Fixed most Checkstyle warnings in the API.

api/src/ap/java/com/velocitypowered/api/plugin/ap/PluginAnnotationProcessor.java

@@ -57,8 +57,8 @@ public class PluginAnnotationProcessor extends AbstractProcessor {
       if (Objects.equals(pluginClassFound, qualifiedName.toString())) {
         if (!warnedAboutMultiplePlugins) {
           environment.getMessager()
-              .printMessage(Diagnostic.Kind.WARNING, "Velocity does not yet currently support " +
+              .printMessage(Diagnostic.Kind.WARNING, "Velocity does not yet currently support "
-                  "multiple plugins. We are using " + pluginClassFound
+                  + "multiple plugins. We are using " + pluginClassFound
                   + " for your plugin's main class.");
           warnedAboutMultiplePlugins = true;
         }
@@ -69,8 +69,8 @@ public class PluginAnnotationProcessor extends AbstractProcessor {
       if (!PluginDescription.ID_PATTERN.matcher(plugin.id()).matches()) {
         environment.getMessager().printMessage(Diagnostic.Kind.ERROR, "Invalid ID for plugin "
             + qualifiedName
-            + ". IDs must start alphabetically, have alphanumeric characters, and can " +
+            + ". IDs must start alphabetically, have alphanumeric characters, and can "
-            "contain dashes or underscores.");
+            + "contain dashes or underscores.");
         return false;
       }
 

api/src/ap/java/com/velocitypowered/api/plugin/ap/SerializedPluginDescription.java

@@ -23,7 +23,7 @@ public class SerializedPluginDescription {
   private final @Nullable List<Dependency> dependencies;
   private final String main;
 
-  public SerializedPluginDescription(String id, String name, String version, String description,
+  private SerializedPluginDescription(String id, String name, String version, String description,
       String url,
       List<String> authors, List<Dependency> dependencies, String main) {
     this.id = Preconditions.checkNotNull(id, "id");
@@ -37,7 +37,7 @@ public class SerializedPluginDescription {
     this.main = Preconditions.checkNotNull(main, "main");
   }
 
-  public static SerializedPluginDescription from(Plugin plugin, String qualifiedName) {
+  static SerializedPluginDescription from(Plugin plugin, String qualifiedName) {
     List<Dependency> dependencies = new ArrayList<>();
     for (com.velocitypowered.api.plugin.Dependency dependency : plugin.dependencies()) {
       dependencies.add(new Dependency(dependency.id(), dependency.optional()));
@@ -89,14 +89,14 @@ public class SerializedPluginDescription {
       return false;
     }
     SerializedPluginDescription that = (SerializedPluginDescription) o;
-    return Objects.equals(id, that.id) &&
+    return Objects.equals(id, that.id)
-        Objects.equals(name, that.name) &&
+        && Objects.equals(name, that.name)
-        Objects.equals(version, that.version) &&
+        && Objects.equals(version, that.version)
-        Objects.equals(description, that.description) &&
+        && Objects.equals(description, that.description)
-        Objects.equals(url, that.url) &&
+        && Objects.equals(url, that.url)
-        Objects.equals(authors, that.authors) &&
+        && Objects.equals(authors, that.authors)
-        Objects.equals(dependencies, that.dependencies) &&
+        && Objects.equals(dependencies, that.dependencies)
-        Objects.equals(main, that.main);
+        && Objects.equals(main, that.main);
   }
 
   @Override
@@ -106,16 +106,16 @@ public class SerializedPluginDescription {
 
   @Override
   public String toString() {
-    return "SerializedPluginDescription{" +
+    return "SerializedPluginDescription{"
-        "id='" + id + '\'' +
+        + "id='" + id + '\''
-        ", name='" + name + '\'' +
+        + ", name='" + name + '\''
-        ", version='" + version + '\'' +
+        + ", version='" + version + '\''
-        ", description='" + description + '\'' +
+        + ", description='" + description + '\''
-        ", url='" + url + '\'' +
+        + ", url='" + url + '\''
-        ", authors=" + authors +
+        + ", authors=" + authors
-        ", dependencies=" + dependencies +
+        + ", dependencies=" + dependencies
-        ", main='" + main + '\'' +
+        + ", main='" + main + '\''
-        '}';
+        + '}';
   }
 
   public static class Dependency {
@@ -145,8 +145,8 @@ public class SerializedPluginDescription {
         return false;
       }
       Dependency that = (Dependency) o;
-      return optional == that.optional &&
+      return optional == that.optional
-          Objects.equals(id, that.id);
+          && Objects.equals(id, that.id);
     }
 
     @Override
@@ -156,10 +156,10 @@ public class SerializedPluginDescription {
 
     @Override
     public String toString() {
-      return "Dependency{" +
+      return "Dependency{"
-          "id='" + id + '\'' +
+          + "id='" + id + '\''
-          ", optional=" + optional +
+          + ", optional=" + optional
-          '}';
+          + '}';
     }
   }
 }

api/src/main/java/com/velocitypowered/api/event/connection/ConnectionHandshakeEvent.java

@@ -20,8 +20,8 @@ public final class ConnectionHandshakeEvent {
 
   @Override
   public String toString() {
-    return "ConnectionHandshakeEvent{" +
+    return "ConnectionHandshakeEvent{"
-        "connection=" + connection +
+        + "connection=" + connection
-        '}';
+        + '}';
   }
 }

api/src/main/java/com/velocitypowered/api/event/connection/DisconnectEvent.java

@@ -21,8 +21,8 @@ public final class DisconnectEvent {
 
   @Override
   public String toString() {
-    return "DisconnectEvent{" +
+    return "DisconnectEvent{"
-        "player=" + player +
+        + "player=" + player
-        '}';
+        + '}';
   }
 }

api/src/main/java/com/velocitypowered/api/event/connection/LoginEvent.java

@@ -34,9 +34,9 @@ public final class LoginEvent implements ResultedEvent<ResultedEvent.ComponentRe
 
   @Override
   public String toString() {
-    return "LoginEvent{" +
+    return "LoginEvent{"
-        "player=" + player +
+        + "player=" + player
-        ", result=" + result +
+        + ", result=" + result
-        '}';
+        + '}';
   }
 }

api/src/main/java/com/velocitypowered/api/event/connection/PluginMessageEvent.java

@@ -4,6 +4,8 @@ import com.google.common.base.Preconditions;
 import com.google.common.io.ByteArrayDataInput;
 import com.google.common.io.ByteStreams;
 import com.velocitypowered.api.event.ResultedEvent;
+import com.velocitypowered.api.proxy.Player;
+import com.velocitypowered.api.proxy.ServerConnection;
 import com.velocitypowered.api.proxy.messages.ChannelIdentifier;
 import com.velocitypowered.api.proxy.messages.ChannelMessageSink;
 import com.velocitypowered.api.proxy.messages.ChannelMessageSource;
@@ -11,7 +13,7 @@ import java.util.Arrays;
 
 /**
  * This event is fired when a plugin message is sent to the proxy, either from a client ({@link
- * com.velocitypowered.api.proxy.Player}) or a server ({@link com.velocitypowered.api.proxy.ServerConnection}).
+ * Player}) or a server ({@link ServerConnection}).
  */
 public final class PluginMessageEvent implements ResultedEvent<PluginMessageEvent.ForwardResult> {
 
@@ -21,6 +23,14 @@ public final class PluginMessageEvent implements ResultedEvent<PluginMessageEven
   private final byte[] data;
   private ForwardResult result;
 
+  /**
+   * Creates a new instance.
+   *
+   * @param source the source of the plugin message
+   * @param target the destination of the plugin message
+   * @param identifier the channel for this plugin message
+   * @param data the payload of the plugin message
+   */
   public PluginMessageEvent(ChannelMessageSource source, ChannelMessageSink target,
       ChannelIdentifier identifier, byte[] data) {
     this.source = Preconditions.checkNotNull(source, "source");
@@ -62,13 +72,13 @@ public final class PluginMessageEvent implements ResultedEvent<PluginMessageEven
 
   @Override
   public String toString() {
-    return "PluginMessageEvent{" +
+    return "PluginMessageEvent{"
-        "source=" + source +
+        + "source=" + source
-        ", target=" + target +
+        + ", target=" + target
-        ", identifier=" + identifier +
+        + ", identifier=" + identifier
-        ", data=" + Arrays.toString(data) +
+        + ", data=" + Arrays.toString(data)
-        ", result=" + result +
+        + ", result=" + result
-        '}';
+        + '}';
   }
 
   /**

api/src/main/java/com/velocitypowered/api/event/connection/PostLoginEvent.java

@@ -4,8 +4,8 @@ import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.Player;
 
 /**
- * This event is fired once the player has been successfully authenticated and fully initialized and
+ * This event is fired once the player has been fully initialized and is about to connect to their
- * player will be connected to server after this event
+ * first server.
  */
 public final class PostLoginEvent {
 

api/src/main/java/com/velocitypowered/api/event/connection/PreLoginEvent.java

@@ -19,6 +19,11 @@ public final class PreLoginEvent implements ResultedEvent<PreLoginEvent.PreLogin
   private final String username;
   private PreLoginComponentResult result;
 
+  /**
+   * Creates a new instance.
+   * @param connection the connection logging into the proxy
+   * @param username the player's username
+   */
   public PreLoginEvent(InboundConnection connection, String username) {
     this.connection = Preconditions.checkNotNull(connection, "connection");
     this.username = Preconditions.checkNotNull(username, "username");
@@ -45,11 +50,11 @@ public final class PreLoginEvent implements ResultedEvent<PreLoginEvent.PreLogin
 
   @Override
   public String toString() {
-    return "PreLoginEvent{" +
+    return "PreLoginEvent{"
-        "connection=" + connection +
+        + "connection=" + connection
-        ", username='" + username + '\'' +
+        + ", username='" + username + '\''
-        ", result=" + result +
+        + ", result=" + result
-        '}';
+        + '}';
   }
 
   /**
@@ -126,7 +131,7 @@ public final class PreLoginEvent implements ResultedEvent<PreLoginEvent.PreLogin
 
     /**
      * Returns a result indicating the connection will be allowed through the proxy, but the
-     * connection will be forced to use offline mode even when proxy running in online mode
+     * connection will be forced to use offline mode even when the proxy is running in online mode.
      *
      * @return the result
      */

api/src/main/java/com/velocitypowered/api/event/permission/PermissionsSetupEvent.java

@@ -54,10 +54,10 @@ public final class PermissionsSetupEvent {
 
   @Override
   public String toString() {
-    return "PermissionsSetupEvent{" +
+    return "PermissionsSetupEvent{"
-        "subject=" + subject +
+        + "subject=" + subject
-        ", defaultProvider=" + defaultProvider +
+        + ", defaultProvider=" + defaultProvider
-        ", provider=" + provider +
+        + ", provider=" + provider
-        '}';
+        + '}';
   }
 }

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

@@ -18,6 +18,12 @@ public final class GameProfileRequestEvent {
   private final boolean onlineMode;
   private @Nullable GameProfile gameProfile;
 
+  /**
+   * Creates a new instance.
+   * @param connection the connection connecting to the proxy
+   * @param originalProfile the original {@link GameProfile} for the user
+   * @param onlineMode whether or not the user connected in online or offline mode
+   */
   public GameProfileRequestEvent(InboundConnection connection, GameProfile originalProfile,
       boolean onlineMode) {
     this.connection = Preconditions.checkNotNull(connection, "connection");
@@ -57,21 +63,19 @@ public final class GameProfileRequestEvent {
    * Sets the game profile to use for this connection. It is invalid to use this method on an
    * online-mode connection.
    *
-   * @param gameProfile the profile to use for the connection, {@code null} uses the original
+   * @param gameProfile the profile for this connection, {@code null} uses the original profile
-   * profile
    */
   public void setGameProfile(@Nullable GameProfile gameProfile) {
-    Preconditions
+    Preconditions.checkState(!onlineMode, "Profiles can not be faked in online mode!");
-        .checkState(!onlineMode, "Connection is in online mode, profiles can not be faked");
     this.gameProfile = gameProfile;
   }
 
   @Override
   public String toString() {
-    return "GameProfileRequestEvent{" +
+    return "GameProfileRequestEvent{"
-        "username=" + username +
+        + "username=" + username
-        ", gameProfile=" + gameProfile +
+        + ", gameProfile=" + gameProfile
-        "}";
+        + "}";
   }
 
 

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

@@ -42,11 +42,11 @@ public final class PlayerChatEvent implements ResultedEvent<PlayerChatEvent.Chat
 
   @Override
   public String toString() {
-    return "PlayerChatEvent{" +
+    return "PlayerChatEvent{"
-        "player=" + player +
+        + "player=" + player
-        ", message=" + message +
+        + ", message=" + message
-        ", result=" + result +
+        + ", result=" + result
-        '}';
+        + '}';
   }
 
   /**

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

@@ -1,5 +1,6 @@
 package com.velocitypowered.api.event.player;
 
+import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.util.ModInfo;
@@ -24,4 +25,12 @@ public final class PlayerModInfoEvent {
   public ModInfo getModInfo() {
     return modInfo;
   }
+
+  @Override
+  public String toString() {
+    return MoreObjects.toStringHelper(this)
+        .add("player", player)
+        .add("modInfo", modInfo)
+        .toString();
+  }
 }

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

@@ -1,5 +1,6 @@
 package com.velocitypowered.api.event.player;
 
+import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
 import com.velocitypowered.api.proxy.Player;
 import com.velocitypowered.api.proxy.player.PlayerSettings;
@@ -21,4 +22,12 @@ public final class PlayerSettingsChangedEvent {
   public PlayerSettings getPlayerSettings() {
     return playerSettings;
   }
+
+  @Override
+  public String toString() {
+    return MoreObjects.toStringHelper(this)
+        .add("player", player)
+        .add("playerSettings", playerSettings)
+        .toString();
+  }
 }

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

@@ -28,9 +28,9 @@ public final class ServerConnectedEvent {
 
   @Override
   public String toString() {
-    return "ServerConnectedEvent{" +
+    return "ServerConnectedEvent{"
-        "player=" + player +
+        + "player=" + player
-        ", server=" + server +
+        + ", server=" + server
-        '}';
+        + '}';
   }
 }

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

@@ -43,11 +43,11 @@ public final class ServerPreConnectEvent implements
 
   @Override
   public String toString() {
-    return "ServerPreConnectEvent{" +
+    return "ServerPreConnectEvent{"
-        "player=" + player +
+        + "player=" + player
-        ", originalServer=" + originalServer +
+        + ", originalServer=" + originalServer
-        ", result=" + result +
+        + ", result=" + result
-        '}';
+        + '}';
   }
 
   /**

api/src/main/java/com/velocitypowered/api/event/proxy/ProxyPingEvent.java

@@ -31,9 +31,9 @@ public final class ProxyPingEvent {
 
   @Override
   public String toString() {
-    return "ProxyPingEvent{" +
+    return "ProxyPingEvent{"
-        "connection=" + connection +
+        + "connection=" + connection
-        ", ping=" + ping +
+        + ", ping=" + ping
-        '}';
+        + '}';
   }
 }

api/src/main/java/com/velocitypowered/api/event/query/ProxyQueryEvent.java

@@ -6,7 +6,7 @@ import java.net.InetAddress;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
 /**
- * This event is fired if proxy is getting queried over GS4 Query protocol
+ * This event is fired if proxy is getting queried over GS4 Query protocol.
  */
 public final class ProxyQueryEvent {
 
@@ -14,6 +14,13 @@ public final class ProxyQueryEvent {
   private final InetAddress querierAddress;
   private QueryResponse response;
 
+  /**
+   * Creates a new event.
+   *
+   * @param queryType the type of query
+   * @param querierAddress the remote address for the query
+   * @param response the current query response
+   */
   public ProxyQueryEvent(QueryType queryType, InetAddress querierAddress, QueryResponse response) {
     this.queryType = Preconditions.checkNotNull(queryType, "queryType");
     this.querierAddress = Preconditions.checkNotNull(querierAddress, "querierAddress");
@@ -21,7 +28,7 @@ public final class ProxyQueryEvent {
   }
 
   /**
-   * Get query type
+   * Returns the kind of query the remote client is performing.
    *
    * @return query type
    */
@@ -31,7 +38,7 @@ public final class ProxyQueryEvent {
   }
 
   /**
-   * Get querier address
+   * Get the address of the client that sent this query.
    *
    * @return querier address
    */
@@ -41,9 +48,9 @@ public final class ProxyQueryEvent {
   }
 
   /**
-   * Get query response
+   * Returns the current query response.
    *
-   * @return query response
+   * @return the current query response
    */
   @NonNull
   public QueryResponse getResponse() {
@@ -51,9 +58,9 @@ public final class ProxyQueryEvent {
   }
 
   /**
-   * Set query response
+   * Sets a new query response.
    *
-   * @param response query response
+   * @param response the new non-null query response
    */
   public void setResponse(@NonNull QueryResponse response) {
     this.response = Preconditions.checkNotNull(response, "response");
@@ -61,20 +68,20 @@ public final class ProxyQueryEvent {
 
   @Override
   public String toString() {
-    return "ProxyQueryEvent{" +
+    return "ProxyQueryEvent{"
-        "queryType=" + queryType +
+        + "queryType=" + queryType
-        ", querierAddress=" + querierAddress +
+        + ", querierAddress=" + querierAddress
-        ", response=" + response +
+        + ", response=" + response
-        '}';
+        + '}';
   }
 
   /**
-   * The type of query
+   * Represents the type of query the client is asking for.
    */
   public enum QueryType {
     /**
      * Basic query asks only a subset of information, such as hostname, game type (hardcoded to
-     * <pre>MINECRAFT</pre>), map, current players, max players, proxy port and proxy hostname
+     * <pre>MINECRAFT</pre>), map, current players, max players, proxy port and proxy hostname.
      */
     BASIC,
 
@@ -82,6 +89,6 @@ public final class ProxyQueryEvent {
      * Full query asks pretty much everything present on this event (only hardcoded values cannot be
      * modified here).
      */
-    FULL;
+    FULL
   }
 }

api/src/main/java/com/velocitypowered/api/permission/Tristate.java

@@ -16,22 +16,22 @@ import org.checkerframework.checker.nullness.qual.Nullable;
 public enum Tristate {
 
   /**
-   * A value indicating a positive setting
+   * A value indicating a positive setting.
    */
   TRUE(true),
 
   /**
-   * A value indicating a negative (negated) setting
+   * A value indicating a negative (negated) setting.
    */
   FALSE(false),
 
   /**
-   * A value indicating a non-existent setting
+   * A value indicating a non-existent setting.
    */
   UNDEFINED(false);
 
   /**
-   * Returns a {@link Tristate} from a boolean
+   * Returns a {@link Tristate} from a boolean.
    *
    * @param val the boolean value
    * @return {@link #TRUE} or {@link #FALSE}, if the value is <code>true</code> or

api/src/main/java/com/velocitypowered/api/plugin/Dependency.java

@@ -5,7 +5,7 @@ import java.lang.annotation.RetentionPolicy;
 import java.lang.annotation.Target;
 
 /**
- * Represents a dependency for a {@link Plugin}
+ * Indicates that the {@link Plugin} depends on another plugin in order to enable.
  */
 @Retention(RetentionPolicy.RUNTIME)
 @Target({})
@@ -20,9 +20,10 @@ public @interface Dependency {
   String id();
 
   /**
-   * If this dependency is optional for the plugin to work. By default this is {@code false}.
+   * Whether or not the dependency is not required to enable this plugin. By default this is
+   * {@code false}, meaning that the dependency is required to enable this plugin.
    *
-   * @return true if the dependency is optional for the plugin to work
+   * @return true if the dependency is not required for the plugin to work
    */
   boolean optional() default false;
 }

api/src/main/java/com/velocitypowered/api/plugin/Plugin.java

@@ -13,9 +13,8 @@ import java.lang.annotation.Target;
 public @interface Plugin {
 
   /**
-   * The ID of the plugin. This ID should be unique as to not conflict with other plugins.
+   * The ID of the plugin. This ID should be unique as to not conflict with other plugins. The
-   *
+   * plugin ID must match the {@link PluginDescription#ID_PATTERN}.
-   * The plugin ID must match the {@link PluginDescription#ID_PATTERN}.
    *
    * @return the ID for this plugin
    */

api/src/main/java/com/velocitypowered/api/plugin/meta/PluginDependency.java

@@ -19,6 +19,12 @@ public final class PluginDependency {
 
   private final boolean optional;
 
+  /**
+   * Creates a new instance.
+   * @param id the plugin ID
+   * @param version an optional version
+   * @param optional whether or not this dependency is optional
+   */
   public PluginDependency(String id, @Nullable String version, boolean optional) {
     this.id = checkNotNull(id, "id");
     checkArgument(!id.isEmpty(), "id cannot be empty");
@@ -27,7 +33,7 @@ public final class PluginDependency {
   }
 
   /**
-   * Returns the plugin ID of this {@link PluginDependency}
+   * Returns the plugin ID of this {@link PluginDependency}.
    *
    * @return the plugin ID
    */
@@ -62,9 +68,9 @@ public final class PluginDependency {
       return false;
     }
     PluginDependency that = (PluginDependency) o;
-    return optional == that.optional &&
+    return optional == that.optional
-        Objects.equals(id, that.id) &&
+        && Objects.equals(id, that.id)
-        Objects.equals(version, that.version);
+        && Objects.equals(version, that.version);
   }
 
   @Override
@@ -74,10 +80,10 @@ public final class PluginDependency {
 
   @Override
   public String toString() {
-    return "PluginDependency{" +
+    return "PluginDependency{"
-        "id='" + id + '\'' +
+        + "id='" + id + '\''
-        ", version='" + version + '\'' +
+        + ", version='" + version + '\''
-        ", optional=" + optional +
+        + ", optional=" + optional
-        '}';
+        + '}';
   }
 }

api/src/main/java/com/velocitypowered/api/proxy/ConnectionRequestBuilder.java

@@ -6,8 +6,8 @@ import java.util.concurrent.CompletableFuture;
 import net.kyori.text.Component;
 
 /**
- * Provides a fluent interface to compose and send a connection request to another server behind the
+ * Provides a fluent interface to send a connection request to another server on the proxy. A
- * proxy. A connection request is created using {@link Player#createConnectionRequest(RegisteredServer)}.
+ * connection request is created using {@link Player#createConnectionRequest(RegisteredServer)}.
  */
 public interface ConnectionRequestBuilder {
 

api/src/main/java/com/velocitypowered/api/proxy/Player.java

@@ -43,7 +43,7 @@ public interface Player extends CommandSource, InboundConnection, ChannelMessage
   Optional<ServerConnection> getCurrentServer();
 
   /**
-   * Returns the player settings
+   * Returns the player's client settings.
    *
    * @return the settings
    */
@@ -57,7 +57,7 @@ public interface Player extends CommandSource, InboundConnection, ChannelMessage
   Optional<ModInfo> getModInfo();
 
   /**
-   * Returns the current player's ping
+   * Returns the current player's ping.
    *
    * @return the player's ping or -1 if ping information is currently unknown
    */

api/src/main/java/com/velocitypowered/api/proxy/config/ProxyConfig.java

@@ -1,5 +1,6 @@
 package com.velocitypowered.api.proxy.config;
 
+import com.velocitypowered.api.proxy.ProxyServer;
 import com.velocitypowered.api.util.Favicon;
 import java.util.List;
 import java.util.Map;
@@ -7,54 +8,54 @@ import java.util.Optional;
 import net.kyori.text.Component;
 
 /**
- * Provides an interface to a proxy configuration
+ * Exposes certain proxy configuration information that plugins may use.
  */
 public interface ProxyConfig {
 
   /**
-   * Whether GameSpy 4 queries are accepted by the proxy
+   * Whether GameSpy 4 queries are accepted by the proxy.
    *
    * @return queries enabled
    */
   boolean isQueryEnabled();
 
   /**
-   * Get the port GameSpy 4 queries are accepted on
+   * Get the port GameSpy 4 queries are accepted on.
    *
    * @return the query port
    */
   int getQueryPort();
 
   /**
-   * Get the map name reported to GameSpy 4 query services
+   * Get the map name reported to GameSpy 4 query services.
    *
    * @return the map name
    */
   String getQueryMap();
 
   /**
-   * Whether GameSpy 4 queries should show plugins installed on Velocity by default
+   * Whether GameSpy 4 queries should show plugins installed on Velocity by default.
    *
    * @return show plugins in query
    */
   boolean shouldQueryShowPlugins();
 
   /**
-   * Get the MOTD component shown in the tab list
+   * Get the MOTD component shown in the tab list.
    *
    * @return the motd component
    */
   Component getMotdComponent();
 
   /**
-   * Get the maximum players shown in the tab list
+   * Get the maximum players shown in the tab list.
    *
    * @return max players
    */
   int getShowMaxPlayers();
 
   /**
-   * Get whether the proxy is online mode. This determines if players are authenticated with Mojang
+   * Get whether the proxy is online mode. This determines if players are authenticated with Mojang.
    * servers.
    *
    * @return online mode enabled
@@ -62,70 +63,72 @@ public interface ProxyConfig {
   boolean isOnlineMode();
 
   /**
-   * Get a Map of all servers registered on this proxy
+   * Get a Map of all servers registered in <code>velocity.toml</code>. This method does
+   * <strong>not</strong> return all the servers currently in memory, although in most cases it
+   * does. For a view of all registered servers, see {@link ProxyServer#getAllServers()}.
    *
    * @return registered servers map
    */
   Map<String, String> getServers();
 
   /**
-   * Get the order of servers that players will be connected to
+   * Get the order of servers that players will be connected to.
    *
    * @return connection order list
    */
   List<String> getAttemptConnectionOrder();
 
   /**
-   * Get forced servers mapped to given virtual host
+   * Get forced servers mapped to a given virtual host.
    *
    * @return list of server names
    */
   Map<String, List<String>> getForcedHosts();
 
   /**
-   * Get the minimum compression threshold for packets
+   * Get the minimum compression threshold for packets.
    *
    * @return the compression threshold
    */
   int getCompressionThreshold();
 
   /**
-   * Get the level of compression that packets will be compressed to
+   * Get the level of compression that packets will be compressed to.
    *
    * @return the compression level
    */
   int getCompressionLevel();
 
   /**
-   * Get the limit for how long a player must wait to log back in
+   * Get the limit for how long a player must wait to log back in.
    *
    * @return the login rate limit (in milliseconds)
    */
   int getLoginRatelimit();
 
   /**
-   * Get the proxy favicon shown in the tablist
+   * Get the proxy favicon shown in the tablist.
    *
    * @return optional favicon
    */
   Optional<Favicon> getFavicon();
 
   /**
-   * Get whether this proxy displays that it supports Forge/FML
+   * Get whether this proxy displays that it supports Forge/FML.
    *
    * @return forge announce enabled
    */
   boolean isAnnounceForge();
 
   /**
-   * Get how long this proxy will wait until performing a read timeout
+   * Get how long this proxy will wait for a connection to be established before timing it out.
    *
    * @return connection timeout (in milliseconds)
    */
   int getConnectTimeout();
 
   /**
-   * Get how long this proxy will wait until performing a read timeout
+   * Get how long this proxy will wait until performing a read timeout.
    *
    * @return read timeout (in milliseconds)
    */

api/src/main/java/com/velocitypowered/api/proxy/messages/ChannelIdentifier.java

@@ -1,7 +1,7 @@
 package com.velocitypowered.api.proxy.messages;
 
 /**
- * Represents a kind of channel identifier.
+ * Represents a kind of channel identifier for use with plugin messaging.
  */
 public interface ChannelIdentifier {
 

api/src/main/java/com/velocitypowered/api/proxy/messages/ChannelRegistrar.java

@@ -7,14 +7,15 @@ package com.velocitypowered.api.proxy.messages;
 public interface ChannelRegistrar {
 
   /**
-   * Registers the specified message identifiers to listen on for the
+   * Registers the specified message identifiers to listen on so you can intercept plugin messages
+   * on the channel using {@link com.velocitypowered.api.event.connection.PluginMessageEvent}.
    *
    * @param identifiers the channel identifiers to register
    */
   void register(ChannelIdentifier... identifiers);
 
   /**
-   * Unregisters the handler for the specified channel.
+   * Removes the intent to listen for the specified channel.
    *
    * @param identifiers the identifiers to unregister
    */

api/src/main/java/com/velocitypowered/api/proxy/messages/MinecraftChannelIdentifier.java

@@ -72,8 +72,8 @@ public final class MinecraftChannelIdentifier implements ChannelIdentifier {
       return false;
     }
     MinecraftChannelIdentifier that = (MinecraftChannelIdentifier) o;
-    return Objects.equals(namespace, that.namespace) &&
+    return Objects.equals(namespace, that.namespace)
-        Objects.equals(name, that.name);
+        && Objects.equals(name, that.name);
   }
 
   @Override

api/src/main/java/com/velocitypowered/api/proxy/player/TabListEntry.java

@@ -45,15 +45,16 @@ public interface TabListEntry {
 
   /**
    * Returns the latency for {@code this} entry.
-   * <p>The icon shown in the tab list is calculated by the latency in the following way:<p>
+   *
+   * <p>The icon shown in the tab list is calculated by the latency as follows:</p>
+   *
    * <ul>
-   * <li>A negative latency will display the no connection icon</li>
+   *  <li>A negative latency will display the no connection icon</li>
-   * <li>0-150 will display 5 bars</li>
+   *  <li>0-150 will display 5 bars</li>
-   * <li>150-300 will display 4 bars</li>
+   *  <li>150-300 will display 4 bars</li>
-   * <li>300-600 will display 3 bars</li>
+   *  <li>300-600 will display 3 bars</li>
-   * <li>600-1000 will display 2 bars</li>
+   *  <li>600-1000 will display 2 bars</li>
-   * <li>A latency move than 1 second will display 1 bar</li>
+   *  <li>A latency move than 1 second will display 1 bar</li>
-   * <li></li>
    * </ul>
    *
    * @return latency set for {@code this} entry
@@ -61,7 +62,7 @@ public interface TabListEntry {
   int getLatency();
 
   /**
-   * Sets the latency for {@code this} entry to the specified value
+   * Sets the latency for {@code this} entry to the specified value.
    *
    * @param latency to changed to
    * @return {@code this}, for chaining
@@ -71,6 +72,7 @@ public interface TabListEntry {
 
   /**
    * Gets the game mode {@code this} entry has been set to.
+   *
    * <p>The number corresponds to the game mode in the following way:</p>
    * <ol start="0">
    * <li>Survival</li>
@@ -142,7 +144,7 @@ public interface TabListEntry {
     }
 
     /**
-     * Sets the displayed name of the {@link TabListEntry}
+     * Sets the displayed name of the {@link TabListEntry}.
      *
      * @param displayName to set
      * @return {@code this}, for chaining
@@ -154,7 +156,7 @@ public interface TabListEntry {
     }
 
     /**
-     * Sets the latency of the {@link TabListEntry}
+     * Sets the latency of the {@link TabListEntry}.
      *
      * @param latency to set
      * @return {@code this}, for chaining
@@ -166,7 +168,7 @@ public interface TabListEntry {
     }
 
     /**
-     * Sets the game mode of the {@link TabListEntry}
+     * Sets the game mode of the {@link TabListEntry}.
      *
      * @param gameMode to set
      * @return {@code this}, for chaining

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

@@ -1,5 +1,6 @@
 package com.velocitypowered.api.proxy.server;
 
+import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
 import com.velocitypowered.api.proxy.config.ProxyConfig;
@@ -7,6 +8,7 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 import java.util.List;
+import java.util.Optional;
 import org.checkerframework.checker.nullness.qual.MonotonicNonNull;
 import org.checkerframework.checker.nullness.qual.Nullable;
 
@@ -90,7 +92,7 @@ public final class QueryResponse {
   }
 
   /**
-   * Get proxy (public facing) hostname
+   * Get proxy (public facing) hostname.
    *
    * @return proxy hostname
    */
@@ -99,7 +101,7 @@ public final class QueryResponse {
   }
 
   /**
-   * Get proxy (public facing) port
+   * Get proxy (public facing) port.
    *
    * @return proxy port
    */
@@ -136,7 +138,7 @@ public final class QueryResponse {
 
 
   /**
-   * Creates a new {@link Builder} instance from data represented by this response
+   * Creates a new {@link Builder} instance from data represented by this response.
    *
    * @return {@link QueryResponse} builder
    */
@@ -155,7 +157,7 @@ public final class QueryResponse {
   }
 
   /**
-   * Creates a new {@link Builder} instance
+   * Creates a new {@link Builder} instance.
    *
    * @return {@link QueryResponse} builder
    */
@@ -225,6 +227,11 @@ public final class QueryResponse {
       return this;
     }
 
+    /**
+     * Sets the port where this proxy is running.
+     * @param proxyPort the port where the proxy is running
+     * @return this instance, for chaining
+     */
     public Builder proxyPort(int proxyPort) {
       Preconditions
           .checkArgument(proxyPort >= 1 && proxyPort <= 65535, "proxyPort must be between 1-65535");
@@ -262,13 +269,19 @@ public final class QueryResponse {
       return this;
     }
 
+    /**
+     * Clears all currently set plugins.
+     *
+     * @return this builder, for chaining
+     */
     public Builder clearPlugins() {
       this.plugins.clear();
       return this;
     }
 
     /**
-     * Builds new {@link QueryResponse} with supplied data
+     * Builds a new {@link QueryResponse} with the supplied data. The current instance can be reused
+     * after this method is called.
      *
      * @return response
      */
@@ -289,37 +302,36 @@ public final class QueryResponse {
   }
 
   /**
-   * Plugin information
+   * Represents a plugin in the query response.
    */
   public static class PluginInformation {
 
-    private String name;
+    private final String name;
-    private String version;
+    private final @Nullable String version;
 
-    public PluginInformation(String name, String version) {
+    PluginInformation(String name, @Nullable String version) {
       this.name = Preconditions.checkNotNull(name, "name");
-      this.version = Preconditions.checkNotNull(version, "version");
+      this.version = version;
     }
 
     public String getName() {
       return name;
     }
 
-    public void setName(String name) {
+    public Optional<String> getVersion() {
-      this.name = name;
+      return Optional.ofNullable(version);
-    }
-
-    public void setVersion(@Nullable String version) {
-      this.version = version;
-    }
-
-    @Nullable
-    public String getVersion() {
-      return version;
     }
 
     public static PluginInformation of(String name, @Nullable String version) {
       return new PluginInformation(name, version);
     }
+
+    @Override
+    public String toString() {
+      return MoreObjects.toStringHelper(this)
+          .add("name", name)
+          .add("version", version)
+          .toString();
+    }
   }
 }

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

@@ -35,10 +35,10 @@ public final class ServerInfo {
 
   @Override
   public String toString() {
-    return "ServerInfo{" +
+    return "ServerInfo{"
-        "name='" + name + '\'' +
+        + "name='" + name + '\''
-        ", address=" + address +
+        + ", address=" + address
-        '}';
+        + '}';
   }
 
   @Override
@@ -50,8 +50,8 @@ public final class ServerInfo {
       return false;
     }
     ServerInfo that = (ServerInfo) o;
-    return Objects.equals(name, that.name) &&
+    return Objects.equals(name, that.name)
-        Objects.equals(address, that.address);
+        && Objects.equals(address, that.address);
   }
 
   @Override

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

@@ -1,5 +1,6 @@
 package com.velocitypowered.api.proxy.server;
 
+import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
 import com.google.common.collect.ImmutableList;
 import com.velocitypowered.api.util.Favicon;
@@ -59,14 +60,18 @@ public final class ServerPing {
 
   @Override
   public String toString() {
-    return "ServerPing{" +
+    return "ServerPing{"
-        "version=" + version +
+        + "version=" + version
-        ", players=" + players +
+        + ", players=" + players
-        ", description=" + description +
+        + ", description=" + description
-        ", favicon='" + favicon + '\'' +
+        + ", favicon='" + favicon + '\''
-        '}';
+        + '}';
   }
 
+  /**
+   * Returns a copy of this {@link ServerPing} instance as a builder so that it can be modified.
+   * @return a copy of this instance as a {@link Builder}
+   */
   public Builder asBuilder() {
     Builder builder = new Builder();
     builder.version = version;
@@ -171,6 +176,11 @@ public final class ServerPing {
       return this;
     }
 
+    /**
+     * Uses the information from this builder to create a new {@link ServerPing} instance. The
+     * builder can be re-used after this event has been called.
+     * @return a new {@link ServerPing} instance
+     */
     public ServerPing build() {
       if (this.version == null) {
         throw new IllegalStateException("version not specified");
@@ -217,18 +227,18 @@ public final class ServerPing {
 
     @Override
     public String toString() {
-      return "Builder{" +
+      return MoreObjects.toStringHelper(this)
-          "version=" + version +
+          .add("version", version)
-          ", onlinePlayers=" + onlinePlayers +
+          .add("onlinePlayers", onlinePlayers)
-          ", maximumPlayers=" + maximumPlayers +
+          .add("maximumPlayers", maximumPlayers)
-          ", samplePlayers=" + samplePlayers +
+          .add("samplePlayers", samplePlayers)
-          ", modType=" + modType +
+          .add("modType", modType)
-          ", mods=" + mods +
+          .add("mods", mods)
-          ", description=" + description +
+          .add("description", description)
-          ", favicon=" + favicon +
+          .add("favicon", favicon)
-          ", nullOutPlayers=" + nullOutPlayers +
+          .add("nullOutPlayers", nullOutPlayers)
-          ", nullOutModinfo=" + nullOutModinfo +
+          .add("nullOutModinfo", nullOutModinfo)
-          '}';
+          .toString();
     }
   }
 
@@ -237,9 +247,14 @@ public final class ServerPing {
     private final int protocol;
     private final String name;
 
+    /**
+     * Creates a new instance.
+     * @param protocol the protocol version as an integer
+     * @param name a friendly name for the protocol version
+     */
     public Version(int protocol, String name) {
       this.protocol = protocol;
-      this.name = name;
+      this.name = Preconditions.checkNotNull(name, "name");
     }
 
     public int getProtocol() {
@@ -252,10 +267,10 @@ public final class ServerPing {
 
     @Override
     public String toString() {
-      return "Version{" +
+      return "Version{"
-          "protocol=" + protocol +
+          + "protocol=" + protocol
-          ", name='" + name + '\'' +
+          + ", name='" + name + '\''
-          '}';
+          + '}';
     }
   }
 
@@ -265,6 +280,12 @@ public final class ServerPing {
     private final int max;
     private final List<SamplePlayer> sample;
 
+    /**
+     * Creates a new instance.
+     * @param online the number of online players
+     * @param max the maximum number of players
+     * @param sample a sample of players on the server
+     */
     public Players(int online, int max, List<SamplePlayer> sample) {
       this.online = online;
       this.max = max;
@@ -285,11 +306,11 @@ public final class ServerPing {
 
     @Override
     public String toString() {
-      return "Players{" +
+      return "Players{"
-          "online=" + online +
+          + "online=" + online
-          ", max=" + max +
+          + ", max=" + max
-          ", sample=" + sample +
+          + ", sample=" + sample
-          '}';
+          + '}';
     }
   }
 
@@ -313,10 +334,10 @@ public final class ServerPing {
 
     @Override
     public String toString() {
-      return "SamplePlayer{" +
+      return "SamplePlayer{"
-          "name='" + name + '\'' +
+          + "name='" + name + '\''
-          ", id=" + id +
+          + ", id=" + id
-          '}';
+          + '}';
     }
   }
 }

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

@@ -59,9 +59,9 @@ public final class Favicon {
 
   @Override
   public String toString() {
-    return "Favicon{" +
+    return "Favicon{"
-        "base64Url='" + base64Url + '\'' +
+        + "base64Url='" + base64Url + '\''
-        '}';
+        + '}';
   }
 
   /**
@@ -72,9 +72,8 @@ public final class Favicon {
    */
   public static Favicon create(BufferedImage image) {
     Preconditions.checkNotNull(image, "image");
-    Preconditions
+    Preconditions.checkArgument(image.getWidth() == 64 && image.getHeight() == 64,
-        .checkArgument(image.getWidth() == 64 && image.getHeight() == 64, "Image does not have" +
+        "Image is not 64x64(found %sx%s)", image.getWidth(), image.getHeight());
-            " 64x64 dimensions (found %sx%s)", image.getWidth(), image.getHeight());
     ByteArrayOutputStream os = new ByteArrayOutputStream();
     try {
       ImageIO.write(image, "PNG", os);

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

@@ -50,11 +50,11 @@ public final class GameProfile {
 
   @Override
   public String toString() {
-    return "GameProfile{" +
+    return "GameProfile{"
-        "id='" + id + '\'' +
+        + "id='" + id + '\''
-        ", name='" + name + '\'' +
+        + ", name='" + name + '\''
-        ", properties=" + properties +
+        + ", properties=" + properties
-        '}';
+        + '}';
   }
 
   public static final class Property {
@@ -83,11 +83,11 @@ public final class GameProfile {
 
     @Override
     public String toString() {
-      return "Property{" +
+      return "Property{"
-          "name='" + name + '\'' +
+          + "name='" + name + '\''
-          ", value='" + value + '\'' +
+          + ", value='" + value + '\''
-          ", signature='" + signature + '\'' +
+          + ", signature='" + signature + '\''
-          '}';
+          + '}';
     }
   }
 }

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

@@ -26,10 +26,10 @@ public final class ModInfo {
 
   @Override
   public String toString() {
-    return "ModInfo{" +
+    return "ModInfo{"
-        "type='" + type + '\'' +
+        + "type='" + type + '\''
-        ", modList=" + modList +
+        + ", modList=" + modList
-        '}';
+        + '}';
   }
 
   public static final class Mod {
@@ -52,10 +52,10 @@ public final class ModInfo {
 
     @Override
     public String toString() {
-      return "Mod{" +
+      return "Mod{"
-          "id='" + id + '\'' +
+          + "id='" + id + '\''
-          ", version='" + version + '\'' +
+          + ", version='" + version + '\''
-          '}';
+          + '}';
     }
   }
 }

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

@@ -13,6 +13,13 @@ public final class ProxyVersion {
   private final String vendor;
   private final String version;
 
+  /**
+   * Creates a new {@link ProxyVersion} instance.
+   *
+   * @param name the name for the proxy implementation
+   * @param vendor the vendor for the proxy implementation
+   * @param version the version for the proxy implementation
+   */
   public ProxyVersion(String name, String vendor, String version) {
     this.name = Preconditions.checkNotNull(name, "name");
     this.vendor = Preconditions.checkNotNull(vendor, "vendor");
@@ -40,9 +47,9 @@ public final class ProxyVersion {
       return false;
     }
     ProxyVersion that = (ProxyVersion) o;
-    return Objects.equals(name, that.name) &&
+    return Objects.equals(name, that.name)
-        Objects.equals(vendor, that.vendor) &&
+        && Objects.equals(vendor, that.vendor)
-        Objects.equals(version, that.version);
+        && Objects.equals(version, that.version);
   }
 
   @Override
@@ -52,10 +59,10 @@ public final class ProxyVersion {
 
   @Override
   public String toString() {
-    return "ProxyVersion{" +
+    return "ProxyVersion{"
-        "name='" + name + '\'' +
+        + "name='" + name + '\''
-        ", vendor='" + vendor + '\'' +
+        + ", vendor='" + vendor + '\''
-        ", version='" + version + '\'' +
+        + ", version='" + version + '\''
-        '}';
+        + '}';
   }
 }

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

@@ -38,8 +38,10 @@ public final class UuidUtils {
    */
   public static String toUndashed(final UUID uuid) {
     Preconditions.checkNotNull(uuid, "uuid");
-    return Strings.padStart(Long.toHexString(uuid.getMostSignificantBits()), 16, '0') +
+    String msbStr = Long.toHexString(uuid.getMostSignificantBits());
-        Strings.padStart(Long.toHexString(uuid.getLeastSignificantBits()), 16, '0');
+    String lsbStr = Long.toHexString(uuid.getLeastSignificantBits());
+    return Strings.padStart(msbStr, 16, '0') + Strings.padStart(lsbStr,
+        16, '0');
   }
 
   /**

api/src/main/java/com/velocitypowered/api/util/title/TextTitle.java

@@ -1,5 +1,6 @@
 package com.velocitypowered.api.util.title;
 
+import com.google.common.base.MoreObjects;
 import com.google.common.base.Preconditions;
 import java.util.Objects;
 import java.util.Optional;
@@ -110,24 +111,24 @@ public final class TextTitle implements Title {
       return false;
     }
     TextTitle textTitle = (TextTitle) o;
-    return stay == textTitle.stay &&
+    return stay == textTitle.stay
-        fadeIn == textTitle.fadeIn &&
+        && fadeIn == textTitle.fadeIn
-        fadeOut == textTitle.fadeOut &&
+        && fadeOut == textTitle.fadeOut
-        resetBeforeSend == textTitle.resetBeforeSend &&
+        && resetBeforeSend == textTitle.resetBeforeSend
-        Objects.equals(title, textTitle.title) &&
+        && Objects.equals(title, textTitle.title)
-        Objects.equals(subtitle, textTitle.subtitle);
+        && Objects.equals(subtitle, textTitle.subtitle);
   }
 
   @Override
   public String toString() {
-    return "TextTitle{" +
+    return MoreObjects.toStringHelper(this)
-        "title=" + title +
+        .add("title", title)
-        ", subtitle=" + subtitle +
+        .add("subtitle", subtitle)
-        ", stay=" + stay +
+        .add("stay", stay)
-        ", fadeIn=" + fadeIn +
+        .add("fadeIn", fadeIn)
-        ", fadeOut=" + fadeOut +
+        .add("fadeOut", fadeOut)
-        ", resetBeforeSend=" + resetBeforeSend +
+        .add("resetBeforeSend", resetBeforeSend)
-        '}';
+        .toString();
   }
 
   @Override
@@ -238,14 +239,14 @@ public final class TextTitle implements Title {
 
     @Override
     public String toString() {
-      return "Builder{" +
+      return MoreObjects.toStringHelper(this)
-          "title=" + title +
+          .add("title", title)
-          ", subtitle=" + subtitle +
+          .add("subtitle", subtitle)
-          ", stay=" + stay +
+          .add("stay", stay)
-          ", fadeIn=" + fadeIn +
+          .add("fadeIn", fadeIn)
-          ", fadeOut=" + fadeOut +
+          .add("fadeOut", fadeOut)
-          ", resetBeforeSend=" + resetBeforeSend +
+          .add("resetBeforeSend", resetBeforeSend)
-          '}';
+          .toString();
     }
   }
 }