Bukkit传送-nullPointerException [英] Bukkit teleport - nullPointerException

问题描述

我正在尝试使用以下代码将用户传送到自己的境界：

I am trying to teleport a user to their own realm using the following code:

@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));
    }

}

，错误为：

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

推荐答案

似乎这个世界还没有加载。您必须先加载它。

It seems like this world is not loaded yet. You have to load it first.

此摘要检查世界是否为空。如果为null，则会加载（如果世界已经存在）
或创建（如果世界尚不存在）世界。

This snippets checks if the world is null. If it is null, it loads(if the world already exists) or creates(if the world doesn't exist yet) the world.

@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));
    }

}

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