Get everything compiling and Checkstyle clean

api/src/main/java/com/velocitypowered/api/util/AdventureCompat.java

@@ -12,6 +12,12 @@ public class AdventureCompat {
     throw new AssertionError("Do not create instances of this class.");
   }
 
+  /**
+   * Converts an {@link net.kyori.text.Component} component into an adventure
+   * {@link net.kyori.adventure.text.Component} component.
+   * @param component the component to translate
+   * @return the translated component
+   */
   public static net.kyori.adventure.text.Component asAdventureComponent(
       net.kyori.text.Component component) {
     String json = net.kyori.text.serializer.gson.GsonComponentSerializer.INSTANCE
@@ -20,6 +26,12 @@ public class AdventureCompat {
         .deserialize(json);
   }
 
+  /**
+   * Converts an {@link net.kyori.adventure.text.Component} component into an text
+   * {@link net.kyori.text.Component} component.
+   * @param component the component to translate
+   * @return the translated component
+   */
   public static net.kyori.text.Component asOriginalTextComponent(
       net.kyori.adventure.text.Component component) {
     String json = net.kyori.adventure.text.serializer.gson.GsonComponentSerializer

proxy/src/main/java/com/velocitypowered/proxy/command/ShutdownCommand.java

@@ -3,7 +3,7 @@ package com.velocitypowered.proxy.command;
 import com.velocitypowered.api.command.Command;
 import com.velocitypowered.api.command.CommandSource;
 import com.velocitypowered.proxy.VelocityServer;
-import net.kyori.text.serializer.legacy.LegacyComponentSerializer;
+import net.kyori.adventure.text.serializer.legacy.LegacyComponentSerializer;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
 public class ShutdownCommand implements Command {
@@ -20,7 +20,7 @@ public class ShutdownCommand implements Command {
       server.shutdown(true);
     } else {
       String reason = String.join(" ", args);
-      server.shutdown(true, LegacyComponentSerializer.legacy().deserialize(reason, '&'));
+      server.shutdown(true, LegacyComponentSerializer.legacy('&').deserialize(reason));
     }
   }
 

proxy/src/main/java/com/velocitypowered/proxy/connection/client/ConnectedPlayer.java

@@ -281,7 +281,8 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
 
   @Override
   public void showTitle(net.kyori.adventure.title.@NonNull Title title) {
-    GsonComponentSerializer serializer = ProtocolUtils.getJsonChatSerializer(this.getProtocolVersion());
+    GsonComponentSerializer serializer = ProtocolUtils.getJsonChatSerializer(this
+        .getProtocolVersion());
 
     TitlePacket titlePkt = new TitlePacket();
     titlePkt.setAction(TitlePacket.SET_TITLE);