April 4, 20178 yr You will need to add an entity AI to attack the current target, and one to target the nearest hostile mob. Have a look at EntityWolf#initEntityAI for a good example of how that works. As far as I can see, though, vanilla doesn't have an entity AI for targetting the nearest hostile mob, so you will need to create it yourself. EntityAINearestAttackableTarget is close, but only accepts one type of targetable Entity. You can tell if a given type of Entity is hostile because it will implement the IMob interface.
April 4, 20178 yr You might also find ideas in the iron and snow golems. The debugger is a powerful and necessary tool in any IDE, so learn how to use it. You'll be able to tell us more and get better help here if you investigate your runtime problems in the debugger before posting.
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