NPE on method from another class not working

Discussion in 'Plugin Development' started by malandrix_bunny, May 30, 2014.

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  1. Offline

    malandrix_bunny

    So I was trying to make a nickname command for my server and I just can't seem to use methods from another class. I tried to make constructors but saw no improvement. I have been able to do this in my other plugins but I can't seem to get it to work here.
    NPE:
    Code:
    [18:06:42] [Server thread/INFO]: malandrix_bunny issued server command: /nick mal Silly_goose
[18:06:42] [Server thread/WARN]: java.lang.NullPointerException
[18:06:42] [Server thread/WARN]:    at net.bunnehrealm.utilities.MainClass.loadPlayers(MainClass.java:49)
[18:06:42] [Server thread/WARN]:    at net.bunnehrealm.utilities.commands.NickCommand.onCommand(NickCommand.java:36)
[18:06:42] [Server thread/WARN]:    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44)
[18:06:42] [Server thread/WARN]:    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180)
[18:06:42] [Server thread/WARN]:    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:701)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:956)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:817)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469)
[18:06:42] [Server thread/WARN]:    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628)
[18:06:42] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'nick' in plugin REALMUtilities v1.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:701) ~[spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:956) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:817) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
Caused by: java.lang.NullPointerException
    at net.bunnehrealm.utilities.tools.NameManager.setDisplayName(NameManager.java:23) ~[?:?]
    at net.bunnehrealm.utilities.commands.NickCommand.onCommand(NickCommand.java:38) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    ... 13 more
    NameManager:
    Code:java
    1. package net.bunnehrealm.utilities.tools;
    2.  
    3. import org.bukkit.ChatColor;
    4. import org.bukkit.entity.Player;
    5. import org.bukkit.plugin.Plugin;
    6.  
    7. import net.bunnehrealm.utilities.MainClass;
    8. import net.bunnehrealm.utilities.commands.NickCommand;
    9. public class NameManager {
    10.     public NameManager NameManager;
    11.     public MainClass MainClass;
    12.     public NameManager(MainClass MainClass){
    13.         this.MainClass = MainClass;
    14.     }
    15.     public NickCommand NickCommand;
    16.     public NameManager(NickCommand NickCommand){
    17.         this.NickCommand = NickCommand;
    18.     }
    19.  
    20.     public void setDisplayName(Player p, String tabname){
    21.         tabname = tabname + ChatColor.RESET;
    22.         p.setDisplayName(tabname.replaceAll("&([0-9a-f])", "\u00A7$1"));
    23.         MainClass.players.set(p.getUniqueId().toString() + ".tab-Name", tabname);
    24.     }
    25.     public void setTabName(Player p, String tabname){
    26.         tabname = tabname + ChatColor.RESET;
    27.         p.setPlayerListName(tabname.replaceAll("&([0-9a-f])", "\u00A7$1"));
    28.         MainClass.players.set(p.getUniqueId().toString() + ".Tab-Name", tabname);
    29.     }
    30. }

    NickCommand:
    Code:java
    1. package net.bunnehrealm.utilities.commands;
    2.  
    3. import net.bunnehrealm.utilities.tools.NameManager;
    4.  
    5. import org.bukkit.Bukkit;
    6. import org.bukkit.ChatColor;
    7. import org.bukkit.command.Command;
    8. import org.bukkit.command.CommandExecutor;
    9. import org.bukkit.command.CommandSender;
    10. import org.bukkit.entity.Player;
    11.  
    12. import net.bunnehrealm.utilities.MainClass;
    13.  
    14. public class NickCommand implements CommandExecutor{
    15.     public MainClass MainClass;
    16.     public NickCommand(MainClass MainClass){
    17.         this.MainClass = MainClass;
    18.     }
    19.     public NickCommand(NameManager NameManager){
    20.         this.nm = NameManager;
    21.     }
    22.     public NameManager nm = new NameManager(MainClass);
    23.     @Override
    24.     public boolean onCommand(CommandSender cs, Command command,
    25.             String label, String[] args) {
    26.  
    27.         if(label.equalsIgnoreCase("nick")){
    28.             if(!(cs.hasPermission("realmutilities.commands.nick") || cs.isOp())){
    29.                 cs.sendMessage(ChatColor.RED + "You do not have permission to do this.");
    30.             }
    31.             else{
    32.                 if(args.length != 2){
    33.                     cs.sendMessage("Correct usage is /nick playername displayname");
    34.                 }
    35.                 else{
    36.                     MainClass.loadPlayers();
    37.                     Player p = Bukkit.getPlayer(args[0]);
    38.                     nm.setDisplayName(p, args[1]);
    39.                     nm.setTabName(p, args[1]);
    40.                     MainClass.savePlayers();
    41.                 }
    42.             }
    43.         }
    44.         return false;
    45.     }
    46.  
    47. }
    48.  

    MainClass:
    Code:java
    1. package net.bunnehrealm.utilities;
    2.  
    3. import java.io.File;
    4.  
    5.  
    6.  
    7.  
    8. import net.bunnehrealm.utilities.commands.NickCommand;
    9. import net.bunnehrealm.utilities.tools.NameManager;
    10.  
    11. import org.bukkit.configuration.file.FileConfiguration;
    12. import org.bukkit.plugin.Plugin;
    13. import org.bukkit.plugin.java.JavaPlugin;
    14.  
    15. public class MainClass extends JavaPlugin{
    16.     public MainClass MainClass;
    17.     public NameManager NameManager = new NameManager(this);
    18.     public Plugin plugin = this;
    19.     public File playersFile;
    20.     public FileConfiguration players;
    21.     public NickCommand nc = new NickCommand(this);
    22.     public void onDisable(){
    23.         getLogger().info("REALMUtilities has been disabled.");
    24.     }
    25.     public void onEnable(){
    26.         MainClass = this;
    27.         getLogger().info("REALMUtilities has been enabled.");
    28.         try {
    29.             firstPlayerRun();
    30.         } catch (Exception e) {
    31.             System.out.println("Could not run firstPlayerRun");
    32.             e.printStackTrace();
    33.         }
    34.         loadPlayers();
    35.         savePlayers();
    36.         getCommand("nick").setExecutor(nc);
    37.     }
    38.     public void firstPlayerRun() throws Exception {
    39.         if (!playersFile.exists()) {
    40.             getLogger().info("Creating a bans.yml file");
    41.             playersFile.getParentFile().mkdirs();
    42.             playersFile.createNewFile();
    43.  
    44.         }
    45.     }
    46.  
    47.     public void loadPlayers() {
    48.         try {
    49.             players.load(playersFile);
    50.         } catch (Exception e) {
    51.             e.printStackTrace();
    52.         }
    53.     }
    54.     public void savePlayers() {
    55.         try {
    56.             players.save(playersFile);
    57.         } catch (Exception e) {
    58.             e.printStackTrace();
    59.         }
    60.     }
    61.  
    62. }

    Thanks for the cooperation
     
    malandrix_bunny, May 30, 2014
    #1
  2. Offline

    iTornado1234

    java.lang.NullPointerException <- Something in your main class is null, line 49. The loadplayers method.
     
    iTornado1234, May 30, 2014
    #2
  3. Offline

    malandrix_bunny

    iTornado1234 Fixed that but now a new error is here.
    Code:
    [18:34:53] [Server thread/ERROR]: null
org.bukkit.command.CommandException: Unhandled exception executing command 'nick' in plugin REALMUtilities v1.0
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:46) ~[spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:180) ~[spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at org.bukkit.craftbukkit.v1_7_R3.CraftServer.dispatchCommand(CraftServer.java:701) ~[spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.PlayerConnection.handleCommand(PlayerConnection.java:956) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.PlayerConnection.a(PlayerConnection.java:817) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.a(PacketPlayInChat.java:28) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.PacketPlayInChat.handle(PacketPlayInChat.java:47) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.NetworkManager.a(NetworkManager.java:157) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.ServerConnection.c(SourceFile:134) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.v(MinecraftServer.java:667) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.DedicatedServer.v(DedicatedServer.java:260) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.u(MinecraftServer.java:558) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.MinecraftServer.run(MinecraftServer.java:469) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    at net.minecraft.server.v1_7_R3.ThreadServerApplication.run(SourceFile:628) [spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
Caused by: java.lang.NullPointerException
    at net.bunnehrealm.utilities.tools.NameManager.setDisplayName(NameManager.java:23) ~[?:?]
    at net.bunnehrealm.utilities.commands.NickCommand.onCommand(NickCommand.java:38) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    ... 13 more
     
    malandrix_bunny, May 30, 2014
    #3
  4. Offline

    iTornado1234

    malandrix_bunny Still have a NullPointerException.
    Code:
    Caused by: java.lang.NullPointerException
    at net.bunnehrealm.utilities.tools.NameManager.setDisplayName(NameManager.java:23) ~[?:?]
    at net.bunnehrealm.utilities.commands.NickCommand.onCommand(NickCommand.java:38) ~[?:?]
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:44) ~[spigot.jar:git-Bukkit-1.7.9-R0.1-b3084jnks]
    ... 13 more
     
    iTornado1234, May 30, 2014
    #4
  5. Offline

    fireblast709

    malandrix_bunny don't use MainClass in NickCommand before you initialized it, and don't create multiple instance of the same class, one in the main class should be enough (+ having it in the same class would be a bit redundant, wouldn't it)
     
    fireblast709, May 30, 2014
    #5
  6. Offline

    JaguarJo

    Locked. Unfortunately it looks like you're not using our software. Please seek support from the makers of your server build.
     
    JaguarJo, May 30, 2014
    #6
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