[1.8] Entity doesn't attack player

Hi there, here is my entity class

package com.practise.NPC;

import com.practise.ai.AttackerAi;

import net.minecraft.entity.ai.EntityAIAttackOnCollide;
import net.minecraft.entity.passive.EntityWolf;
import net.minecraft.entity.player.EntityPlayer;
import net.minecraft.world.World;

public class Attacker extends EntityWolf{



public Attacker(World worldIn) {
	super(worldIn);
	this.tasks.addTask(1, new EntityAIAttackOnCollide(this, EntityPlayer.class, 1.2D, false));
}	
}

I use the spawn egg create the entity, but the EntityAIAttackOnCollide doesn't work, the entity doesn't attack player.