Bukkit

package com.aim.coltonjgriswold.projectiles;

import org.bukkit.Location;
import org.bukkit.block.Block;
import org.bukkit.entity.Damageable;
import org.bukkit.entity.Entity;
import org.bukkit.entity.Player;

import com.aim.coltonjgriswold.api.ParticleProjectile;

public class MyProjectile extends ParticleProjectile {

    public MyProjectile() {
	super(Particle.REDSTONE, 0.1, 7.5, 20.0, 128.0);<br />        ignoreMaterial(Material.STATIONARY_WATER);<br />        setColor(ParticleColor.fromRGB(255, 0, 0);
	//Initialize a projectile with a color of red, a hitbox of 0.1 cubed, Mass of 7.5 grams, speed of 20.0 meters/second, max distance of 128 meters, and ignore STATIONARY_WATER.
    }

    @Override
    public void OnHit(LivingEntity who, Location start, Location end) {
	//Do something when reach max distance
    }

    @Override
    public void OnHitBlock(LivingEntity who, Location start, Location end, Block what) {
	//Do something when hit block
    }

    @Override
    public void OnHitEntity(LivingEntity who, Location start, Location end, Entity what) {
	//Do something when hit entity
    }

    @Override
    public void OnPenetrateBlock(LivingEntity  who, Location where, Block what) {
	//Do something when passing through a block
    }

    @Override
    public void OnPenetrateEntity(LivingEntity  who, Location where, Entity what) {
	//Do something when passing through an entity
    }

}

package com.aim.coltonjgriswold;

import org.bukkit.Material;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;
import org.bukkit.event.player.PlayerInteractEvent;
import org.bukkit.plugin.java.JavaPlugin;
import org.bukkit.util.Vector;

import com.aim.coltonjgriswold.api.utilities.ParticleColor;
import com.aim.coltonjgriswold.projectiles.MyProjectile;

public class MyPlugin extends JavaPlugin implements Listener {

    MyProjectile projectile;
    
    public void onEnable() {
	getServer().getPluginManager().registerEvents(this, this);
	projectile = new MyProjectile();
    }

    public void onDisable() {

    }
    
    @EventHandler
    public void oninteract(PlayerInteractEvent event) {
	Material item = event.getPlayer().getInventory().getItemInMainHand().getType();
	if (item == Material.STICK) {
	    //launch MyProjectile with physics turned on
	    projectile.launch(event.getPlayer(), true);
	}
    }
}