Bukkit teleport - nullPointerException

Question

我正在尝试使用以下代码将用户传送到他们自己的领域：

@EventHandler
public static void onPortalTravel(PlayerPortalEvent event) throws Exception {
    if(event.getCause() == PlayerPortalEvent.TeleportCause.END_PORTAL) {
        int x = event.getPlayer().getLocation().getBlockX();
        int y = event.getPlayer().getLocation().getBlockY();
        int z = event.getPlayer().getLocation().getBlockZ();

        String[] data = getPageData("http://example.com/game.php?type=getRealm&location="+x+":"+y+":"+z ).split(":"); // THIS RETURNS <username>:<oldblockid>

        String realm = data[0];
        int oldID = Integer.parseInt(data[1].trim());

        Bukkit.getServer().getWorld("world").getBlockAt(x, y, z).setTypeId(oldID);
 *err*  event.getPlayer().teleport(new Location(Bukkit.getWorld("realms/" + realm), 1, 65, 16.5));
    }

}

，错误是：

Caused by: java.lang.NullPointerException
  at org.bukkit.craftbukkit.v1_6_R2.entity.CraftPlayer.teleport(CraftPlayer.java:395)
  at org.bukkit.craftbukkit.v1_6_R2_entity.CraftEntity.teleport(CraftEntity.java:199)
  at com.mysite.plugin.Start.onPortalTravel(Start.java:202)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
  at java.lang.reflect.Method.invoke(Unknown Source)
  at org.bukkit.plugin.java.JavaPluginLoader$1.execute(JavaPluginLoader.java:425)
     ... 26 more

Answer 1

似乎这个世界尚未加载。你必须先加载它。

此片段会检查世界是否为空。如果为null，则加载（如果世界已存在） 或创造（如果世界还不存在）世界。

@EventHandler
public static void onPortalTravel(PlayerPortalEvent event) throws Exception {
    if (event.getCause() == PlayerPortalEvent.TeleportCause.END_PORTAL) {
        int x = event.getPlayer().getLocation().getBlockX();
        int y = event.getPlayer().getLocation().getBlockY();
        int z = event.getPlayer().getLocation().getBlockZ();

        String[] data = getPageData("http://example.com/game.php?type=getRealm&location="+x+":"+y+":"+z).split(":"); // THIS RETURNS <username>:<oldblockid>
        String realm = data[0];
        int oldID = Integer.parseInt(data[1].trim());

        Bukkit.getServer().getWorld("world").getBlockAt(x, y, z).setTypeId(oldID);
        World world = Bukkit.getWorld("realms/" + realm);
        if(world == null){
            //Loads a world with the name given in the constructor
            WorldCreator wc = new WorldCreator("realms/" + realm);
            world = Bukkit.createWorld(wc);

        }
        event.getPlayer().teleport(new Location(world, 1, 65,16.5));
    }

}