How can i shoot custom projectile like shoot arrow procedure ?

I need to shoot a custom projectile like shoot arrow procedure but failed . I making mod a that gonna have a barrage punch when right click with an item , and there is no shoot custom projectile . I tried to edit the arrow to the custom projectile , this is the original code :

package net.ger.kauzilax.procedure;

import net.minecraft.world.World;
import net.minecraft.entity.projectile.EntityTippedArrow;
import net.minecraft.entity.EntityLivingBase;
import net.minecraft.entity.Entity;

import net.ger.kauzilax.ElementsKuajix;

@ElementsKuajix.ModElement.Tag
public class ProcedureBarrage extends ElementsKuajix.ModElement {
    public ProcedureBarrage(ElementsKuajix instance) {
        super(instance, 24);
    }

    public static void executeProcedure(java.util.HashMap<String, Object> dependencies) {
        if (dependencies.get("entity") == null) {
            System.err.println("Failed to load dependency entity for procedure Barrage!");
            return;
        }
        if (dependencies.get("world") == null) {
            System.err.println("Failed to load dependency world for procedure Barrage!");
            return;
        }
        Entity entity = (Entity) dependencies.get("entity");
        World world = (World) dependencies.get("world");
        if (!world.isRemote && entity instanceof EntityLivingBase) {
            EntityTippedArrow entityToSpawn = new EntityTippedArrow(world, (EntityLivingBase) entity);
            entityToSpawn.shoot(entity.getLookVec().x, entity.getLookVec().y, entity.getLookVec().z, ((float) 1) * 2.0F, 0);
            entityToSpawn.setDamage(((float) 5) * 2.0F);
            entityToSpawn.setKnockbackStrength((int) 5);
            world.spawnEntity(entityToSpawn);
        }
    }
}

  But i when edited it , it always showed an error . How can i edit the arrow to the custom projectile i want. Can you help me with this . Thanks