Fixed ENTITY_DAMAGE involving slimes (per DHowet)

src/main/java/net/minecraft/server/EntityHuman.java

@@ -357,6 +357,22 @@ public abstract class EntityHuman extends EntityLiving {
                 }
             }
 
+            // CraftBukkit start - this is here instead of EntityMonster because EntityLiving(s) that aren't monsters
+            // also damage the player in this way. For example, EntitySlime.
+            if (entity instanceof EntityLiving) {
+                CraftServer server = ((WorldServer) this.world).getServer();
+                org.bukkit.entity.Entity damager = entity.getBukkitEntity();
+                org.bukkit.entity.Entity damagee = this.getBukkitEntity();
+                DamageCause damageType = EntityDamageEvent.DamageCause.ENTITY_ATTACK;
+                EntityDamageByEntityEvent event = new EntityDamageByEntityEvent(damager, damagee, damageType, i);
+                server.getPluginManager().callEvent(event);
+
+                if (event.isCancelled()) {
+                    return false;
+                }
+            }
+            // CraftBukkit end
+
             return i == 0 ? false : super.a(entity, i);
         }
     }

src/main/java/net/minecraft/server/EntityMonster.java

@@ -79,8 +79,10 @@ public class EntityMonster extends EntityCreature implements IMonster {
     protected void a(Entity entity, float f) {
         if ((double) f < 1.5D && entity.boundingBox.e > this.boundingBox.b && entity.boundingBox.b < this.boundingBox.e) {
             this.attackTicks = 20;
-            // CraftBukkit start
-            if (entity instanceof EntityLiving) {
+            // CraftBukkit start - this is still duplicated here and EntityHuman because it's possible for an EntityMonster
+            // to damage another EntityMonster, and we want to catch those events.
+            // This does not fire events for slime attacks, as they're not an EntityMonster.
+            if (entity instanceof EntityLiving && !(entity instanceof EntityHuman)) {
                 CraftServer server = ((WorldServer) this.world).getServer();
                 org.bukkit.entity.Entity damager = this.getBukkitEntity();
                 org.bukkit.entity.Entity damagee = (entity == null) ? null : entity.getBukkitEntity();