Fix Checkstyle errors and update geriatric Checkstyle version

api/src/main/java/com/velocitypowered/api/event/player/PlayerChannelRegisterEvent.java

@@ -3,7 +3,6 @@ package com.velocitypowered.api.event.player;
 import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.connection.Player;
 import com.velocitypowered.api.proxy.messages.ChannelIdentifier;
-
 import java.util.List;
 
 /**

api/src/main/java/com/velocitypowered/api/proxy/connection/InboundConnection.java

@@ -1,7 +1,6 @@
 package com.velocitypowered.api.proxy.connection;
 
 import com.velocitypowered.api.network.ProtocolVersion;
-
 import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 import java.util.Optional;

api/src/main/java/com/velocitypowered/api/proxy/server/ServerPing.java

@@ -11,7 +11,6 @@ import java.util.List;
 import java.util.Objects;
 import java.util.Optional;
 import java.util.UUID;
-
 import net.kyori.adventure.text.Component;
 import org.checkerframework.checker.nullness.qual.Nullable;
 

config/checkstyle/checkstyle.xml

@@ -31,6 +31,12 @@
     <property name="file" value="${configDirectory}/suppressions.xml"/>
   </module>
 
+  <module name="LineLength">
+    <property name="max" value="150"/>
+    <property name="ignorePattern"
+      value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
+  </module>
+
   <module name="TreeWalker">
     <module name="OuterTypeFilename"/>
     <!-- <module name="IllegalTokenText">
@@ -45,11 +51,6 @@
       <property name="allowByTailComment" value="true"/>
       <property name="allowNonPrintableEscapes" value="true"/>
     </module>
-    <module name="LineLength">
-      <property name="max" value="150"/>
-      <property name="ignorePattern"
-        value="^package.*|^import.*|a href|href|http://|https://|ftp://"/>
-    </module>
     <module name="AvoidStarImport"/>
     <module name="OneTopLevelClass"/>
     <module name="NoLineWrap"/>
@@ -238,11 +239,8 @@
     <module name="JavadocMethod">
       <property name="scope" value="public"/>
       <property name="allowMissingParamTags" value="true"/>
-      <property name="allowMissingThrowsTags" value="true"/>
       <property name="allowMissingReturnTag" value="true"/>
-      <property name="minLineCount" value="2"/>
       <property name="allowedAnnotations" value="Override, Test"/>
-      <property name="allowThrowsTagsForSubclasses" value="true"/>
     </module>
     <module name="MethodName">
       <property name="format" value="^[a-z][a-z0-9][a-zA-Z0-9_]*$"/>

gradle/checkstyle.gradle

@@ -1,7 +1,7 @@
 checkstyle {
     def configDirectory = new File(project.rootDir, ["config", "checkstyle"].join(File.separator))
 
-    toolVersion '8.14'
+    toolVersion '8.39'
     configFile new File(configDirectory, "checkstyle.xml")
     configProperties = [configDirectory: configDirectory.getAbsolutePath()]
     

proxy/src/main/java/com/velocitypowered/proxy/Metrics.java

@@ -1,7 +1,6 @@
 package com.velocitypowered.proxy;
 
 import com.velocitypowered.proxy.config.VelocityConfiguration;
-
 import java.io.File;
 import java.io.IOException;
 import java.nio.file.Paths;
@@ -9,7 +8,6 @@ import java.util.HashMap;
 import java.util.Map;
 import java.util.regex.Matcher;
 import java.util.regex.Pattern;
-
 import org.apache.logging.log4j.LogManager;
 import org.apache.logging.log4j.Logger;
 import org.bstats.MetricsBase;

proxy/src/main/java/com/velocitypowered/proxy/command/builtin/VelocityCommand.java

@@ -3,7 +3,6 @@ package com.velocitypowered.proxy.command.builtin;
 import com.google.common.base.Joiner;
 import com.google.common.collect.ImmutableList;
 import com.google.common.collect.ImmutableMap;
-
 import com.google.common.collect.ImmutableSet;
 import com.google.common.util.concurrent.MoreExecutors;
 import com.google.gson.JsonArray;
@@ -20,7 +19,6 @@ import com.velocitypowered.api.proxy.server.RegisteredServer;
 import com.velocitypowered.api.util.ProxyVersion;
 import com.velocitypowered.proxy.VelocityServer;
 import com.velocitypowered.proxy.util.InformationUtils;
-
 import java.net.ConnectException;
 import java.net.UnknownHostException;
 import java.nio.charset.StandardCharsets;
@@ -31,7 +29,6 @@ import java.util.Locale;
 import java.util.Map;
 import java.util.concurrent.ExecutionException;
 import java.util.stream.Collectors;
-
 import net.kyori.adventure.identity.Identity;
 import net.kyori.adventure.text.Component;
 import net.kyori.adventure.text.TextComponent;

proxy/src/main/java/com/velocitypowered/proxy/config/VelocityConfiguration.java

@@ -11,12 +11,10 @@ import com.google.gson.annotations.Expose;
 import com.velocitypowered.api.proxy.config.ProxyConfig;
 import com.velocitypowered.api.util.Favicon;
 import com.velocitypowered.proxy.util.AddressUtil;
-
 import edu.umd.cs.findbugs.annotations.SuppressFBWarnings;
 import java.io.File;
 import java.io.IOException;
 import java.io.InputStream;
-import java.net.InetSocketAddress;
 import java.net.SocketAddress;
 import java.net.URL;
 import java.nio.charset.StandardCharsets;

proxy/src/main/java/com/velocitypowered/proxy/connection/registry/DimensionRegistry.java

@@ -3,11 +3,9 @@ package com.velocitypowered.proxy.connection.registry;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableSet;
 import com.google.common.collect.Maps;
-
 import com.velocitypowered.api.network.ProtocolVersion;
 import java.util.Map;
 import java.util.Set;
-
 import net.kyori.adventure.nbt.BinaryTag;
 import net.kyori.adventure.nbt.BinaryTagTypes;
 import net.kyori.adventure.nbt.CompoundBinaryTag;

proxy/src/main/java/com/velocitypowered/proxy/network/ProtocolUtils.java

@@ -15,7 +15,6 @@ import io.netty.buffer.ByteBufUtil;
 import io.netty.handler.codec.CorruptedFrameException;
 import io.netty.handler.codec.DecoderException;
 import io.netty.handler.codec.EncoderException;
-
 import java.io.DataInput;
 import java.io.DataOutput;
 import java.io.IOException;
@@ -23,7 +22,6 @@ import java.nio.charset.StandardCharsets;
 import java.util.ArrayList;
 import java.util.List;
 import java.util.UUID;
-
 import net.kyori.adventure.nbt.BinaryTagIO;
 import net.kyori.adventure.nbt.CompoundBinaryTag;
 import net.kyori.adventure.text.serializer.gson.GsonComponentSerializer;

proxy/src/main/java/com/velocitypowered/proxy/network/packet/AbstractStatusPingPacket.java

@@ -12,6 +12,7 @@ public abstract class AbstractStatusPingPacket implements Packet {
       return factory.apply(randomId);
     };
   }
+
   protected static <P extends AbstractStatusPingPacket> PacketWriter<P> encoder() {
     return (buf, packet, version) -> buf.writeLong(packet.getRandomId());
   }

proxy/src/main/java/com/velocitypowered/proxy/network/packet/serverbound/ServerboundServerLoginPacket.java

@@ -1,14 +1,12 @@
 package com.velocitypowered.proxy.network.packet.serverbound;
 
 import com.google.common.base.MoreObjects;
-import com.velocitypowered.api.network.ProtocolVersion;
 import com.velocitypowered.proxy.network.ProtocolUtils;
 import com.velocitypowered.proxy.network.packet.Packet;
 import com.velocitypowered.proxy.network.packet.PacketHandler;
 import com.velocitypowered.proxy.network.packet.PacketReader;
 import com.velocitypowered.proxy.network.packet.PacketWriter;
 import com.velocitypowered.proxy.util.except.QuietDecoderException;
-import io.netty.buffer.ByteBuf;
 import java.util.Objects;
 
 public class ServerboundServerLoginPacket implements Packet {
@@ -21,6 +19,7 @@ public class ServerboundServerLoginPacket implements Packet {
     }
     return new ServerboundServerLoginPacket(username);
   };
+
   public static final PacketWriter<ServerboundServerLoginPacket> ENCODER = (buf, packet, version) ->
       ProtocolUtils.writeString(buf, packet.username);
 

proxy/src/main/java/com/velocitypowered/proxy/util/InformationUtils.java

@@ -15,7 +15,6 @@ import com.velocitypowered.api.proxy.ProxyServer;
 import com.velocitypowered.api.proxy.config.ProxyConfig;
 import com.velocitypowered.api.proxy.server.RegisteredServer;
 import com.velocitypowered.api.util.ProxyVersion;
-
 import io.netty.channel.unix.DomainSocketAddress;
 import java.net.Inet4Address;
 import java.net.Inet6Address;