SpaceJumpListener

public class SpaceJumpListener implements Listener {
	SpaceJump plugin;

	public SpaceJumpListener(SpaceJump instance) {
		plugin = instance;
	}

	@EventHandler
	public void onPlayerJoinEvent(PlayerJoinEvent event) {
		Player player = event.getPlayer();
		if (player.hasPermission("spacejump.jump") || player.isOp()) {
			player.addPotionEffect(new PotionEffect(PotionEffectType.JUMP,
					100000, 4));
		}
	}

	@EventHandler
	public void onEntityDamage(EntityDamageEvent event) {
		DamageCause cause = event.getCause();
		if (cause.equals(DamageCause.FALL)) {
			if (event.getEntity() instanceof Player) {
				Player player = (Player) event.getEntity();
				if (player.hasPermission("spacejump.jump")) {
					if (player.hasPotionEffect(PotionEffectType.JUMP)) {
						event.setCancelled(true);
					}
				}
			} else {
				return;
			}
		}
		if(cause.equals(DamageCause.PROJECTILE))
		{
			if(event.getEntity() instanceof Player)
			{

				event.setDamage(20);
			}
		}
	}

	@EventHandler
	public void onSpawn(PlayerRespawnEvent event) {
		final Player player = event.getPlayer();
		plugin.getServer().getScheduler()
				.scheduleSyncDelayedTask(plugin, new Runnable() {
					public void run() {
						if (player.hasPermission("spacejump.jump")
								|| player.isOp()) {
							player.addPotionEffect(new PotionEffect(
									PotionEffectType.JUMP, 100000, 4));
						}
					}
				}, 20); // ******** The 20. is the delay for the task in TICKS
						// ********
	}

}