--- /home/matt/mc-dev-private//net/minecraft/server/EntitySpider.java	2015-02-26 22:40:22.699608138 +0000
+++ src/main/java/net/minecraft/server/EntitySpider.java	2015-02-26 22:40:22.699608138 +0000
@@ -112,7 +112,7 @@
 
             entityskeleton.setPositionRotation(this.locX, this.locY, this.locZ, this.yaw, 0.0F);
             entityskeleton.prepare(difficultydamagescaler, (GroupDataEntity) null);
-            this.world.addEntity(entityskeleton);
+            this.world.addEntity(entityskeleton, org.bukkit.event.entity.CreatureSpawnEvent.SpawnReason.JOCKEY); // CraftBukkit - add SpawnReason
             entityskeleton.mount(this);
         }