diff --git a/src/main/java/ru/nanit/limbo/configuration/SocketAddressSerializer.java b/src/main/java/ru/nanit/limbo/configuration/SocketAddressSerializer.java
index f5ff626..613f9c2 100644
--- a/src/main/java/ru/nanit/limbo/configuration/SocketAddressSerializer.java
+++ b/src/main/java/ru/nanit/limbo/configuration/SocketAddressSerializer.java
@@ -2,6 +2,7 @@ package ru.nanit.limbo.configuration;
 
 import org.checkerframework.checker.nullness.qual.Nullable;
 import org.spongepowered.configurate.ConfigurationNode;
+import org.spongepowered.configurate.serialize.SerializationException;
 import org.spongepowered.configurate.serialize.TypeSerializer;
 
 import java.lang.reflect.Type;
diff --git a/src/main/java/ru/nanit/limbo/connection/ClientConnection.java b/src/main/java/ru/nanit/limbo/connection/ClientConnection.java
index a7db176..d6a3286 100644
--- a/src/main/java/ru/nanit/limbo/connection/ClientConnection.java
+++ b/src/main/java/ru/nanit/limbo/connection/ClientConnection.java
@@ -112,7 +112,8 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
     }
 
     public void handlePacket(Object packet) {
-        if (packet instanceof PacketHandshake handshake) {
+        if (packet instanceof PacketHandshake) {
+            PacketHandshake handshake = (PacketHandshake) packet;
             clientVersion = handshake.getVersion();
 
             updateStateAndVersion(handshake.getNextState(), clientVersion);
@@ -177,7 +178,8 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
             return;
         }
 
-        if (packet instanceof PacketLoginPluginResponse response) {
+        if (packet instanceof PacketLoginPluginResponse) {
+            PacketLoginPluginResponse response = (PacketLoginPluginResponse) packet;
 
             if (server.getConfig().getInfoForwarding().isModern()
                     && response.getMessageId() == velocityLoginMessageId) {
@@ -319,7 +321,8 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         String token = null;
 
         for (Object obj : arr) {
-            if (obj instanceof JsonObject prop) {
+            if (obj instanceof JsonObject) {
+                JsonObject prop = (JsonObject) obj;
                 if (prop.getString("name").equals("bungeeguard-token")) {
                     token = prop.getString("value");
                     break;
diff --git a/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketTitleLegacy.java b/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketTitleLegacy.java
index 3a450cf..cb7458f 100644
--- a/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketTitleLegacy.java
+++ b/src/main/java/ru/nanit/limbo/protocol/packets/play/PacketTitleLegacy.java
@@ -35,9 +35,15 @@ public class PacketTitleLegacy implements PacketOut {
         msg.writeVarInt(action.getId(version));
 
         switch (action) {
-            case SET_TITLE -> title.encode(msg, version);
-            case SET_SUBTITLE -> subtitle.encode(msg, version);
-            case SET_TIMES_AND_DISPLAY -> times.encode(msg, version);
+            case SET_TITLE:
+                title.encode(msg, version);
+                break;
+            case SET_SUBTITLE:
+                subtitle.encode(msg, version);
+                break;
+            case SET_TIMES_AND_DISPLAY:
+                times.encode(msg, version);
+                break;
         }
     }
 
diff --git a/src/main/java/ru/nanit/limbo/util/Logger.java b/src/main/java/ru/nanit/limbo/util/Logger.java
index 2f3edbb..c327851 100644
--- a/src/main/java/ru/nanit/limbo/util/Logger.java
+++ b/src/main/java/ru/nanit/limbo/util/Logger.java
@@ -44,7 +44,7 @@ public final class Logger {
 
     public static void print(Level level, Object msg, Throwable t, Object... args) {
         if (debugLevel >= level.getIndex()) {
-            System.out.printf("%s: %s%n", getPrefix(level), String.format(msg.toString(), args));
+            System.out.println(String.format("%s: %s", getPrefix(level), String.format(msg.toString(), args)));
             if (t != null) t.printStackTrace();
         }
     }
diff --git a/src/main/java/ru/nanit/limbo/world/DimensionRegistry.java b/src/main/java/ru/nanit/limbo/world/DimensionRegistry.java
index 52ea418..8c34880 100644
--- a/src/main/java/ru/nanit/limbo/world/DimensionRegistry.java
+++ b/src/main/java/ru/nanit/limbo/world/DimensionRegistry.java
@@ -47,13 +47,19 @@ public final class DimensionRegistry {
         CompoundBinaryTag theEnd = (CompoundBinaryTag) ((CompoundBinaryTag) dimensions.get(3)).get("element");
 
         switch (def.toLowerCase()) {
-            case "overworld" -> defaultDimension = new Dimension(0, "minecraft:overworld", overWorld);
-            case "nether" -> defaultDimension = new Dimension(-1, "minecraft:nether", nether);
-            case "the_end" -> defaultDimension = new Dimension(1, "minecraft:the_end", theEnd);
-            default -> {
+            case "overworld":
+                defaultDimension = new Dimension(0, "minecraft:overworld", overWorld);
+                break;
+            case "nether":
+                defaultDimension = new Dimension(-1, "minecraft:nether", nether);
+                break;
+            case "the_end":
+                defaultDimension = new Dimension(1, "minecraft:the_end", theEnd);
+                break;
+            default:
                 defaultDimension = new Dimension(1, "minecraft:the_end", theEnd);
                 Logger.warning("Undefined dimension type: '%s'. Using THE_END as default", def);
-            }
+                break;
         }
     }