diff --git a/bukkit-legacy/src/main/java/com/viaversion/viaversion/bukkit/util/CollisionChecker.java b/bukkit-legacy/src/main/java/com/viaversion/viaversion/bukkit/util/CollisionChecker.java
index 5220aa2d1..9ce05d468 100644
--- a/bukkit-legacy/src/main/java/com/viaversion/viaversion/bukkit/util/CollisionChecker.java
+++ b/bukkit-legacy/src/main/java/com/viaversion/viaversion/bukkit/util/CollisionChecker.java
@@ -106,7 +106,7 @@ public class CollisionChecker {
     }
 
     private static class DummyList<T> extends AbstractList<T> {
-        private boolean any = false;
+        private boolean any;
 
         @Override
         public T get(int index) {
diff --git a/bukkit/src/main/java/com/viaversion/viaversion/bukkit/providers/BukkitInventoryQuickMoveProvider.java b/bukkit/src/main/java/com/viaversion/viaversion/bukkit/providers/BukkitInventoryQuickMoveProvider.java
index f4ad544a5..11d432118 100644
--- a/bukkit/src/main/java/com/viaversion/viaversion/bukkit/providers/BukkitInventoryQuickMoveProvider.java
+++ b/bukkit/src/main/java/com/viaversion/viaversion/bukkit/providers/BukkitInventoryQuickMoveProvider.java
@@ -199,10 +199,6 @@ public class BukkitInventoryQuickMoveProvider extends InventoryQuickMoveProvider
 
     private boolean isSupported() {
         int protocolId = Via.getAPI().getServerVersion().lowestSupportedVersion();
-        if (protocolId >= ProtocolVersion.v1_8.getVersion() && protocolId <= ProtocolVersion.v1_11_1.getVersion()) {
-            return true; // 1.8-1.11.2
-        }
-        // this is not needed on 1.12+ servers
-        return false;
+        return protocolId >= ProtocolVersion.v1_8.getVersion() && protocolId <= ProtocolVersion.v1_11_1.getVersion(); // 1.8-1.11.2, not needed with 1.12
     }
 }
\ No newline at end of file
diff --git a/common/src/main/java/com/viaversion/viaversion/legacy/bossbar/CommonBoss.java b/common/src/main/java/com/viaversion/viaversion/legacy/bossbar/CommonBoss.java
index 2f69eb4dd..a3ac22416 100644
--- a/common/src/main/java/com/viaversion/viaversion/legacy/bossbar/CommonBoss.java
+++ b/common/src/main/java/com/viaversion/viaversion/legacy/bossbar/CommonBoss.java
@@ -31,6 +31,7 @@ import com.viaversion.viaversion.protocols.protocol1_9to1_8.ClientboundPackets1_
 import com.viaversion.viaversion.protocols.protocol1_9to1_8.Protocol1_9To1_8;
 import java.util.ArrayList;
 import java.util.Collections;
+import java.util.EnumSet;
 import java.util.HashSet;
 import java.util.Map;
 import java.util.Set;
@@ -56,7 +57,7 @@ public class CommonBoss implements BossBar {
         this.color = color == null ? BossColor.PURPLE : color;
         this.style = style == null ? BossStyle.SOLID : style;
         this.connections = new MapMaker().weakValues().makeMap();
-        this.flags = new HashSet<>();
+        this.flags = EnumSet.noneOf(BossFlag.class);
         this.visible = true;
     }
 
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_11to1_10/BlockEntityRewriter.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_11to1_10/BlockEntityRewriter.java
index 06fa8f843..336929692 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_11to1_10/BlockEntityRewriter.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_11to1_10/BlockEntityRewriter.java
@@ -22,7 +22,7 @@ import com.google.common.collect.HashBiMap;
 import com.viaversion.viaversion.util.Key;
 
 public class BlockEntityRewriter {
-    private static BiMap<String, String> oldToNewNames = HashBiMap.create();
+    private static final BiMap<String, String> OLD_TO_NEW_NAMES = HashBiMap.create();
 
     // Source: https://www.minecraftforum.net/forums/minecraft-java-edition/redstone-discussion-and/commands-command-blocks-and/2724507-1-11-nbt-changes-and-additions#AllTiles
     static {
@@ -52,15 +52,15 @@ public class BlockEntityRewriter {
     }
 
     private static void rewrite(String oldName, String newName) {
-        oldToNewNames.put(oldName, Key.namespaced(newName));
+        OLD_TO_NEW_NAMES.put(oldName, Key.namespaced(newName));
     }
 
     public static BiMap<String, String> inverse() {
-        return oldToNewNames.inverse();
+        return OLD_TO_NEW_NAMES.inverse();
     }
 
     public static String toNewIdentifier(String oldId) {
-        String newName = oldToNewNames.get(oldId);
+        String newName = OLD_TO_NEW_NAMES.get(oldId);
         if (newName != null) {
             return newName;
         }
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/AbstractFenceConnectionHandler.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/AbstractFenceConnectionHandler.java
index c50595e0b..f6a411cf8 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/AbstractFenceConnectionHandler.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/AbstractFenceConnectionHandler.java
@@ -36,7 +36,7 @@ public abstract class AbstractFenceConnectionHandler extends ConnectionHandler {
         Arrays.fill(connectedBlockStates, -1);
     }
 
-    public ConnectionData.ConnectorInitAction getInitAction(final String key) {
+    ConnectionData.ConnectorInitAction getInitAction(final String key) {
         final AbstractFenceConnectionHandler handler = this;
         return blockData -> {
             if (key.equals(blockData.getMinecraftKey())) {
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/AbstractStempConnectionHandler.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/AbstractStempConnectionHandler.java
index 75d883958..22717e18b 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/AbstractStempConnectionHandler.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/AbstractStempConnectionHandler.java
@@ -38,7 +38,7 @@ public abstract class AbstractStempConnectionHandler extends ConnectionHandler {
         this.baseStateId = ConnectionData.getId(baseStateId);
     }
 
-    public ConnectionData.ConnectorInitAction getInitAction(final String blockId, final String toKey) {
+    ConnectionData.ConnectorInitAction getInitAction(final String blockId, final String toKey) {
         final AbstractStempConnectionHandler handler = this;
         return blockData -> {
             if (blockData.getSavedBlockStateId() == baseStateId || blockId.equals(blockData.getMinecraftKey())) {
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/ChorusPlantConnectionHandler.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/ChorusPlantConnectionHandler.java
index f2413ff4f..af5dd0161 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/ChorusPlantConnectionHandler.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/ChorusPlantConnectionHandler.java
@@ -39,7 +39,7 @@ public class ChorusPlantConnectionHandler extends AbstractFenceConnectionHandler
         endstone = ConnectionData.getId("minecraft:end_stone");
     }
 
-    public ConnectionData.ConnectorInitAction getExtraAction() {
+    private ConnectionData.ConnectorInitAction getExtraAction() {
         return blockData -> {
             if (blockData.getMinecraftKey().equals("minecraft:chorus_flower")) {
                 getBlockStates().add(blockData.getSavedBlockStateId());
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/RedstoneConnectionHandler.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/RedstoneConnectionHandler.java
index 3a9d1f369..592b6c6c7 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/RedstoneConnectionHandler.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/blockconnections/RedstoneConnectionHandler.java
@@ -59,13 +59,12 @@ public class RedstoneConnectionHandler extends ConnectionHandler {
     private static int getState(String value) {
         switch (value) {
             case "none":
+            default:
                 return 0;
             case "side":
                 return 1;
             case "up":
                 return 2;
-            default:
-                return 0;
         }
     }
 
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/data/ParticleRewriter.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/data/ParticleRewriter.java
index c8c176cc0..21c6a37ec 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/data/ParticleRewriter.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/data/ParticleRewriter.java
@@ -99,7 +99,7 @@ public class ParticleRewriter {
         }
 
         NewParticle rewrite = particles.get(particleId);
-        return rewrite.handle(new Particle(rewrite.getId()), data);
+        return rewrite.handle(new Particle(rewrite.id()), data);
     }
 
     private static void add(int newId) {
@@ -157,6 +157,7 @@ public class ParticleRewriter {
         };
     }
 
+    @FunctionalInterface
     interface ParticleDataHandler {
         Particle handler(Particle particle, Integer[] data);
     }
@@ -176,11 +177,11 @@ public class ParticleRewriter {
             return particle;
         }
 
-        public int getId() {
+        public int id() {
             return id;
         }
 
-        public ParticleDataHandler getHandler() {
+        public ParticleDataHandler handler() {
             return handler;
         }
     }
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/data/RecipeData.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/data/RecipeData.java
index 981e115e1..3b5e0d048 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/data/RecipeData.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_13to1_12_2/data/RecipeData.java
@@ -31,20 +31,16 @@ public class RecipeData {
     public static void init() {
         InputStream stream = MappingData.class.getClassLoader()
                 .getResourceAsStream("assets/viaversion/data/itemrecipes1_12_2to1_13.json");
-        InputStreamReader reader = new InputStreamReader(stream);
-        try {
+        try (InputStreamReader reader = new InputStreamReader(stream)) {
             recipes = GsonUtil.getGson().fromJson(
                     reader,
                     new TypeToken<Map<String, Recipe>>() {
                     }.getType()
             );
-        } finally {
-            try {
-                reader.close();
-            } catch (IOException ignored) {
-                // Ignored
-            }
+        } catch (IOException e) {
+            throw new RuntimeException(e);
         }
+        // Ignored
     }
 
     public static class Recipe {
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16to1_15_2/storage/InventoryTracker1_16.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16to1_15_2/storage/InventoryTracker1_16.java
index 287bd3b05..7a6a7e7cd 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16to1_15_2/storage/InventoryTracker1_16.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_16to1_15_2/storage/InventoryTracker1_16.java
@@ -20,7 +20,7 @@ package com.viaversion.viaversion.protocols.protocol1_16to1_15_2.storage;
 import com.viaversion.viaversion.api.connection.StorableObject;
 
 public class InventoryTracker1_16 implements StorableObject {
-    private boolean inventoryOpen = false;
+    private boolean inventoryOpen;
 
     public boolean isInventoryOpen() {
         return inventoryOpen;
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_19to1_18_2/Protocol1_19To1_18_2.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_19to1_18_2/Protocol1_19To1_18_2.java
index 9762ac282..b50b492f1 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_19to1_18_2/Protocol1_19To1_18_2.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_19to1_18_2/Protocol1_19To1_18_2.java
@@ -61,7 +61,7 @@ public final class Protocol1_19To1_18_2 extends AbstractProtocol<ClientboundPack
     }
 
     public static boolean isTextComponentNull(final JsonElement element) {
-        return element == null || element.isJsonNull() || (element.isJsonArray() && element.getAsJsonArray().size() == 0);
+        return element == null || element.isJsonNull() || (element.isJsonArray() && element.getAsJsonArray().isEmpty());
     }
 
     public static JsonElement mapTextComponentIfNull(JsonElement component) {
@@ -126,9 +126,7 @@ public final class Protocol1_19To1_18_2 extends AbstractProtocol<ClientboundPack
 
         new StatisticsRewriter<>(this).register(ClientboundPackets1_18.STATISTICS);
 
-        final PacketHandler singleNullTextComponentMapper = wrapper -> {
-            wrapper.write(Type.COMPONENT, mapTextComponentIfNull(wrapper.read(Type.COMPONENT)));
-        };
+        final PacketHandler singleNullTextComponentMapper = wrapper -> wrapper.write(Type.COMPONENT, mapTextComponentIfNull(wrapper.read(Type.COMPONENT)));
         registerClientbound(ClientboundPackets1_18.TITLE_TEXT, singleNullTextComponentMapper);
         registerClientbound(ClientboundPackets1_18.TITLE_SUBTITLE, singleNullTextComponentMapper);
         registerClientbound(ClientboundPackets1_18.ACTIONBAR, singleNullTextComponentMapper);
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/Protocol1_9To1_8.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/Protocol1_9To1_8.java
index bae5c01fe..c40b0e824 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/Protocol1_9To1_8.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/Protocol1_9To1_8.java
@@ -98,13 +98,16 @@ public class Protocol1_9To1_8 extends AbstractProtocol<ClientboundPackets1_8, Cl
     }
 
     public static boolean isSword(int id) {
-        if (id == 267) return true; // Iron
-        if (id == 268) return true; // Wood
-        if (id == 272) return true; // Stone
-        if (id == 276) return true; // Diamond
-        if (id == 283) return true; // Gold
-
-        return false;
+        switch (id) {
+            case 267: // Iron sword
+            case 268: // Wooden sword
+            case 272: // Stone sword
+            case 276: // Diamond sword
+            case 283: // Gold sword
+                return true;
+            default:
+                return false;
+        }
     }
 
     @Override
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/metadata/MetadataRewriter1_9To1_8.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/metadata/MetadataRewriter1_9To1_8.java
index ed2e8a62c..d87fffa9f 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/metadata/MetadataRewriter1_9To1_8.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/metadata/MetadataRewriter1_9To1_8.java
@@ -72,7 +72,7 @@ public class MetadataRewriter1_9To1_8 extends EntityRewriter<ClientboundPackets1
                 }
                 // After writing the last one
                 if (metaIndex == MetaIndex.ENTITY_STATUS && type == EntityTypes1_10.EntityType.PLAYER) {
-                    Byte val = 0;
+                    byte val = 0;
                     if ((((Byte) value) & 0x10) == 0x10) { // Player eating/aiming/drinking
                         val = 1;
                     }
diff --git a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/packets/PlayerPackets.java b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/packets/PlayerPackets.java
index 6728e718f..3270f5092 100644
--- a/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/packets/PlayerPackets.java
+++ b/common/src/main/java/com/viaversion/viaversion/protocols/protocol1_9to1_8/packets/PlayerPackets.java
@@ -253,8 +253,6 @@ public class PlayerPackets {
                             String displayName = wrapper.read(Type.OPTIONAL_STRING);
                             wrapper.write(Type.OPTIONAL_COMPONENT, displayName != null ?
                                     Protocol1_9To1_8.FIX_JSON.transform(wrapper, displayName) : null);
-                        } else if (action == 4) { // remove player
-                            // no fields
                         }
                     }
                 });
diff --git a/common/src/main/java/com/viaversion/viaversion/rewriter/ItemRewriter.java b/common/src/main/java/com/viaversion/viaversion/rewriter/ItemRewriter.java
index ca43a8eb3..33dd92783 100644
--- a/common/src/main/java/com/viaversion/viaversion/rewriter/ItemRewriter.java
+++ b/common/src/main/java/com/viaversion/viaversion/rewriter/ItemRewriter.java
@@ -160,7 +160,7 @@ public class ItemRewriter<C extends ClientboundPacketType, S extends Serverbound
                         slot = wrapper.passthrough(Type.BYTE);
                         // & 0x7F into an extra variable if slot is needed
                         handleItemToClient(wrapper.passthrough(itemType));
-                    } while ((slot & 0xFFFFFF80) != 0);
+                    } while (slot < 0);
                 });
             }
         });
diff --git a/sponge/src/main/java/com/viaversion/viaversion/SpongePlugin.java b/sponge/src/main/java/com/viaversion/viaversion/SpongePlugin.java
index fb3b2565a..abb4008c7 100644
--- a/sponge/src/main/java/com/viaversion/viaversion/SpongePlugin.java
+++ b/sponge/src/main/java/com/viaversion/viaversion/SpongePlugin.java
@@ -76,7 +76,6 @@ public class SpongePlugin implements ViaPlatform<Player> {
     @ConfigDir(sharedRoot = false)
     private Path configDir;
 
-    @SuppressWarnings("SpongeInjection")
     @Inject
     SpongePlugin(final PluginContainer container, final Game game, final org.apache.logging.log4j.Logger logger) {
         this.container = container;
diff --git a/sponge/src/main/java/com/viaversion/viaversion/sponge/handlers/SpongeChannelInitializer.java b/sponge/src/main/java/com/viaversion/viaversion/sponge/handlers/SpongeChannelInitializer.java
index a25ec6ed1..29d456ba8 100644
--- a/sponge/src/main/java/com/viaversion/viaversion/sponge/handlers/SpongeChannelInitializer.java
+++ b/sponge/src/main/java/com/viaversion/viaversion/sponge/handlers/SpongeChannelInitializer.java
@@ -52,7 +52,7 @@ public class SpongeChannelInitializer extends ChannelInitializer<Channel> implem
         // Ensure ViaVersion is loaded
         if (Via.getAPI().getServerVersion().isKnown()
                 && channel instanceof SocketChannel) { // channel can be LocalChannel on internal server
-            UserConnection info = new UserConnectionImpl((SocketChannel) channel);
+            UserConnection info = new UserConnectionImpl(channel);
             // init protocol
             new ProtocolPipelineImpl(info);
             // Add originals