HandlerList should be present in every Events. (It's static you know)

src/main/java/com/gmail/nossr50/events/experience/McMMOPlayerExperienceEvent.java

@@ -2,7 +2,6 @@ package com.gmail.nossr50.events.experience;
 
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;
-import org.bukkit.event.HandlerList;
 import org.bukkit.event.player.PlayerEvent;
 
 import com.gmail.nossr50.datatypes.skills.SkillType;
@@ -64,16 +63,4 @@ public abstract class McMMOPlayerExperienceEvent extends PlayerEvent implements
     public void setCancelled(boolean cancelled) {
         this.cancelled = cancelled;
     }
-
-    /** Rest of file is required boilerplate for custom events **/
-    private static final HandlerList handlers = new HandlerList();
-
-    @Override
-    public HandlerList getHandlers() {
-        return handlers;
-    }
-
-    public static HandlerList getHandlerList() {
-        return handlers;
-    }
 }

src/main/java/com/gmail/nossr50/events/experience/McMMOPlayerLevelDownEvent.java

@@ -1,6 +1,7 @@
 package com.gmail.nossr50.events.experience;
 
 import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
 
 import com.gmail.nossr50.datatypes.skills.SkillType;
 import com.gmail.nossr50.datatypes.skills.XPGainReason;
@@ -46,4 +47,15 @@ public class McMMOPlayerLevelDownEvent extends McMMOPlayerLevelChangeEvent {
     public int getLevelsLost() {
         return levelsLost;
     }
+
+    private static final HandlerList handlers = new HandlerList();
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

src/main/java/com/gmail/nossr50/events/experience/McMMOPlayerLevelUpEvent.java

@@ -1,6 +1,7 @@
 package com.gmail.nossr50.events.experience;
 
 import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
 
 import com.gmail.nossr50.datatypes.skills.SkillType;
 import com.gmail.nossr50.datatypes.skills.XPGainReason;
@@ -46,4 +47,15 @@ public class McMMOPlayerLevelUpEvent extends McMMOPlayerLevelChangeEvent {
     public int getLevelsGained() {
         return levelsGained;
     }
+
+    private static final HandlerList handlers = new HandlerList();
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }

src/main/java/com/gmail/nossr50/events/experience/McMMOPlayerXpGainEvent.java

@@ -1,6 +1,7 @@
 package com.gmail.nossr50.events.experience;
 
 import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
 
 import com.gmail.nossr50.datatypes.skills.SkillType;
 import com.gmail.nossr50.datatypes.skills.XPGainReason;
@@ -51,4 +52,15 @@ public class McMMOPlayerXpGainEvent extends McMMOPlayerExperienceEvent {
     public void setXpGained(int xpGained) {
         this.xpGained = xpGained;
     }
+
+    private static final HandlerList handlers = new HandlerList();
+
+    @Override
+    public HandlerList getHandlers() {
+        return handlers;
+    }
+
+    public static HandlerList getHandlerList() {
+        return handlers;
+    }
 }