().create(key + "_displayed");
         this.output = output;
+        this.permission = permission;
     }
 
     @Override
@@ -112,6 +121,12 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
             displayedRecipe.setIngredient(character, new RecipeChoice.ExactChoice(item));
         }
 
+        if (Prerequisite.HAS_1_18.isMet() && !Prerequisite.HAS_PAPER.isMet()) {
+            if (Bukkit.getServer().getRecipe(this.getKey()) != null) {
+                return;
+            }
+        }
+
         Bukkit.getServer().addRecipe(shapedRecipe);
         Bukkit.getServer().addRecipe(displayedRecipe);
     }
@@ -133,6 +148,8 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
      *
      * @return The parts.
      */
+    @NotNull
+    @Override
     public List<TestableItem> getParts() {
         return this.parts;
     }
@@ -142,6 +159,8 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
      *
      * @return The key.
      */
+    @NotNull
+    @Override
     public NamespacedKey getKey() {
         return this.key;
     }
@@ -151,6 +170,8 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
      *
      * @return The displayed key.
      */
+    @NotNull
+    @Override
     public NamespacedKey getDisplayedKey() {
         return this.displayedKey;
     }
@@ -160,10 +181,23 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
      *
      * @return The output.
      */
+    @NotNull
+    @Override
     public ItemStack getOutput() {
         return this.output;
     }
 
+    /**
+     * Get the permission.
+     *
+     * @return The permission.
+     */
+    @Nullable
+    @Override
+    public String getPermission() {
+        return permission;
+    }
+
     /**
      * Builder for recipes.
      */
@@ -178,6 +212,11 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
          */
         private ItemStack output = null;
 
+        /**
+         * The permission for the recipe.
+         */
+        private String permission = null;
+
         /**
          * The key of the recipe.
          */
@@ -237,6 +276,17 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
             return this;
         }
 
+        /**
+         * Set the permission required to craft the recipe.
+         *
+         * @param permission The permission.
+         * @return The builder.
+         */
+        public Builder setPermission(@Nullable final String permission) {
+            this.permission = permission;
+            return this;
+        }
+
         /**
          * Build the recipe.
          *
@@ -249,7 +299,7 @@ public final class ShapedCraftingRecipe extends PluginDependent<EcoPlugin> imple
                 }
             }
 
-            return new ShapedCraftingRecipe(plugin, key.toLowerCase(), recipeParts, output);
+            return new ShapedCraftingRecipe(plugin, key.toLowerCase(), recipeParts, output, permission);
         }
     }
 }

eco-api/src/main/java/com/willfp/eco/core/scheduling/Scheduler.java

@@ -18,6 +18,20 @@ public interface Scheduler {
     BukkitTask runLater(@NotNull Runnable runnable,
                         long ticksLater);
 
+    /**
+     * Run the task after a specified tick delay.
+     * <p>
+     * Reordered for better kotlin interop.
+     *
+     * @param runnable   The lambda to run.
+     * @param ticksLater The amount of ticks to wait before execution.
+     * @return The created {@link BukkitTask}.
+     */
+    default BukkitTask runLater(long ticksLater,
+                                @NotNull Runnable runnable) {
+        return runLater(runnable, ticksLater);
+    }
+
     /**
      * Run the task repeatedly on a timer.
      *
@@ -30,6 +44,22 @@ public interface Scheduler {
                         long delay,
                         long repeat);
 
+    /**
+     * Run the task repeatedly on a timer.
+     * <p>
+     * Reordered for better kotlin interop.
+     *
+     * @param runnable The lambda to run.
+     * @param delay    The amount of ticks to wait before the first execution.
+     * @param repeat   The amount of ticks to wait between executions.
+     * @return The created {@link BukkitTask}.
+     */
+    default BukkitTask runTimer(long delay,
+                                long repeat,
+                                @NotNull Runnable runnable) {
+        return runTimer(runnable, delay, repeat);
+    }
+
     /**
      * Run the task repeatedly and asynchronously on a timer.
      *
@@ -42,6 +72,22 @@ public interface Scheduler {
                              long delay,
                              long repeat);
 
+    /**
+     * Run the task repeatedly and asynchronously on a timer.
+     * <p>
+     * Reordered for better kotlin interop.
+     *
+     * @param runnable The lambda to run.
+     * @param delay    The amount of ticks to wait before the first execution.
+     * @param repeat   The amount of ticks to wait between executions.
+     * @return The created {@link BukkitTask}.
+     */
+    default BukkitTask runAsyncTimer(long delay,
+                                     long repeat,
+                                     @NotNull Runnable runnable) {
+        return runAsyncTimer(runnable, delay, repeat);
+    }
+
     /**
      * Run the task.
      *
@@ -70,6 +116,22 @@ public interface Scheduler {
                       long delay,
                       long repeat);
 
+    /**
+     * Schedule the task to be ran repeatedly on a timer.
+     * <p>
+     * Reordered for better kotlin interop.
+     *
+     * @param runnable The lambda to run.
+     * @param delay    The amount of ticks to wait before the first execution.
+     * @param repeat   The amount of ticks to wait between executions.
+     * @return The id of the task.
+     */
+    default int syncRepeating(long delay,
+                              long repeat,
+                              @NotNull Runnable runnable) {
+        return syncRepeating(runnable, delay, repeat);
+    }
+
     /**
      * Cancel all running tasks from the linked {@link EcoPlugin}.
      */

eco-api/src/main/java/com/willfp/eco/core/web/Paste.java

@@ -92,7 +92,7 @@ public class Paste {
             conn.setRequestMethod("GET");
             try (var reader = new BufferedReader(
                     new InputStreamReader(conn.getInputStream()))) {
-                for (String line; (line = reader.readLine()) != null;) {
+                for (String line; (line = reader.readLine()) != null; ) {
                     result.append(line);
                 }
             }

eco-api/src/main/java/com/willfp/eco/util/ListUtils.java

@@ -4,6 +4,7 @@ import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
+import java.util.Collections;
 import java.util.HashMap;
 import java.util.List;
 import java.util.Map;
@@ -21,8 +22,8 @@ public final class ListUtils {
      * @return The list, filled will null objects.
      */
     @NotNull
-    public static <@Nullable T> List<List<T>> create2DList(final int rows,
-                                                           final int columns) {
+    public static <T> List<List<T>> create2DList(final int rows,
+                                                 final int columns) {
         List<List<T>> list = new ArrayList<>(rows);
         while (list.size() < rows) {
             List<T> row = new ArrayList<>(columns);
@@ -56,6 +57,40 @@ public final class ListUtils {
         return frequencyMap;
     }
 
+    /**
+     * Convert nullable object to either singleton list or empty list.
+     *
+     * @param object The object.
+     * @param <T>    The type of the object.
+     * @return The list.
+     */
+    @NotNull
+    public static <T> List<T> toSingletonList(@Nullable final T object) {
+        if (object == null) {
+            return Collections.emptyList();
+        } else {
+            return Collections.singletonList(object);
+        }
+    }
+
+    /**
+     * Get element from list or return null if out of bounds.
+     *
+     * @param list  The list.
+     * @param index The index.
+     * @param <T>   The type of the list.
+     * @return The found element, or null if out of bounds.
+     */
+    @Nullable
+    public static <T> T getOrNull(@Nullable final List<T> list,
+                                  final int index) {
+        if (list == null) {
+            return null;
+        }
+
+        return index >= 0 && index < list.size() ? list.get(index) : null;
+    }
+
     private ListUtils() {
         throw new UnsupportedOperationException("This is a utility class and cannot be instantiated");
     }

eco-api/src/main/java/com/willfp/eco/util/PlayerUtils.java

@@ -82,13 +82,12 @@ public final class PlayerUtils {
      * @return The player name.
      */
     public static String getSavedDisplayName(@NotNull final OfflinePlayer player) {
-        PlayerProfile profile = PlayerProfile.load(player);
-
         if (player instanceof Player onlinePlayer) {
-            profile.write(PLAYER_NAME_KEY, onlinePlayer.getDisplayName());
-            return onlinePlayer.getDisplayName();
+            updateSavedDisplayName(onlinePlayer);
         }
 
+        PlayerProfile profile = PlayerProfile.load(player);
+
         String saved = profile.read(PLAYER_NAME_KEY);
 
         if (saved.equals(PLAYER_NAME_KEY.getDefaultValue())) {

eco-api/src/main/java/com/willfp/eco/util/PotionUtils.java

@@ -16,30 +16,45 @@ public final class PotionUtils {
     public static int getDuration(@NotNull final PotionData data) {
         if (data.isExtended()) {
             return switch (data.getType()) {
-                case INSTANT_DAMAGE, INSTANT_HEAL: yield 0;
-                case POISON, REGEN: yield 1800;
-                case SLOW_FALLING, WEAKNESS, SLOWNESS: yield 4800;
-                case TURTLE_MASTER: yield 800;
-                default: yield 9600;
+                case INSTANT_DAMAGE, INSTANT_HEAL:
+                    yield 0;
+                case POISON, REGEN:
+                    yield 1800;
+                case SLOW_FALLING, WEAKNESS, SLOWNESS:
+                    yield 4800;
+                case TURTLE_MASTER:
+                    yield 800;
+                default:
+                    yield 9600;
             };
         }
 
         if (data.isUpgraded()) {
             return switch (data.getType()) {
-                case INSTANT_DAMAGE, INSTANT_HEAL: yield 0;
-                case POISON, REGEN: yield 420;
-                case SLOW_FALLING, WEAKNESS, SLOWNESS: yield 440;
-                case TURTLE_MASTER: yield 400;
-                default: yield 1800;
+                case INSTANT_DAMAGE, INSTANT_HEAL:
+                    yield 0;
+                case POISON, REGEN:
+                    yield 420;
+                case SLOW_FALLING, WEAKNESS, SLOWNESS:
+                    yield 440;
+                case TURTLE_MASTER:
+                    yield 400;
+                default:
+                    yield 1800;
             };
         }
 
         return switch (data.getType()) {
-            case INSTANT_DAMAGE, INSTANT_HEAL: yield 0;
-            case POISON, REGEN: yield 900;
-            case SLOW_FALLING, WEAKNESS, SLOWNESS: yield 400;
-            case TURTLE_MASTER: yield 1800;
-            default: yield 3600;
+            case INSTANT_DAMAGE, INSTANT_HEAL:
+                yield 0;
+            case POISON, REGEN:
+                yield 900;
+            case SLOW_FALLING, WEAKNESS, SLOWNESS:
+                yield 400;
+            case TURTLE_MASTER:
+                yield 1800;
+            default:
+                yield 3600;
         };
     }
 

eco-api/src/main/java/com/willfp/eco/util/SkullUtils.java

@@ -35,7 +35,7 @@ public final class SkullUtils {
      * @param base64 The base64 texture.
      */
     public static void setSkullTexture(@NotNull final SkullMeta meta,
-                                @NotNull final String base64) {
+                                       @NotNull final String base64) {
         Validate.isTrue(initialized, "Must be initialized!");
         Validate.notNull(metaSetConsumer, "Must be initialized!");
 
@@ -64,7 +64,7 @@ public final class SkullUtils {
      */
     @ApiStatus.Internal
     public static void initialize(@NotNull final BiConsumer<SkullMeta, String> function,
-                           @NotNull final Function<SkullMeta, String> function2) {
+                                  @NotNull final Function<SkullMeta, String> function2) {
         Validate.isTrue(!initialized, "Already initialized!");
 
         metaSetConsumer = function;

eco-api/src/main/java/com/willfp/eco/util/StringUtils.java

@@ -14,7 +14,7 @@ import org.bukkit.entity.Player;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
-import java.awt.*;
+import java.awt.Color;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.List;

eco-core/build.gradle

@@ -4,7 +4,7 @@ buildscript {
     }
 
     dependencies {
-        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.5.31"
+        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:1.6.0"
     }
 }
 
@@ -16,14 +16,14 @@ subprojects {
 
     dependencies {
         compileOnly project(":eco-api")
-        compileOnly 'org.jetbrains.kotlin:kotlin-stdlib:1.5.31'
+        compileOnly 'org.jetbrains.kotlin:kotlin-stdlib:1.6.0'
     }
 
     compileKotlin {
         kotlinOptions {
-            jvmTarget = "16"
+            jvmTarget = "17"
         }
-        targetCompatibility = JavaVersion.VERSION_16
-        sourceCompatibility = JavaVersion.VERSION_16
+        targetCompatibility = JavaVersion.VERSION_17
+        sourceCompatibility = JavaVersion.VERSION_17
     }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/EcoConfigFactory.kt

@@ -1,87 +1,93 @@
 package com.willfp.eco.internal.config
 
 import com.willfp.eco.core.PluginLike
+import com.willfp.eco.core.config.ConfigType
 import com.willfp.eco.core.config.interfaces.Config
-import com.willfp.eco.core.config.interfaces.JSONConfig
+import com.willfp.eco.core.config.interfaces.LoadableConfig
 import com.willfp.eco.core.config.wrapper.ConfigFactory
 import com.willfp.eco.internal.config.json.EcoJSONConfigSection
+import com.willfp.eco.internal.config.json.EcoJSONConfigWrapper
 import com.willfp.eco.internal.config.json.EcoLoadableJSONConfig
 import com.willfp.eco.internal.config.json.EcoUpdatableJSONConfig
 import com.willfp.eco.internal.config.yaml.EcoLoadableYamlConfig
 import com.willfp.eco.internal.config.yaml.EcoUpdatableYamlConfig
 import com.willfp.eco.internal.config.yaml.EcoYamlConfigSection
 import org.bukkit.configuration.file.YamlConfiguration
+import java.io.StringReader
 
 class EcoConfigFactory : ConfigFactory {
-    override fun createUpdatableYamlConfig(
-        configName: String,
-        plugin: PluginLike,
-        subDirectoryPath: String,
-        source: Class<*>,
-        removeUnused: Boolean,
-        vararg updateBlacklist: String
-    ): Config {
-        return EcoUpdatableYamlConfig(
-            configName,
-            plugin,
-            subDirectoryPath,
-            source,
-            removeUnused,
-            *updateBlacklist
-        )
-    }
-
-    override fun createUpdatableJSONConfig(
-        configName: String,
-        plugin: PluginLike,
-        subDirectoryPath: String,
-        source: Class<*>,
-        removeUnused: Boolean,
-        vararg updateBlacklist: String
-    ): JSONConfig {
-        return EcoUpdatableJSONConfig(
-            configName,
-            plugin,
-            subDirectoryPath,
-            source,
-            removeUnused,
-            *updateBlacklist
-        )
-    }
-
-    override fun createLoadableJSONConfig(
-        configName: String,
-        plugin: PluginLike,
-        subDirectoryPath: String,
-        source: Class<*>
-    ): JSONConfig {
-        return EcoLoadableJSONConfig(
-            configName,
-            plugin,
-            subDirectoryPath,
-            source
-        )
-    }
-
-    override fun createLoadableYamlConfig(
-        configName: String,
-        plugin: PluginLike,
-        subDirectoryPath: String,
-        source: Class<*>
-    ): Config {
-        return EcoLoadableYamlConfig(
-            configName,
-            plugin,
-            subDirectoryPath,
-            source
-        )
-    }
-
-    override fun createYamlConfig(config: YamlConfiguration): Config {
+    override fun createConfig(config: YamlConfiguration): Config {
         return EcoYamlConfigSection(config)
     }
 
-    override fun createJSONConfig(values: Map<String, Any>): JSONConfig {
+    override fun createConfig(values: MutableMap<String, Any>): Config {
         return EcoJSONConfigSection(values)
     }
+
+    override fun createConfig(contents: String, type: ConfigType): Config {
+        return if (type == ConfigType.JSON) {
+            @Suppress("UNCHECKED_CAST")
+            EcoJSONConfigSection(
+                EcoJSONConfigWrapper.gson.fromJson(
+                    StringReader(contents), Map::class.java
+                ) as MutableMap<String, Any>
+            )
+        } else {
+            EcoYamlConfigSection(YamlConfiguration.loadConfiguration(StringReader(contents)))
+        }
+    }
+
+    override fun createLoadableConfig(
+        configName: String,
+        plugin: PluginLike,
+        subDirectoryPath: String,
+        source: Class<*>,
+        type: ConfigType
+    ): LoadableConfig {
+        return if (type == ConfigType.JSON) {
+            EcoLoadableJSONConfig(
+                configName,
+                plugin,
+                subDirectoryPath,
+                source
+            )
+        } else {
+            EcoLoadableYamlConfig(
+                configName,
+                plugin,
+                subDirectoryPath,
+                source
+            )
+        }
+    }
+
+    override fun createUpdatableConfig(
+        configName: String,
+        plugin: PluginLike,
+        subDirectoryPath: String,
+        source: Class<*>,
+        removeUnused: Boolean,
+        type: ConfigType,
+        vararg updateBlacklist: String
+    ): LoadableConfig {
+        return if (type == ConfigType.JSON) {
+            EcoUpdatableJSONConfig(
+                configName,
+                plugin,
+                subDirectoryPath,
+                source,
+                removeUnused,
+                *updateBlacklist
+            )
+        } else {
+            EcoUpdatableYamlConfig(
+                configName,
+                plugin,
+                subDirectoryPath,
+                source,
+                removeUnused,
+                *updateBlacklist
+            )
+        }
+    }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigSection.kt

@@ -1,5 +1,6 @@
 package com.willfp.eco.internal.config.json
 
+@Suppress("UNCHECKED_CAST")
 class EcoJSONConfigSection(values: Map<String, Any?>) : EcoJSONConfigWrapper() {
     init {
         init(values)

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoJSONConfigWrapper.kt

@@ -1,18 +1,24 @@
+@file:Suppress("DEPRECATION")
+
 package com.willfp.eco.internal.config.json
 
 import com.google.gson.Gson
 import com.google.gson.GsonBuilder
+import com.willfp.eco.core.config.ConfigType
 import com.willfp.eco.core.config.interfaces.JSONConfig
 import com.willfp.eco.util.StringUtils
+import org.bukkit.configuration.file.YamlConfiguration
 import java.util.Objects
 import java.util.concurrent.ConcurrentHashMap
 
 @Suppress("UNCHECKED_CAST")
 open class EcoJSONConfigWrapper : JSONConfig {
-    val handle: Gson = GsonBuilder()
-        .setPrettyPrinting()
-        .disableHtmlEscaping()
-        .create()
+    companion object {
+        val gson: Gson = GsonBuilder()
+            .setPrettyPrinting()
+            .disableHtmlEscaping()
+            .create()
+    }
 
     val values = ConcurrentHashMap<String, Any?>()
 
@@ -28,14 +34,14 @@ open class EcoJSONConfigWrapper : JSONConfig {
     }
 
     override fun toPlaintext(): String {
-        return this.handle.toJson(this.values)
+        return gson.toJson(this.values)
     }
 
     override fun has(path: String): Boolean {
         return getOfKnownType(path, Any::class.java) != null
     }
 
-    private fun <T: Any?> getOfKnownType(
+    private fun <T : Any?> getOfKnownType(
         path: String,
         clazz: Class<T>
     ): T? {
@@ -173,7 +179,10 @@ open class EcoJSONConfigWrapper : JSONConfig {
     }
 
     override fun getInts(path: String): MutableList<Int> {
-        return (Objects.requireNonNullElse(getOfKnownType(path, Any::class.java), emptyList<Int>()) as List<Int>).toMutableList()
+        return (Objects.requireNonNullElse(
+            getOfKnownType(path, Any::class.java),
+            emptyList<Int>()
+        ) as List<Int>).toMutableList()
     }
 
     override fun getIntsOrNull(path: String): MutableList<Int>? {
@@ -197,7 +206,10 @@ open class EcoJSONConfigWrapper : JSONConfig {
     }
 
     override fun getBools(path: String): MutableList<Boolean> {
-        return (Objects.requireNonNullElse(getOfKnownType(path, Any::class.java), emptyList<Boolean>()) as List<Boolean>).toMutableList()
+        return (Objects.requireNonNullElse(
+            getOfKnownType(path, Any::class.java),
+            emptyList<Boolean>()
+        ) as List<Boolean>).toMutableList()
     }
 
     override fun getBoolsOrNull(path: String): MutableList<Boolean>? {
@@ -235,7 +247,10 @@ open class EcoJSONConfigWrapper : JSONConfig {
         option: StringUtils.FormatOption
     ): MutableList<String> {
         val strings =
-            (Objects.requireNonNullElse(getOfKnownType(path, Any::class.java), emptyList<String>()) as List<String>).toMutableList()
+            (Objects.requireNonNullElse(
+                getOfKnownType(path, Any::class.java),
+                emptyList<String>()
+            ) as List<String>).toMutableList()
         return if (format) StringUtils.formatList(strings, option) else strings
     }
 
@@ -264,7 +279,10 @@ open class EcoJSONConfigWrapper : JSONConfig {
     }
 
     override fun getDoubles(path: String): MutableList<Double> {
-        return (Objects.requireNonNullElse(getOfKnownType(path, Any::class.java), emptyList<Double>()) as List<Double>).toMutableList()
+        return (Objects.requireNonNullElse(
+            getOfKnownType(path, Any::class.java),
+            emptyList<Double>()
+        ) as List<Double>).toMutableList()
     }
 
     override fun getDoublesOrNull(path: String): MutableList<Double>? {
@@ -275,6 +293,10 @@ open class EcoJSONConfigWrapper : JSONConfig {
         }
     }
 
+    override fun getType(): ConfigType {
+        return ConfigType.JSON
+    }
+
     override fun clone(): JSONConfig {
         return EcoJSONConfigSection(this.values.toMutableMap())
     }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/json/EcoLoadableJSONConfig.kt

@@ -2,6 +2,7 @@ package com.willfp.eco.internal.config.json
 
 import com.willfp.eco.core.PluginLike
 import com.willfp.eco.core.config.interfaces.LoadableConfig
+import org.bukkit.configuration.file.YamlConfiguration
 import java.io.File
 import java.io.FileNotFoundException
 import java.io.FileOutputStream
@@ -30,7 +31,7 @@ open class EcoLoadableJSONConfig(
         }
     }
 
-    override fun createFile() {
+    final override fun createFile() {
         val inputStream = source.getResourceAsStream(resourcePath)!!
         val outFile = File(this.plugin.dataFolder, resourcePath)
         val lastIndex = resourcePath.lastIndexOf('/')
@@ -40,7 +41,7 @@ open class EcoLoadableJSONConfig(
         }
         if (!outFile.exists()) {
             val out: OutputStream = FileOutputStream(outFile)
-            inputStream.copyTo(out, 1024)
+            inputStream.copyTo(out)
             out.close()
             inputStream.close()
         }
@@ -69,7 +70,7 @@ open class EcoLoadableJSONConfig(
 
     @Throws(FileNotFoundException::class)
     fun init(file: File) {
-        super.init(handle.fromJson(FileReader(file), Map::class.java) as MutableMap<String, Any>)
+        super.init(gson.fromJson(FileReader(file), Map::class.java) as MutableMap<String, Any>)
     }
 
     override fun getName(): String {
@@ -80,6 +81,10 @@ open class EcoLoadableJSONConfig(
         return configFile
     }
 
+    override fun getBukkitHandle(): YamlConfiguration? {
+        return null
+    }
+
     init {
         val directory = File(this.plugin.dataFolder, subDirectoryPath)
         if (!directory.exists()) {

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoLoadableYamlConfig.kt

@@ -1,3 +1,5 @@
+@file:Suppress("DEPRECATION")
+
 package com.willfp.eco.internal.config.yaml
 
 import com.willfp.eco.core.PluginLike
@@ -40,11 +42,10 @@ open class EcoLoadableYamlConfig(
         }
         if (!outFile.exists()) {
             val out: OutputStream = FileOutputStream(outFile)
-            inputStream.copyTo(out, 1024)
+            inputStream.copyTo(out)
             out.close()
             inputStream.close()
         }
-        plugin.configHandler.addConfig(this)
     }
 
     override fun getResourcePath(): String {
@@ -61,10 +62,6 @@ open class EcoLoadableYamlConfig(
         handle.save(getConfigFile())
     }
 
-    override fun getBukkitHandle(): YamlConfiguration {
-        return handle
-    }
-
     override fun getName(): String {
         return name
     }
@@ -73,6 +70,10 @@ open class EcoLoadableYamlConfig(
         return configFile
     }
 
+    override fun getBukkitHandle(): YamlConfiguration? {
+        return handle
+    }
+
     init {
         val directory = File(this.plugin.dataFolder, subDirectoryPath)
         if (!directory.exists()) {

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/config/yaml/EcoYamlConfigWrapper.kt

@@ -1,16 +1,16 @@
 package com.willfp.eco.internal.config.yaml
 
+import com.willfp.eco.core.config.ConfigType
 import com.willfp.eco.core.config.interfaces.Config
 import com.willfp.eco.util.StringUtils
 import org.bukkit.configuration.ConfigurationSection
 import org.bukkit.configuration.file.YamlConfiguration
 import java.io.StringReader
-import java.util.concurrent.ConcurrentHashMap
 
 @Suppress("UNCHECKED_CAST")
 open class EcoYamlConfigWrapper<T : ConfigurationSection> : Config {
     lateinit var handle: T
-    private val cache = ConcurrentHashMap<String, Any?>()
+    private val cache = mutableMapOf<String, Any?>()
 
     protected fun init(config: T): Config {
         handle = config
@@ -70,9 +70,9 @@ open class EcoYamlConfigWrapper<T : ConfigurationSection> : Config {
 
     override fun getInt(path: String): Int {
         return if (cache.containsKey(path)) {
-            cache[path] as Int
+            (cache[path] as Number).toInt()
         } else {
-            cache[path] = handle.getInt(path, 0)
+            cache[path] = handle.getDouble(path, 0.0).toInt()
             getInt(path)
         }
     }
@@ -90,9 +90,9 @@ open class EcoYamlConfigWrapper<T : ConfigurationSection> : Config {
         def: Int
     ): Int {
         return if (cache.containsKey(path)) {
-            cache[path] as Int
+            (cache[path] as Number).toInt()
         } else {
-            cache[path] = handle.getInt(path, def)
+            cache[path] = handle.getDouble(path, def.toDouble()).toInt()
             getInt(path)
         }
     }
@@ -262,6 +262,35 @@ open class EcoYamlConfigWrapper<T : ConfigurationSection> : Config {
         }
     }
 
+    override fun getSubsections(path: String): MutableList<out Config> {
+        return if (cache.containsKey(path)) {
+            (cache[path] as Collection<Config>).toMutableList()
+        } else {
+            val mapList = ArrayList(handle.getMapList(path)) as List<Map<String, Any?>>
+            val configList = mutableListOf<Config>()
+            for (map in mapList) {
+                val temp = YamlConfiguration.loadConfiguration(StringReader(""))
+                temp.createSection("a", map)
+                configList.add(EcoYamlConfigSection(temp.getConfigurationSection("a")!!))
+            }
+
+            cache[path] = if (has(path)) configList else emptyList()
+            getSubsections(path)
+        }
+    }
+
+    override fun getSubsectionsOrNull(path: String): MutableList<out Config>? {
+        return if (has(path)) {
+            getSubsections(path)
+        } else {
+            null
+        }
+    }
+
+    override fun getType(): ConfigType {
+        return ConfigType.JSON
+    }
+
     override fun clone(): Config {
         return EcoYamlConfigSection(
             YamlConfiguration.loadConfiguration(

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/drops/impl/EcoDropQueue.kt

@@ -1,6 +1,8 @@
 package com.willfp.eco.internal.drops.impl
 
 import com.willfp.eco.core.drops.InternalDropQueue
+import com.willfp.eco.core.events.DropQueuePushEvent
+import com.willfp.eco.core.integrations.antigrief.AntigriefManager
 import com.willfp.eco.util.TelekinesisUtils
 import org.bukkit.Bukkit
 import org.bukkit.Location
@@ -15,7 +17,7 @@ import org.bukkit.util.Vector
 open class EcoDropQueue(val player: Player) : InternalDropQueue {
     val items = mutableListOf<ItemStack>()
     var xp: Int = 0
-    var loc: Location
+    var location: Location
     var hasTelekinesis = false
 
     override fun addItem(item: ItemStack): InternalDropQueue {
@@ -34,7 +36,7 @@ open class EcoDropQueue(val player: Player) : InternalDropQueue {
     }
 
     override fun setLocation(location: Location): InternalDropQueue {
-        loc = location
+        this.location = location
         return this
     }
 
@@ -47,8 +49,20 @@ open class EcoDropQueue(val player: Player) : InternalDropQueue {
         if (!hasTelekinesis) {
             hasTelekinesis = TelekinesisUtils.testPlayer(player)
         }
-        val world = loc.world!!
-        loc = loc.add(0.5, 0.5, 0.5)
+
+        if (hasTelekinesis && !AntigriefManager.canPickupItem(player, location)) {
+            hasTelekinesis = false
+        }
+
+        val pushEvent = DropQueuePushEvent(player, items, location, xp, hasTelekinesis)
+        Bukkit.getServer().pluginManager.callEvent(pushEvent)
+
+        if (pushEvent.isCancelled) {
+            return
+        }
+
+        val world = location.world!!
+        location = location.add(0.5, 0.5, 0.5)
         items.removeIf { itemStack: ItemStack -> itemStack.type == Material.AIR }
         if (items.isEmpty()) {
             return
@@ -56,7 +70,7 @@ open class EcoDropQueue(val player: Player) : InternalDropQueue {
         if (hasTelekinesis) {
             val leftover = player.inventory.addItem(*items.toTypedArray())
             for (drop in leftover.values) {
-                world.dropItem(loc, drop!!).velocity = Vector()
+                world.dropItem(location, drop!!).velocity = Vector()
             }
             if (xp > 0) {
                 val event = PlayerExpChangeEvent(player, xp)
@@ -68,16 +82,16 @@ open class EcoDropQueue(val player: Player) : InternalDropQueue {
             }
         } else {
             for (drop in items) {
-                world.dropItem(loc, drop).velocity = Vector()
+                world.dropItem(location, drop).velocity = Vector()
             }
             if (xp > 0) {
-                val orb = world.spawnEntity(loc, EntityType.EXPERIENCE_ORB) as ExperienceOrb
+                val orb = world.spawnEntity(location, EntityType.EXPERIENCE_ORB) as ExperienceOrb
                 orb.experience = xp
             }
         }
     }
 
     init {
-        loc = player.location
+        location = player.location
     }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/drops/impl/EcoFastCollatedDropQueue.kt

@@ -10,10 +10,10 @@ class EcoFastCollatedDropQueue(player: Player) : EcoDropQueue(player) {
         val fetched = COLLATED_MAP[player]
 
         if (fetched == null) {
-            COLLATED_MAP[player] = CollatedDrops(items, loc, xp, hasTelekinesis)
+            COLLATED_MAP[player] = CollatedDrops(items, location, xp, hasTelekinesis)
         } else {
             fetched.addDrops(items)
-            fetched.location = loc
+            fetched.location = location
             fetched.addXp(xp)
             if (this.hasTelekinesis) {
                 fetched.forceTelekinesis()

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/extensions/EcoExtensionLoader.kt

@@ -2,7 +2,7 @@ package com.willfp.eco.internal.extensions
 
 import com.google.common.collect.ImmutableSet
 import com.willfp.eco.core.EcoPlugin
-import com.willfp.eco.core.config.yaml.YamlTransientConfig
+import com.willfp.eco.core.config.TransientConfig
 import com.willfp.eco.core.extensions.Extension
 import com.willfp.eco.core.extensions.ExtensionLoader
 import com.willfp.eco.core.extensions.ExtensionMetadata
@@ -54,7 +54,7 @@ class EcoExtensionLoader(
         val ymlIn = classLoader.getResourceAsStream("extension.yml")
             ?: throw MalformedExtensionException("No extension.yml found in " + extensionJar.name)
 
-        val extensionYml = YamlTransientConfig(YamlConfiguration.loadConfiguration(InputStreamReader(ymlIn)))
+        val extensionYml = TransientConfig(YamlConfiguration.loadConfiguration(InputStreamReader(ymlIn)))
 
         val mainClass = extensionYml.getStringOrNull("main")
         var name = extensionYml.getStringOrNull("name")

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/menu/ExtendedInventory.kt

@@ -1,8 +1,8 @@
 package com.willfp.eco.internal.gui.menu
 
-import com.willfp.eco.internal.gui.slot.EcoCaptivatorSlot
 import com.willfp.eco.util.MenuUtils
 import com.willfp.eco.util.StringUtils
+import org.bukkit.Material
 import org.bukkit.NamespacedKey
 import org.bukkit.entity.Player
 import org.bukkit.inventory.Inventory
@@ -20,12 +20,14 @@ class ExtendedInventory(
         for (i in 0 until inventory.size) {
             val (row, column) = MenuUtils.convertSlotToRowColumn(i)
             val slot = menu.getSlot(row, column)
-            if (slot is EcoCaptivatorSlot) {
+            if (slot.isCaptive) {
                 val defaultItem = slot.getItemStack(player)
                 val item = inventory.getItem(i) ?: continue
-                if (item != defaultItem) {
-                    captiveItems.add(item)
+                if (item == defaultItem && item.type == Material.AIR) {
+                    continue
                 }
+
+                captiveItems.add(item)
             }
         }
 

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoCaptivatorSlot.kt

@@ -1,28 +0,0 @@
-package com.willfp.eco.internal.gui.slot
-
-import com.willfp.eco.core.Eco
-import com.willfp.eco.core.gui.slot.functional.SlotHandler
-import org.bukkit.Material
-import org.bukkit.inventory.ItemStack
-
-class EcoCaptivatorSlot : EcoSlot(
-    { _, _ -> ItemStack(Material.AIR) },
-    allowMovingItem,
-    allowMovingItem,
-    allowMovingItem,
-    allowMovingItem,
-    allowMovingItem,
-    { _, _, _ -> }
-) {
-    companion object {
-        val plugin = Eco.getHandler().ecoPlugin
-
-        val allowMovingItem = SlotHandler { event, _, _ ->
-            event.isCancelled = false
-        }
-    }
-
-    override fun isCaptive(): Boolean {
-        return true
-    }
-}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoCaptiveSlot.kt

@@ -0,0 +1,24 @@
+package com.willfp.eco.internal.gui.slot
+
+import com.willfp.eco.core.gui.slot.functional.SlotHandler
+import com.willfp.eco.core.gui.slot.functional.SlotProvider
+
+class EcoCaptiveSlot(
+    provider: SlotProvider
+) : EcoSlot(
+    provider,
+    allowMovingItem,
+    allowMovingItem,
+    allowMovingItem,
+    allowMovingItem,
+    allowMovingItem,
+    { _, _, _ -> }
+) {
+    override fun isCaptive(): Boolean {
+        return true
+    }
+}
+
+private val allowMovingItem = SlotHandler { event, _, _ ->
+    event.isCancelled = false
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlot.kt

@@ -31,8 +31,7 @@ open class EcoSlot(
             ClickType.SHIFT_LEFT -> this.onShiftLeftClick.handle(event, this, menu)
             ClickType.SHIFT_RIGHT -> this.onShiftRightClick.handle(event, this, menu)
             ClickType.MIDDLE -> this.onMiddleClick.handle(event, this, menu)
-            else -> {
-            }
+            else -> {}
         }
     }
 

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/gui/slot/EcoSlotBuilder.kt

@@ -58,7 +58,7 @@ class EcoSlotBuilder(private val provider: SlotProvider) : SlotBuilder {
 
     override fun build(): Slot {
         return if (captive) {
-            EcoCaptivatorSlot()
+            EcoCaptiveSlot(provider)
         } else {
             EcoSlot(provider, onLeftClick, onRightClick, onShiftLeftClick, onShiftRightClick, onMiddleClick, modifier)
         }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserColor.kt

@@ -0,0 +1,44 @@
+package com.willfp.eco.internal.items
+
+import com.willfp.eco.core.items.args.LookupArgParser
+import org.bukkit.Color
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.ItemMeta
+import org.bukkit.inventory.meta.LeatherArmorMeta
+import java.util.function.Predicate
+
+class ArgParserColor : LookupArgParser {
+    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+        if (meta !is LeatherArmorMeta) {
+            return null
+        }
+
+        var color: String? = null
+
+        for (arg in args) {
+            val argSplit = arg.split(":")
+            if (!argSplit[0].equals("color", ignoreCase = true)) {
+                continue
+            }
+            if (argSplit.size < 2) {
+                continue
+            }
+            color = argSplit[1].replace("#","")
+        }
+
+        color ?: return null
+
+        meta.setColor(Color.fromRGB(Integer.parseInt(color, 16)))
+
+        return Predicate {
+            val testMeta = it.itemMeta as? LeatherArmorMeta ?: return@Predicate false
+
+            color.equals(
+                Integer.toHexString(testMeta.color.red)
+                        + Integer.toHexString(testMeta.color.green)
+                        + Integer.toHexString(testMeta.color.blue),
+                ignoreCase = true
+            )
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserCustomModelData.kt

@@ -0,0 +1,33 @@
+package com.willfp.eco.internal.items
+
+import com.willfp.eco.core.items.args.LookupArgParser
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.ItemMeta
+import java.util.function.Predicate
+
+class ArgParserCustomModelData : LookupArgParser {
+    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+        var modelData: Int? = null
+
+        for (arg in args) {
+            val argSplit = arg.split(":")
+            if (!argSplit[0].equals("custom-model-data", ignoreCase = true)) {
+                continue
+            }
+            if (argSplit.size < 2) {
+                continue
+            }
+            modelData = argSplit[1].toIntOrNull()
+        }
+
+        modelData ?: return null
+
+        meta.setCustomModelData(modelData)
+
+        return Predicate {
+            val testMeta = it.itemMeta ?: return@Predicate false
+
+            testMeta.customModelData == modelData
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserEnchantment.kt

@@ -0,0 +1,55 @@
+package com.willfp.eco.internal.items
+
+import com.willfp.eco.core.fast.FastItemStack
+import com.willfp.eco.core.items.args.LookupArgParser
+import org.bukkit.NamespacedKey
+import org.bukkit.enchantments.Enchantment
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.EnchantmentStorageMeta
+import org.bukkit.inventory.meta.ItemMeta
+import java.util.function.Predicate
+
+class ArgParserEnchantment : LookupArgParser {
+    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+        val enchants = mutableMapOf<Enchantment, Int>()
+
+        for (arg in args) {
+            val argSplit = arg.split(":")
+
+            if (argSplit.size < 2) {
+                continue
+            }
+
+            val enchant = Enchantment.getByKey(NamespacedKey.minecraft(argSplit[0].lowercase()))
+            val level = argSplit[1].toIntOrNull()
+
+            if (enchant != null && level != null) {
+                enchants[enchant] = level
+            }
+        }
+
+        if (enchants.isEmpty()) {
+            return null
+        }
+
+        for ((enchant, level) in enchants) {
+            if (meta is EnchantmentStorageMeta) {
+                meta.addStoredEnchant(enchant, level, true)
+            } else {
+                meta.addEnchant(enchant, level, true)
+            }
+        }
+
+        return Predicate {
+            val onItem = FastItemStack.wrap(it).getEnchantmentsOnItem(true)
+
+            for ((enchant, level) in enchants) {
+                if ((onItem[enchant] ?: 0) < level) {
+                    return@Predicate false
+                }
+            }
+
+            true
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserFlag.kt

@@ -0,0 +1,35 @@
+package com.willfp.eco.internal.items
+
+import com.willfp.eco.core.items.args.LookupArgParser
+import org.bukkit.inventory.ItemFlag
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.ItemMeta
+import java.util.function.Predicate
+
+class ArgParserFlag : LookupArgParser {
+    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+        val flags = mutableSetOf<ItemFlag>()
+
+        for (arg in args) {
+            val flag = try {
+                ItemFlag.valueOf(arg.uppercase())
+            } catch (e: Exception) {
+                null
+            } ?: continue
+
+            flags.add(flag)
+        }
+
+        if (flags.isEmpty()) {
+            return null
+        }
+
+        meta.addItemFlags(*flags.toTypedArray())
+
+        return Predicate {
+            val testMeta = it.itemMeta ?: return@Predicate false
+
+            testMeta.itemFlags.containsAll(flags)
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserName.kt

@@ -0,0 +1,36 @@
+package com.willfp.eco.internal.items
+
+import com.willfp.eco.core.items.args.LookupArgParser
+import com.willfp.eco.util.StringUtils
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.ItemMeta
+import java.util.function.Predicate
+
+class ArgParserName : LookupArgParser {
+    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+        var name: String? = null
+
+        for (arg in args) {
+            val argSplit = arg.split(":")
+            if (!argSplit[0].equals("name", ignoreCase = true)) {
+                continue
+            }
+            if (argSplit.size < 2) {
+                continue
+            }
+            name = argSplit[1].replace("_", "")
+        }
+
+        name ?: return null
+
+        val formatted = StringUtils.format(name)
+
+        meta.setDisplayName(formatted)
+
+        return Predicate {
+            val testMeta = it.itemMeta ?: return@Predicate false
+
+            testMeta.displayName == formatted
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserTexture.kt

@@ -0,0 +1,39 @@
+package com.willfp.eco.internal.items
+
+import com.willfp.eco.core.items.args.LookupArgParser
+import com.willfp.eco.util.SkullUtils
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.ItemMeta
+import org.bukkit.inventory.meta.SkullMeta
+import java.util.function.Predicate
+
+class ArgParserTexture : LookupArgParser {
+    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+        if (meta !is SkullMeta) {
+            return null
+        }
+
+        var texture: String? = null
+
+        for (arg in args) {
+            val argSplit = arg.split(":")
+            if (!argSplit[0].equals("texture", ignoreCase = true)) {
+                continue
+            }
+            if (argSplit.size < 2) {
+                continue
+            }
+            texture = argSplit[1]
+        }
+
+        texture ?: return null
+
+        SkullUtils.setSkullTexture(meta, texture)
+
+        return Predicate {
+            val testMeta = it.itemMeta as? SkullMeta ?: return@Predicate false
+
+            texture == SkullUtils.getSkullTexture(testMeta)
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/items/ArgParserUnbreakable.kt

@@ -0,0 +1,30 @@
+package com.willfp.eco.internal.items
+
+import com.willfp.eco.core.items.args.LookupArgParser
+import org.bukkit.inventory.ItemStack
+import org.bukkit.inventory.meta.ItemMeta
+import java.util.function.Predicate
+
+class ArgParserUnbreakable : LookupArgParser {
+    override fun parseArguments(args: Array<out String>, meta: ItemMeta): Predicate<ItemStack>? {
+        var unbreakable = false
+
+        for (arg in args) {
+            if (arg.equals("unbreakable", true)) {
+                unbreakable = true
+            }
+        }
+
+        if (!unbreakable) {
+            return null
+        }
+
+        meta.isUnbreakable = true
+
+        return Predicate {
+            val testMeta = it.itemMeta ?: return@Predicate false
+
+            testMeta.isUnbreakable
+        }
+    }
+}

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/proxy/EcoProxyFactory.kt

@@ -1,7 +1,6 @@
 package com.willfp.eco.internal.proxy
 
 import com.willfp.eco.core.EcoPlugin
-import com.willfp.eco.core.proxy.AbstractProxy
 import com.willfp.eco.core.proxy.ProxyConstants
 import com.willfp.eco.core.proxy.ProxyFactory
 import com.willfp.eco.core.proxy.exceptions.ProxyError
@@ -13,9 +12,9 @@ class EcoProxyFactory(
     private val plugin: EcoPlugin
 ) : ProxyFactory {
     private val proxyClassLoader: ClassLoader = plugin::class.java.classLoader
-    private val cache: MutableMap<Class<out AbstractProxy>, AbstractProxy> = IdentityHashMap()
+    private val cache: MutableMap<Class<out Any>, Any> = IdentityHashMap()
 
-    override fun <T : AbstractProxy> getProxy(proxyClass: Class<T>): T {
+    override fun <T : Any> getProxy(proxyClass: Class<T>): T {
         try {
             val cachedProxy: T? = attemptCache(proxyClass)
             if (cachedProxy != null) {
@@ -53,7 +52,7 @@ class EcoProxyFactory(
         }
     }
 
-    private fun <T : AbstractProxy> attemptCache(proxyClass: Class<T>): T? {
+    private fun <T : Any> attemptCache(proxyClass: Class<T>): T? {
         val proxy = cache[proxyClass] ?: return null
 
         if (proxyClass.isInstance(proxy)) {
@@ -74,7 +73,8 @@ class EcoProxyFactory(
     companion object {
         val SUPPORTED_VERSIONS = listOf(
             "v1_16_R3",
-            "v1_17_R1"
+            "v1_17_R1",
+            "v1_18_R1"
         )
     }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/requirement/requirements/RequirementPlaceholderGreaterThan.kt

@@ -15,6 +15,6 @@ class RequirementPlaceholderGreaterThan : Requirement() {
 
         val placeholder = args[0]
         val equals = args[1].toDoubleOrNull() ?: return false
-        return PlaceholderManager.translatePlaceholders(placeholder, player).toDoubleOrNull() ?: 0.0 >= equals
+        return (PlaceholderManager.translatePlaceholders(placeholder, player).toDoubleOrNull() ?: 0.0) >= equals
     }
 }

eco-core/core-backend/src/main/kotlin/com/willfp/eco/internal/requirement/requirements/RequirementPlaceholderLessThan.kt

@@ -15,6 +15,6 @@ class RequirementPlaceholderLessThan : Requirement() {
 
         val placeholder = args[0]
         val equals = args[1].toDoubleOrNull() ?: return false
-        return PlaceholderManager.translatePlaceholders(placeholder, player).toDoubleOrNull() ?: 0.0 < equals
+        return (PlaceholderManager.translatePlaceholders(placeholder, player).toDoubleOrNull() ?: 0.0) < equals
     }
 }

eco-core/core-nms/build.gradle

@@ -1,10 +0,0 @@
-group 'com.willfp'
-version rootProject.version
-
-subprojects {
-    dependencies {
-        compileOnly project(':eco-core:core-proxy')
-        compileOnly project(':eco-core:core-plugin')
-        compileOnly project(':eco-core:core-backend')
-    }
-}