diff --git a/sources/src/main/java/io/akarin/server/mixin/bootstrap/Bootstrap.java b/sources/src/main/java/io/akarin/server/mixin/bootstrap/Bootstrap.java
index ffe2da92c..24751302f 100644
--- a/sources/src/main/java/io/akarin/server/mixin/bootstrap/Bootstrap.java
+++ b/sources/src/main/java/io/akarin/server/mixin/bootstrap/Bootstrap.java
@@ -14,7 +14,7 @@ import io.akarin.api.internal.Akari;
 import io.akarin.server.core.AkarinGlobalConfig;
 
 @Mixin(value = Main.class, remap = false)
-public class Bootstrap {
+public abstract class Bootstrap {
     @Inject(method = "main([Ljava/lang/String;)V", at = @At("HEAD"))
     private static void premain(CallbackInfo info) {
         AkarinGlobalConfig.init(new File("akarin.yml"));
diff --git a/sources/src/main/java/io/akarin/server/mixin/bootstrap/DummyEula.java b/sources/src/main/java/io/akarin/server/mixin/bootstrap/DummyEula.java
index 1598cbf27..0b6b2f0db 100644
--- a/sources/src/main/java/io/akarin/server/mixin/bootstrap/DummyEula.java
+++ b/sources/src/main/java/io/akarin/server/mixin/bootstrap/DummyEula.java
@@ -7,7 +7,7 @@ import org.spongepowered.asm.mixin.Overwrite;
 import net.minecraft.server.EULA;
 
 @Mixin(value = EULA.class, remap = false)
-public class DummyEula {
+public abstract class DummyEula {
     /**
      * Read then check the EULA file <i>formerly</i>
      * @param file
diff --git a/sources/src/main/java/io/akarin/server/mixin/bootstrap/MetricsBootstrap.java b/sources/src/main/java/io/akarin/server/mixin/bootstrap/MetricsBootstrap.java
index 6ff1892c2..aff6d21c4 100644
--- a/sources/src/main/java/io/akarin/server/mixin/bootstrap/MetricsBootstrap.java
+++ b/sources/src/main/java/io/akarin/server/mixin/bootstrap/MetricsBootstrap.java
@@ -14,7 +14,7 @@ import com.destroystokyo.paper.Metrics;
 import net.minecraft.server.MinecraftServer;
 
 @Mixin(targets = "com.destroystokyo.paper.Metrics$PaperMetrics", remap = false)
-public class MetricsBootstrap {
+public abstract class MetricsBootstrap {
     @Overwrite
     static void startMetrics() {
         // Get the config file
diff --git a/sources/src/main/java/io/akarin/server/mixin/bootstrap/MixinMetrics.java b/sources/src/main/java/io/akarin/server/mixin/bootstrap/MixinMetrics.java
index 0b77f3c23..66d6be309 100644
--- a/sources/src/main/java/io/akarin/server/mixin/bootstrap/MixinMetrics.java
+++ b/sources/src/main/java/io/akarin/server/mixin/bootstrap/MixinMetrics.java
@@ -17,7 +17,7 @@ import com.destroystokyo.paper.Metrics;
 import com.destroystokyo.paper.Metrics.CustomChart;
 
 @Mixin(value = Metrics.class, remap = false)
-public class MixinMetrics {
+public abstract class MixinMetrics {
     // The url to which the data is sent - bukkit/Torch (keep our old name)
     private final static String URL = "https://bStats.org/submitData/bukkit";
     
diff --git a/sources/src/main/java/io/akarin/server/mixin/bootstrap/ParallelRegistry.java b/sources/src/main/java/io/akarin/server/mixin/bootstrap/ParallelRegistry.java
index fcafd087d..8a899b9c1 100644
--- a/sources/src/main/java/io/akarin/server/mixin/bootstrap/ParallelRegistry.java
+++ b/sources/src/main/java/io/akarin/server/mixin/bootstrap/ParallelRegistry.java
@@ -24,7 +24,7 @@ import net.minecraft.server.PotionRegistry;
 import net.minecraft.server.SoundEffect;
 
 @Mixin(value = DispenserRegistry.class, remap = false)
-public class ParallelRegistry {
+public abstract class ParallelRegistry {
     /**
      * Registry order: SoundEffect -> Block
      */
diff --git a/sources/src/main/java/io/akarin/server/mixin/bootstrap/Watchcat.java b/sources/src/main/java/io/akarin/server/mixin/bootstrap/Watchcat.java
index 4deb6dbd4..60dc41f72 100644
--- a/sources/src/main/java/io/akarin/server/mixin/bootstrap/Watchcat.java
+++ b/sources/src/main/java/io/akarin/server/mixin/bootstrap/Watchcat.java
@@ -21,7 +21,7 @@ import io.akarin.server.core.AkarinGlobalConfig;
 import net.minecraft.server.MinecraftServer;
 
 @Mixin(value = WatchdogThread.class, remap = false)
-public class Watchcat extends Thread {
+public abstract class Watchcat extends Thread {
     @Shadow private static WatchdogThread instance;
     @Shadow private @Final long timeoutTime;
     @Shadow private @Final boolean restart;
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/MixinAsyncCatcher.java b/sources/src/main/java/io/akarin/server/mixin/core/MixinAsyncCatcher.java
index 4785d88fb..f23c59ce0 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/MixinAsyncCatcher.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/MixinAsyncCatcher.java
@@ -10,7 +10,7 @@ import io.akarin.server.core.AkarinGlobalConfig;
 import net.minecraft.server.MinecraftServer;
 
 @Mixin(value = AsyncCatcher.class, remap = false)
-public class MixinAsyncCatcher {
+public abstract class MixinAsyncCatcher {
     @Shadow public static boolean enabled;
     
     @Overwrite
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/MixinChunkIOExecutor.java b/sources/src/main/java/io/akarin/server/mixin/core/MixinChunkIOExecutor.java
index 0b6603e43..5b33d2bdf 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/MixinChunkIOExecutor.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/MixinChunkIOExecutor.java
@@ -12,7 +12,7 @@ import io.akarin.server.core.AkarinGlobalConfig;
 import net.minecraft.server.Chunk;
 
 @Mixin(value = ChunkIOExecutor.class, remap = false)
-public class MixinChunkIOExecutor {
+public abstract class MixinChunkIOExecutor {
     @Shadow @Final static int BASE_THREADS;
     @Shadow @Mutable @Final static int PLAYERS_PER_THREAD;
     @Shadow @Final private static AsynchronousExecutor<?, Chunk, Runnable, RuntimeException> instance;
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java b/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java
index c8961292f..e6bf75f1e 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/MixinVersionCommand.java
@@ -14,7 +14,7 @@ import io.akarin.server.core.AkarinGlobalConfig;
 import net.minecraft.server.MCUtil;
 
 @Mixin(value = VersionCommand.class, remap = false)
-public class MixinVersionCommand {
+public abstract class MixinVersionCommand {
     @Shadow private static int getFromRepo(String repo, String hash) { return 0; }
     
     /**
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/MixinWorldServer.java b/sources/src/main/java/io/akarin/server/mixin/core/MixinWorldServer.java
index 191f80b68..20b82c46f 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/MixinWorldServer.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/MixinWorldServer.java
@@ -7,7 +7,7 @@ import org.spongepowered.asm.mixin.injection.Redirect;
 import net.minecraft.server.WorldServer;
 
 @Mixin(value = WorldServer.class, remap = false)
-public class MixinWorldServer {
+public abstract class MixinWorldServer {
     @Redirect(method = "doTick", at = @At(
             value = "INVOKE",
             target = "net/minecraft/server/PlayerChunkMap.flush()V"
diff --git a/sources/src/main/java/io/akarin/server/mixin/core/MonsterEggGuardian.java b/sources/src/main/java/io/akarin/server/mixin/core/MonsterEggGuardian.java
index fcc1a7a45..d7c7e7307 100644
--- a/sources/src/main/java/io/akarin/server/mixin/core/MonsterEggGuardian.java
+++ b/sources/src/main/java/io/akarin/server/mixin/core/MonsterEggGuardian.java
@@ -11,7 +11,7 @@ import net.minecraft.server.Blocks;
 import net.minecraft.server.ItemMonsterEgg;
 
 @Mixin(value = ItemMonsterEgg.class, remap = false)
-public class MonsterEggGuardian {
+public abstract class MonsterEggGuardian {
     @Redirect(method = "a", at = @At(
             value = "FIELD",
             target = "net/minecraft/server/Blocks.MOB_SPAWNER:Lnet/minecraft/server/Block;",
diff --git a/sources/src/main/java/io/akarin/server/mixin/cps/MixinCraftWorld.java b/sources/src/main/java/io/akarin/server/mixin/cps/MixinCraftWorld.java
index 39ce2aafc..04a28cc77 100644
--- a/sources/src/main/java/io/akarin/server/mixin/cps/MixinCraftWorld.java
+++ b/sources/src/main/java/io/akarin/server/mixin/cps/MixinCraftWorld.java
@@ -12,7 +12,7 @@ import org.spongepowered.asm.mixin.injection.Redirect;
 import net.minecraft.server.WorldServer;
 
 @Mixin(value = CraftWorld.class, remap = false)
-public class MixinCraftWorld {
+public abstract class MixinCraftWorld {
     @Shadow @Final private WorldServer world;
     
     @Redirect(method = "processChunkGC()V", at = @At(
diff --git a/sources/src/main/java/io/akarin/server/mixin/lighting/MixinChunkProviderServer.java b/sources/src/main/java/io/akarin/server/mixin/lighting/MixinChunkProviderServer.java
index 61fff71e5..aa384fcba 100644
--- a/sources/src/main/java/io/akarin/server/mixin/lighting/MixinChunkProviderServer.java
+++ b/sources/src/main/java/io/akarin/server/mixin/lighting/MixinChunkProviderServer.java
@@ -35,7 +35,7 @@ import net.minecraft.server.ChunkProviderServer;
 import net.minecraft.server.WorldServer;
 
 @Mixin(value = ChunkProviderServer.class, remap = false, priority = 1001)
-public class MixinChunkProviderServer {
+public abstract class MixinChunkProviderServer {
     @Shadow @Final public WorldServer world;
 
     @Redirect(method = "unloadChunks", at = @At(
diff --git a/sources/src/main/java/io/akarin/server/mixin/nsc/NonblockingServerConnection.java b/sources/src/main/java/io/akarin/server/mixin/nsc/NonblockingServerConnection.java
index 41de9c1de..af54f2f03 100644
--- a/sources/src/main/java/io/akarin/server/mixin/nsc/NonblockingServerConnection.java
+++ b/sources/src/main/java/io/akarin/server/mixin/nsc/NonblockingServerConnection.java
@@ -17,7 +17,6 @@ import org.spongepowered.asm.mixin.Overwrite;
 import org.spongepowered.asm.mixin.Shadow;
 import com.google.common.collect.Lists;
 
-import io.akarin.api.internal.Akari;
 import io.akarin.api.internal.LocalAddress;
 import io.akarin.server.core.AkarinGlobalConfig;
 import io.akarin.server.core.ChannelAdapter;
@@ -37,7 +36,7 @@ import net.minecraft.server.PacketPlayOutKickDisconnect;
 import net.minecraft.server.ServerConnection;
 
 @Mixin(value = ServerConnection.class, remap = false)
-public class NonblockingServerConnection {
+public abstract class NonblockingServerConnection {
     private final static Logger logger = LogManager.getLogger("NSC");
     
     /**
diff --git a/sources/src/main/java/io/akarin/server/mixin/optimization/MixinPlayerChunk.java b/sources/src/main/java/io/akarin/server/mixin/optimization/MixinPlayerChunk.java
index b8baa94c6..b0887c78e 100644
--- a/sources/src/main/java/io/akarin/server/mixin/optimization/MixinPlayerChunk.java
+++ b/sources/src/main/java/io/akarin/server/mixin/optimization/MixinPlayerChunk.java
@@ -15,7 +15,7 @@ import net.minecraft.server.EntityPlayer;
 import net.minecraft.server.PlayerChunk;
 
 @Mixin(value = PlayerChunk.class, remap = false)
-public class MixinPlayerChunk {
+public abstract class MixinPlayerChunk {
     @Shadow @Final public List<EntityPlayer> c; // PAIL: players
     
     @Inject(method = "b", at = @At(
diff --git a/sources/src/main/java/io/akarin/server/mixin/optimization/MixinTileEntityEnchantTable.java b/sources/src/main/java/io/akarin/server/mixin/optimization/MixinTileEntityEnchantTable.java
index b6779b0a9..f5fedc9ae 100644
--- a/sources/src/main/java/io/akarin/server/mixin/optimization/MixinTileEntityEnchantTable.java
+++ b/sources/src/main/java/io/akarin/server/mixin/optimization/MixinTileEntityEnchantTable.java
@@ -5,7 +5,7 @@ import org.spongepowered.asm.mixin.Overwrite;
 import net.minecraft.server.TileEntityEnchantTable;
 
 @Mixin(value = TileEntityEnchantTable.class, remap = false)
-public class MixinTileEntityEnchantTable {
+public abstract class MixinTileEntityEnchantTable {
     @Overwrite
     public void e() {} // No tickable
 }
diff --git a/sources/src/main/java/io/akarin/server/mixin/optimization/PandaRedstoneWire.java b/sources/src/main/java/io/akarin/server/mixin/optimization/PandaRedstoneWire.java
index d1cb5e70d..8204490fb 100644
--- a/sources/src/main/java/io/akarin/server/mixin/optimization/PandaRedstoneWire.java
+++ b/sources/src/main/java/io/akarin/server/mixin/optimization/PandaRedstoneWire.java
@@ -7,7 +7,6 @@ import java.util.Set;
 import javax.annotation.Nullable;
 
 import org.apache.commons.lang3.ArrayUtils;
-import org.bukkit.event.Event;
 import org.bukkit.event.block.BlockRedstoneEvent;
 import org.spongepowered.asm.mixin.Mixin;
 import org.spongepowered.asm.mixin.Overwrite;
diff --git a/sources/src/main/java/io/akarin/server/mixin/optimization/WeakEnchantmentManager.java b/sources/src/main/java/io/akarin/server/mixin/optimization/WeakEnchantmentManager.java
index bdcebb082..23718cedb 100644
--- a/sources/src/main/java/io/akarin/server/mixin/optimization/WeakEnchantmentManager.java
+++ b/sources/src/main/java/io/akarin/server/mixin/optimization/WeakEnchantmentManager.java
@@ -40,7 +40,7 @@ import net.minecraft.server.ItemStack;
  * Fixes MC-128547(https://bugs.mojang.com/browse/MC-128547)
  */
 @Mixin(value = EnchantmentManager.class, remap = false)
-public class WeakEnchantmentManager {
+public abstract class WeakEnchantmentManager {
     @Shadow(aliases = "a") @Final private static EnchantmentManager.EnchantmentModifierProtection protection;
     @Shadow(aliases = "c") @Final private static EnchantmentManager.EnchantmentModifierThorns thorns;
     @Shadow(aliases = "d") @Final private static EnchantmentManager.EnchantmentModifierArthropods arthropods;
diff --git a/sources/src/main/java/io/akarin/server/mixin/realtime/MixinWorld.java b/sources/src/main/java/io/akarin/server/mixin/realtime/MixinWorld.java
index bfec6c590..9905faecf 100644
--- a/sources/src/main/java/io/akarin/server/mixin/realtime/MixinWorld.java
+++ b/sources/src/main/java/io/akarin/server/mixin/realtime/MixinWorld.java
@@ -1,3 +1,27 @@
+/*
+ * This file is part of Sponge, licensed under the MIT License (MIT).
+ *
+ * Copyright (c) SpongePowered <https://www.spongepowered.org>
+ * Copyright (c) contributors
+ *
+ * Permission is hereby granted, free of charge, to any person obtaining a copy
+ * of this software and associated documentation files (the "Software"), to deal
+ * in the Software without restriction, including without limitation the rights
+ * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+ * copies of the Software, and to permit persons to whom the Software is
+ * furnished to do so, subject to the following conditions:
+ *
+ * The above copyright notice and this permission notice shall be included in
+ * all copies or substantial portions of the Software.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+ * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+ * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+ * THE SOFTWARE.
+ */
 package io.akarin.server.mixin.realtime;
 
 import javax.annotation.Nullable;