Question

我正在用Java为我正在工作的mod公司制作房屋插件（Bukkit 1.6.4）。我需要使用NPCS。我尝试使用Cizizens API，但是当我尝试创建它时，始终会给我一个错误：

java.lang.NullPointerException
        at com.packagenamehere.npc.HouseShopNPC.<init>(HouseShopNPC.java:23)
        at com.packagenamehere.houses.House.createNPCS(House.java:88)
        at com.packagenamehere.data.HouseDataLoader.loadData(HouseDataLoader.java:80)
        at com.packagenamehere.data.HouseDataLoader.<init>(HouseDataLoader.java:20)
        at com.packagenamehere.data.DataSetUp.checkFirstRun(DataSetUp.java:24)
        at com.packagenamehere.data.DataSetUp.<init>(DataSetUp.java:16)
        at com.packagenamehere.main.Main.onEnable(Main.java:205)
        at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:217)
        at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:457)
        at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
        at org.bukkit.craftbukkit.v1_6_R3.CraftServer.loadPlugin(CraftServer.java:284)
        at org.bukkit.craftbukkit.v1_6_R3.CraftServer.enablePlugins(CraftServer.java:266)
        at net.minecraft.server.v1_6_R3.MinecraftServer.l(MinecraftServer.java:315)
        at net.minecraft.server.v1_6_R3.MinecraftServer.f(MinecraftServer.java:292)
        at net.minecraft.server.v1_6_R3.MinecraftServer.a(MinecraftServer.java:252)
        at net.minecraft.server.v1_6_R3.DedicatedServer.init(DedicatedServer.java:152)
        at net.minecraft.server.v1_6_R3.MinecraftServer.run(MinecraftServer.java:393)
        at net.minecraft.server.v1_6_R3.ThreadServerApplication.run(SourceFile:583)

Plugins.yml：

depend: [Multiverse-Core]
name: Housing
description: This is a plugin for housing.
version: 1.0
main: com.packagenamehere.main.Main
Authors: MaxR

commands:
  h:
    usage: /<command>
    description: type /house help for a list of cmds

HouseShopNPC：

package com.packagenamehere.npc;

import net.citizensnpcs.api.CitizensAPI;
import net.citizensnpcs.api.event.NPCClickEvent;
import net.citizensnpcs.api.npc.NPC;
import net.citizensnpcs.api.npc.NPCRegistry;
import org.bukkit.Bukkit;
import org.bukkit.Location;
import org.bukkit.World;
import org.bukkit.entity.EntityType;
import org.bukkit.entity.Player;
import org.bukkit.event.EventHandler;
import org.bukkit.event.Listener;

public class HouseShopNPC implements Listener{

    public HouseShopNPC(Location loc){

        World hWorld = Bukkit.getWorld("HouseWorld");

        NPCRegistry registry = CitizensAPI.getNPCRegistry();

        NPC hNpc = registry.createNPC(EntityType.PLAYER, "Shop");
        hNpc.spawn(Bukkit.getWorlds().get(0).getSpawnLocation());

    }

    @EventHandler
    public void onClickEvent(NPCClickEvent e){

        Player plr = e.getClicker();

        plr.sendMessage("sdfsdf");

    }

}

我还在main.java文件中包括了CitizensAPI.setImplementation(new CitizensPlugin()) {...}，因为如果我不包括这一行，它将给我带来非法参数异常。

有人知道我该如何解决吗？

谢谢

Answer 1

不太确定Citizens API的所有详细信息，但是从Java错误中，我得出的结论是变量注册表（NPCRegistry对象）为空。

我还记得我在Mincraft期间的经历，您需要将要依赖于插件的API添加到plugin.yml。这意味着在您的情况下，您必须将plugin.yml的第一行更改为：

depend: [Citizens, Multiverse-Core]

如果执行此操作，通常应该可以照原样执行代码。您可以在此处找到更多信息（在“与公民挂钩”下）： https://wiki.citizensnpcs.co/API

Cobra_8

如何使用公民API生成NPC？

1 个答案: