Bukkit配置文件创建错误

问题描述：

我对编程bukkit插件很陌生，所以如果答案很明显，请尽量简单。我试图创建第二个配置文件来存储位置和其他数据，但是当我运行我的插件时，我不断收到NullPointerException。Bukkit配置文件创建错误

这里是我的代码：

package blah.blah.blah.XD; 

import java.io.File; 
import java.io.IOException; 
import java.io.InputStream; 
import java.util.ArrayList; 
import java.util.List; 
import java.util.Set; 
import java.util.logging.Level; 

import org.bukkit.Location; 
import org.bukkit.configuration.file.FileConfiguration; 
import org.bukkit.configuration.file.YamlConfiguration; 
import org.bukkit.event.Listener; 
import org.bukkit.plugin.java.JavaPlugin; 

public class KingdomLocationsFile extends JavaPlugin implements Listener{ 

    public Kingdoms plugin; 

    public KingdomLocationsFile(Kingdoms plugin) { 
     this.plugin = plugin; 
    } 

    private File KingdomLocationsFile; 
    private FileConfiguration KingdomLocations; 

    public void reloadKingdomLocations() { 
     if (KingdomLocationsFile == null) { 
      KingdomLocationsFile = new File(getDataFolder(), "KingdomLocations.yml"); 
     } 
     KingdomLocations = YamlConfiguration.loadConfiguration(KingdomLocationsFile); 

     // Look for defaults in the jar 
     InputStream defConfigStream = plugin.getResource("KingdomLocations.yml"); 
     if (defConfigStream != null) { 
      YamlConfiguration defConfig = YamlConfiguration.loadConfiguration(defConfig 
       Stream); 
      KingdomLocations.setDefaults(defConfig); 
     } 
    } 

    public FileConfiguration getKingdomLocations() { 
     if (KingdomLocations == null) { 
      this.reloadKingdomLocations(); 
     } 
     return KingdomLocations; 
    } 

    public void saveKingdomLocations() { 
     if (KingdomLocations == null || KingdomLocationsFile == null) { 
     return; 
     } 
     try { 
      getKingdomLocations().save(KingdomLocationsFile); 
     } catch (IOException ex) { 
      this.getLogger().log(Level.SEVERE, "Could not save config to " + KingdomLoc 
       ationsFile, ex); 
     } 
    } 

    public boolean force = false; 

    public List<Location> getLocationsList(final String path) { 
     final List<Location> List = new ArrayList<Location>(); 
     if (this.KingdomLocations.contains(path) && this.KingdomLocations.isConfigu 
       rationSection(path)) { 
      final Set<String> keys = this.KingdomLocations.getConfigurationSect 
         ion(path).getKeys(false); 
      if (keys.size() > 0) { 
       final Location[] key = (Location[]) keys.toArray(); 
       for (final Location element : key) { 
        List.add(this.getKingdomLocation(path +"." +(Locati 
             on) element)); 
       } 
      } 
     } 
     return List; 
    } 

    private Location getKingdomLocation(String path) { 
     Location loc = (Location) this.KingdomLocations.get(path); 
     return loc; 
    } 
}

...这里是错误：

C:\Users\Mark\Desktop\Plugin Test Server>java -Xms1024M -Xmx1024M -jar craftbukk 
it-1.5.1-R0.1-20130326.111705-23.jar -o true 
229 recipes 
27 achievements 
16:06:39 [INFO] Starting minecraft server version 1.5.1 
16:06:39 [INFO] Loading properties 
16:06:39 [INFO] Default game type: SURVIVAL 
16:06:39 [INFO] Generating keypair 
16:06:39 [INFO] Starting Minecraft server on *:25565 
16:06:39 [INFO] This server is running CraftBukkit version git-Bukkit-1.4.7-R1.0 
-75-g7f25632-b2717jnks (MC: 1.5.1) (Implementing API version 1.5.1-R0.1-SNAPSHOT 
) 
16:06:39 [INFO] [Kingdoms] Loading Kingdoms v1.0 
16:06:39 [INFO] Preparing level "world" 
16:06:39 [INFO] Preparing start region for level 0 (Seed: 3764664766498884770) 
16:06:40 [INFO] Preparing start region for level 1 (Seed: 3764664766498884770) 
16:06:40 [INFO] Preparing spawn area: 20% 
16:06:41 [INFO] Preparing start region for level 2 (Seed: 3764664766498884770) 
16:06:41 [INFO] [Kingdoms] Enabling Kingdoms v1.0 
16:06:41 [SEVERE] Error occurred while enabling Kingdoms v1.0 (Is it up to date? 
) 
java.lang.NullPointerException 
    at com.treeclimber17.kingdoms.KingdomLocationsFile.reloadKingdomLocation 
s(KingdomLocationsFile.java:35) 
    at com.treeclimber17.kingdoms.KingdomLocationsFile.getKingdomLocations(K 
ingdomLocationsFile.java:44) 
    at com.treeclimber17.kingdoms.Kingdoms.onEnable(Kingdoms.java:14) [THIS PROBABLY   DOESN't MATTER...] 
    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(SimplePluginManage 
r.java:381) 
    at org.bukkit.craftbukkit.v1_5_R2.CraftServer.loadPlugin(CraftServer.jav 
a:282) 
    at org.bukkit.craftbukkit.v1_5_R2.CraftServer.enablePlugins(CraftServer. 
java:264) 
    at net.minecraft.server.v1_5_R2.MinecraftServer.j(MinecraftServer.java:3 
01) 
    at net.minecraft.server.v1_5_R2.MinecraftServer.e(MinecraftServer.java:2 
80) 
    at net.minecraft.server.v1_5_R2.MinecraftServer.a(MinecraftServer.java:2 
40) 
    at net.minecraft.server.v1_5_R2.DedicatedServer.init(DedicatedServer.jav 
a:150) 
    at net.minecraft.server.v1_5_R2.MinecraftServer.run(MinecraftServer.java 
:379) 
    at net.minecraft.server.v1_5_R2.ThreadServerApplication.run(SourceFile:5 
73) 
16:06:41 [INFO] Server permissions file permissions.yml is empty, ignoring it 
16:06:41 [INFO] Done (1.885s)! For help, type "help" or "?"

另外，请尝试阅读http://linuxsilo.net/docs/smart-questions_en.html – AJMansfield 2013-03-27 20:23:39

答

你应该保持bukkit自己的支持页面上bukkit有关的问题（因为它是一个API），在这里找到：http://forums.bukkit.org/forums/plugin-development.5/

也就是说，尝试使用try-catch来查看语句是否仍然为null：

KingdomLocations = YamlConfiguration.loadConfiguration(KingdomLocationsFile);

喜欢的东西：

try { 
    KingdomLocations = YamlConfiguration.loadConfiguration(KingdomLocationsFile); 
} catch (Exception e) { 
    System.out.println("Exception caught in method"); 
    System.out.println(e.printStackTrace()); 
}

写意的位，但没有在手/行号的API，它是很难挑选出来的问题到底是什么。

Bukkit配置文件创建错误

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