TNT now gives its entity to the damage handler

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

@@ -75,7 +75,8 @@ public class EntityTNTPrimed extends Entity {
         server.getPluginManager().callEvent(event);
 
         if (!event.isCancelled()) {
-            this.world.a((Entity) null, this.locX, this.locY, this.locZ, event.getRadius(), event.getFire());
+            // give 'this' instead of (Entity) null so we know what causes the damage
+            this.world.a(this, this.locX, this.locY, this.locZ, event.getRadius(), event.getFire());
         }
         // CraftBukkit end
     }