Use final fields where needed.

src/main/java/com/onarandombox/MultiverseCore/MultiverseCore.java

@@ -128,9 +128,9 @@ public class MultiverseCore extends JavaPlugin implements MVPlugin, Core {
     private static final int PROTOCOL = 24;
     // TODO: Investigate if this one is really needed to be static.
     // Doubt it. -- FernFerret
-    private static Map<String, String> teleportQueue = new HashMap<String, String>();
+    private static final Map<String, String> teleportQueue = new HashMap<String, String>();
 
-    private AnchorManager anchorManager = new AnchorManager(this);
+    private final AnchorManager anchorManager = new AnchorManager(this);
     // TODO please let's make this non-static
     private volatile MultiverseCoreConfiguration config;
 

src/main/java/com/onarandombox/MultiverseCore/commands/CloneCommand.java

@@ -20,7 +20,7 @@ import com.onarandombox.MultiverseCore.api.MVWorldManager;
  * Creates a clone of a world.
  */
 public class CloneCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public CloneCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/ConfigCommand.java

@@ -19,6 +19,7 @@ import java.util.Map;
  * Allows you to set Global MV Variables.
  */
 public class ConfigCommand extends MultiverseCommand {
+
     public ConfigCommand(MultiverseCore plugin) {
         super(plugin);
         this.setName("Configuration");

src/main/java/com/onarandombox/MultiverseCore/commands/CoordCommand.java

@@ -24,7 +24,7 @@ import java.util.List;
  * Returns detailed information on the Players where abouts.
  */
 public class CoordCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public CoordCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/CreateCommand.java

@@ -26,7 +26,7 @@ import java.util.List;
  * Creates a new world and loads it.
  */
 public class CreateCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public CreateCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/InfoCommand.java

@@ -30,7 +30,7 @@ import java.util.List;
  * Returns detailed information about a world.
  */
 public class InfoCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public InfoCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/ModifyAddCommand.java

@@ -25,7 +25,7 @@ import java.util.List;
  * Used to modify various aspects of worlds.
  */
 public class ModifyAddCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public ModifyAddCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/ModifyClearCommand.java

@@ -22,7 +22,7 @@ import java.util.List;
  * Removes all values from a world-property.
  */
 public class ModifyClearCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public ModifyClearCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/ModifyRemoveCommand.java

@@ -22,7 +22,7 @@ import java.util.List;
  * Removes values from a world-property.
  */
 public class ModifyRemoveCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public ModifyRemoveCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/ModifySetCommand.java

@@ -23,7 +23,7 @@ import java.util.List;
  * Used to set world-properties.
  */
 public class ModifySetCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public ModifySetCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/PurgeCommand.java

@@ -24,7 +24,7 @@ import java.util.List;
  * Removes a type of mob from a world.
  */
 public class PurgeCommand extends MultiverseCommand {
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public PurgeCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/TeleportCommand.java

@@ -34,7 +34,7 @@ import java.util.logging.Level;
  * Used to teleport players.
  */
 public class TeleportCommand extends MultiverseCommand {
-    private SafeTTeleporter playerTeleporter;
+    private final SafeTTeleporter playerTeleporter;
 
     public TeleportCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/commands/WhoCommand.java

@@ -23,8 +23,7 @@ import java.util.List;
  * States who is in what world.
  */
 public class WhoCommand extends MultiverseCommand {
-
-    private MVWorldManager worldManager;
+    private final MVWorldManager worldManager;
 
     public WhoCommand(MultiverseCore plugin) {
         super(plugin);

src/main/java/com/onarandombox/MultiverseCore/event/MVConfigReloadEvent.java

@@ -16,7 +16,7 @@ import java.util.List;
  * Called when the Multiverse-config should be reloaded.
  */
 public class MVConfigReloadEvent extends Event {
-    private List<String> configsLoaded;
+    private final List<String> configsLoaded;
 
     public MVConfigReloadEvent(List<String> configsLoaded) {
         this.configsLoaded = configsLoaded;

src/main/java/com/onarandombox/MultiverseCore/event/MVPlayerTouchedPortalEvent.java

@@ -17,8 +17,8 @@ import org.bukkit.event.HandlerList;
  * This event is thrown when a portal is touched.
  */
 public class MVPlayerTouchedPortalEvent extends Event implements Cancellable {
-    private Player p;
-    private Location l;
+    private final Player p;
+    private final Location l;
     private boolean isCancelled;
     private boolean canUse = true;
 

src/main/java/com/onarandombox/MultiverseCore/event/MVRespawnEvent.java

@@ -16,10 +16,9 @@ import org.bukkit.event.HandlerList;
  * Called when a player is respawning.
  */
 public class MVRespawnEvent extends Event {
-    private Player player;
+    private final Player player;
+    private final String respawnMethod;
     private Location location;
-    private String respawnMethod;
-
 
     public MVRespawnEvent(Location spawningAt, Player p, String respawnMethod) {
         this.player = p;

src/main/java/com/onarandombox/MultiverseCore/event/MVTeleportEvent.java

@@ -21,10 +21,10 @@ import org.bukkit.event.HandlerList;
  * Event that gets called when a player use the /mvtp command.
  */
 public class MVTeleportEvent extends Event implements Cancellable {
-    private Player teleportee;
-    private CommandSender teleporter;
-    private MVDestination dest;
-    private boolean useSafeTeleport;
+    private final Player teleportee;
+    private final CommandSender teleporter;
+    private final MVDestination dest;
+    private final boolean useSafeTeleport;
     private boolean isCancelled;
 
     public MVTeleportEvent(MVDestination dest, Player teleportee, CommandSender teleporter, boolean safeTeleport) {

src/main/java/com/onarandombox/MultiverseCore/event/MVWorldPropertyChangeEvent.java

@@ -24,11 +24,11 @@ import org.bukkit.event.HandlerList;
  * @param <T> The type of the property that was set.
  */
 public class MVWorldPropertyChangeEvent<T> extends Event implements Cancellable {
-    private MultiverseWorld world;
-    private CommandSender changer;
-    private boolean isCancelled = false;
-    private String name;
+    private final MultiverseWorld world;
+    private final CommandSender changer;
+    private final String name;
     private T value;
+    private boolean isCancelled = false;
 
     public MVWorldPropertyChangeEvent(MultiverseWorld world, CommandSender changer, String name, T value) {
         this.world = world;

src/main/java/com/onarandombox/MultiverseCore/listeners/MVEntityListener.java

@@ -28,8 +28,8 @@ import java.util.logging.Level;
  * Multiverse's Entity {@link Listener}.
  */
 public class MVEntityListener implements Listener {
-    private MultiverseCore plugin;
-    private MVWorldManager worldManager;
+    private final MultiverseCore plugin;
+    private final MVWorldManager worldManager;
 
     public MVEntityListener(MultiverseCore plugin) {
         this.plugin = plugin;

src/main/java/com/onarandombox/MultiverseCore/listeners/MVPortalListener.java

@@ -26,7 +26,7 @@ import java.util.logging.Level;
  */
 public class MVPortalListener implements Listener {
 
-    private MultiverseCore plugin;
+    private final MultiverseCore plugin;
 
     public MVPortalListener(MultiverseCore core) {
         this.plugin = core;

src/main/java/com/onarandombox/MultiverseCore/listeners/MVWeatherListener.java

@@ -18,7 +18,7 @@ import org.bukkit.event.weather.WeatherChangeEvent;
  * Multiverse's Weather {@link Listener}.
  */
 public class MVWeatherListener implements Listener {
-    private MultiverseCore plugin;
+    private final MultiverseCore plugin;
 
     public MVWeatherListener(MultiverseCore plugin) {
         this.plugin = plugin;

src/main/java/com/onarandombox/MultiverseCore/listeners/MVWorldInitListener.java

@@ -14,7 +14,7 @@ import org.bukkit.event.world.WorldInitEvent;
 
 public class MVWorldInitListener implements Listener {
 
-    MultiverseCore plugin;
+    private final MultiverseCore plugin;
 
     public MVWorldInitListener(MultiverseCore plugin) {
         this.plugin = plugin;

src/main/java/com/onarandombox/MultiverseCore/listeners/MVWorldListener.java

@@ -20,8 +20,8 @@ import org.bukkit.event.world.WorldUnloadEvent;
  * Multiverse's World {@link Listener}.
  */
 public class MVWorldListener implements Listener {
-    private MultiverseCore plugin;
-    private MVWorldManager worldManager;
+    private final MultiverseCore plugin;
+    private final MVWorldManager worldManager;
 
     public MVWorldListener(MultiverseCore plugin) {
         this.plugin = plugin;