Modified mcMMO's onEntityDamage to have better compatibility.

Changelog.txt

@@ -2,7 +2,7 @@ Changelog:
 #Versions without changelogs probably had very small misc fixes, like tweaks to the source code
 
 Version 1.2.12
- - Changed priority of onEntityDamage to come dead last to respect other plugins event cancelling
+ - Modified onEntityDamage to have better compatibility with other plugins
  - Fixed /mcgod, & /mmoedit defaulting to true
  - Fixed Fishing not handing out any XP
  

src/main/java/com/gmail/nossr50/listeners/mcEntityListener.java

@@ -33,6 +33,7 @@ import org.bukkit.inventory.ItemStack;
 
 import com.gmail.nossr50.Combat;
 import com.gmail.nossr50.Users;
+import com.gmail.nossr50.m;
 import com.gmail.nossr50.mcMMO;
 import com.gmail.nossr50.config.LoadProperties;
 import com.gmail.nossr50.datatypes.PlayerProfile;
@@ -52,9 +53,13 @@ public class mcEntityListener implements Listener
         this.plugin = plugin;
     }
 
-    @EventHandler(priority = EventPriority.MONITOR)
+    @EventHandler(priority = EventPriority.LOW)
     public void onEntityDamage(EntityDamageEvent event) 
     {
+        //Pass around a fake event to see if any plugins cancel it
+        if(!m.EntityDamageEventSimulate(event.getEntity(), event.getCause(), event.getDamage()))
+            return;
+        
     	if(event.isCancelled())
     		return;
     	

src/main/java/com/gmail/nossr50/m.java

@@ -26,8 +26,10 @@ import org.bukkit.Location;
 import org.bukkit.Material;
 import org.bukkit.block.Block;
 import org.bukkit.entity.*;
+import org.bukkit.event.entity.EntityDamageEvent.DamageCause;
 import org.bukkit.inventory.ItemStack;
 import com.gmail.nossr50.config.*;
+import com.gmail.nossr50.datatypes.FakeEntityDamageEvent;
 import com.gmail.nossr50.datatypes.PlayerProfile;
 import com.gmail.nossr50.datatypes.FakeBlockBreakEvent;
 import com.gmail.nossr50.datatypes.SkillType;
@@ -145,6 +147,19 @@ public class m
 		}
 	}
 	
+	public static boolean EntityDamageEventSimulate(Entity damagee, DamageCause cause, int damage)
+	{
+	    FakeEntityDamageEvent event = new FakeEntityDamageEvent(damagee, cause, damage);
+	    
+	    Bukkit.getServer().getPluginManager().callEvent(event);
+	    if(!event.isCancelled())
+        {
+            return true; //Return true if not cancelled
+        } else {
+            return false; //Return false if cancelled
+        }
+	}
+
 	public static void damageTool(Player player, short damage)
 	{
 		if(player.getItemInHand().getTypeId() == 0)