NullPointerException

Hello
I tried to make a plugin that adds something on signs.
My problem is that I cant enable the plugin because of a NullPointerException-Error.
Here the errorcode:

Code:

2012-06-26 23:04:55 [INFO] [SignNews] Enabling SignNews v0.1
2012-06-26 23:04:55 [SEVERE] Error occurred while enabling SignNews v0.1 (Is it up to date?)
java.lang.NullPointerException
at com.github.henne90gen.SignNews.onEnable(SignNews.java:25)
at org.bukkit.plugin.java.JavaPlugin.setEnabled(JavaPlugin.java:215)
at org.bukkit.plugin.java.JavaPluginLoader.enablePlugin(JavaPluginLoader.java:337)
at org.bukkit.plugin.SimplePluginManager.enablePlugin(SimplePluginManager.java:381)
at org.bukkit.craftbukkit.CraftServer.loadPlugin(CraftServer.java:256)
at org.bukkit.craftbukkit.CraftServer.enablePlugins(CraftServer.java:238)
at net.minecraft.server.MinecraftServer.t(MinecraftServer.java:381)
at net.minecraft.server.MinecraftServer.a(MinecraftServer.java:368)
at net.minecraft.server.MinecraftServer.init(MinecraftServer.java:197)
at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:432)
at net.minecraft.server.ThreadServerApplication.run(SourceFile:492)

Here are the other files of my plugin:
MainFile:

Code:

package com.github.henne90gen;
 
import java.util.logging.Logger;
 
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandSender;
import org.bukkit.configuration.Configuration;
import org.bukkit.entity.Player;
import org.bukkit.event.block.Action;
import org.bukkit.plugin.java.JavaPlugin;
 
public class SignNews extends JavaPlugin{
 
Logger log = Logger.getLogger("Minecraft");
 
public SignNewsCommands sncmd;
Config config;
 
String px = ChatColor.AQUA+"[SignNews] "+ChatColor.WHITE;
 
public void onEnable(){
//Befehle
sncmd = new SignNewsCommands(this);
getCommand("signnews").setExecutor(sncmd);
 
//Config
config = new Config(this);
 
log.info("SignNews enabled!");
}
 
public void onDisable(){
this.saveConfig();
log.info("SignNews disabled!");
}
}

CommandFile:

Code:

package com.github.henne90gen;
 
import org.bukkit.ChatColor;
import org.bukkit.command.Command;
import org.bukkit.command.CommandExecutor;
import org.bukkit.command.CommandSender;
import org.bukkit.configuration.Configuration;
import org.bukkit.entity.Player;
import org.bukkit.event.block.Action;
import org.bukkit.inventory.ItemStack;
 
public class SignNewsCommands implements CommandExecutor {
 
SignNews plg;
String px;
 
public SignNewsCommands (SignNews plg) {
this.plg = plg;
this.px = plg.px;
}
 
@Override
public boolean onCommand(CommandSender sender, Command cmd, String label, String[] args) {
if (sender instanceof Player) {
Player p = (Player) sender;
 
//Spielerbefehl "/setsignnews ohne Argumnte
if (args.length < 1) {
if (cmd.getName().equalsIgnoreCase("signnews")) {
p.sendMessage(ChatColor.RED + "Diese Argumente kannst du verwenden:");
p.sendMessage(ChatColor.RED + "create  Eine neue News-Wand erstellen");
}
} else {
if (args.length == 1) return ExecuteCmd(p, args[0]);
if (args.length == 2) return ExecuteCmd(p, args[0], args[1]);
if (args.length == 3) return ExecuteCmd(p, args[0], args[1], args[2]);
}
}
return false;
}
 
public boolean ExecuteCmd(Player p, String cmd) {
return false;
}
 
public boolean ExecuteCmd(Player p, String cmd, String arg) {
return false;
}
 
public boolean ExecuteCmd(Player p, String cmd, String arg1, String arg2) {
return false;
}
 
}

ConfigFile:

Code:

package com.github.henne90gen;
 
import org.bukkit.configuration.Configuration;
import org.bukkit.event.block.Action;
import org.bukkit.plugin.java.JavaPlugin;
 
public class Config {
private SignNews plugin;
private Configuration config;
public String msg1, msg2, msg3;
public boolean invertMouse;
public Action clickAktion;
 
public Config(SignNews plugin) {
this.plugin = plugin;
config = plugin.getConfig().getRoot();
config.options().copyDefaults(true);
plugin.saveConfig();
getOpts();
}
public void getOpts() {
msg1 = "Config.messages.broadcast1";
msg2 = "Config.messages.broadcast2";
msg3 = "Config.messages.broadcast3";
 
}
}

plugin.yml

Code:

name: SignNews
version: 0.1
description: Post something new on your sign!
author: henne90gen
website:  http://bukkit.org/
 
main: com.github.henne90gen.SignNews
 
commands:

I did not added the commands so far.

PS: Sorry for my bad english I'm german

 

What line has number 25, and learn Java before you make a plugin.

 

Thanks for your answer!
line number 25 is:
getCommand("signnews").setExecutor(sncmd);

 

Don't do the sncmd but write it full and do you have a constructor in the class that has to execute the command?

 

The code I posted above was all I have in my plugin.
So can you look through it? Im a beginner so I dont know what you mean with "constructor" Im sorry.
The first thing you said was something with write full so what is "full" for you?

 

henne90gen
Dreeass is asking whether you put a reference to your main class in your command executor. If so, you need to add the argument of (this) when registering your command.

 

Like this:
getCommand("signnews").setExecutor(this.sncmd);

 

Nope, that's not what a constructor is.
A constructor is a specific method that is called when you use

Code:java

 
new MyClass(...)
 

More info: http://www.javabeginner.com/learn-java/java-constructors

[edit]
henne90gen
The reason why you are getting a NullPointerException is because you want to register the command "signnews" which you never defined in your plugin.yml

 

mmh thanks alot!
I thought: "Oh lets do that later." and now I stand there dumb.
Now everything is running correct!
Thanks

 

Pandemoneus
Oh. I'm wrong then. I got it mixed up with parameter.