我一直在制作一個(gè) bukkit 插件，它顯示在插件列表中，但是當(dāng)我做我想讓代碼做的事情時(shí)，什么也沒發(fā)生。public class MyClass extends JavaPlugin implements Listener {@EventHandlerpublic void onInteract(PlayerInteractEvent event) {  Player player = event.getPlayer();  if (player.isSneaking()) {      player.sendMessage("Fire!");      Arrow arrow = player.launchProjectile(Arrow.class);      arrow.setShooter(player);      arrow.setGravity(false);      arrow.setSilent(true);      arrow.setBounce(false);      Block attach = arrow.getAttachedBlock();      Location attachlocation = attach.getLocation();      attachlocation.getWorld().createExplosion(attachlocation, 3);            arrow.setVelocity((player.getEyeLocation().getDirection().multiply(1000)));      }   }}