Help with Ai And Attributes For Entity [1.8]

hello,

i am making a entity which is going to attack near players.

import net.minecraft.entity.EntityCreature;
import net.minecraft.entity.SharedMonsterAttributes;
import net.minecraft.entity.ai.EntityAIAttackOnCollide;
import net.minecraft.entity.ai.EntityAIPanic;
import net.minecraft.entity.ai.EntityAISwimming;
import net.minecraft.entity.ai.EntityAIWander;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.world.World;

public class EntityLeader extends EntityCreature {


public EntityLeader(World worldIn) {
	super(worldIn);
	tasks.addTask(10, new EntityAIAttackOnCollide(this, EntityPlayer.class, 1D, true));
}



@Override
protected void applyEntityAttributes() {
	super.applyEntityAttributes();
	this.getEntityAttribute(SharedMonsterAttributes.attackDamage).setBaseValue(3.0D);
	 this.getEntityAttribute(SharedMonsterAttributes.maxHealth).setBaseValue(10.0D);
     this.getEntityAttribute(SharedMonsterAttributes.movementSpeed).setBaseValue(0.20000000298023224D);

}


@Override
public boolean isAIDisabled() {
	return false;
}






}

but this seems to not work. if i remove applyentityattribute method then it starts working but then it doesnt attack any player ( i think because it doesnt have any base atk)

and here is my 2nd problem

public class EntityLeaderAI extends EntityAIBase{

private EntityLeader leader;

public EntityLeaderAI(EntityLeader e)
{
	leader=e;
	setMutexBits(7);
}

@Override
public boolean shouldExecute() {
		if(this.leader.getAITarget()!=null && !this.leader.isBurning())
		{
			return true;
		}
		else
		{
		return false;
		}
}


@Override
public void startExecuting() {

	this.leader.attackEntityAsMob(<server type player here>);//how can i get server type player?

}



}

please see the comment in code.

thanks for helping.