Error on args[0] equals null

I want my plugin to give a message when no arguments are given. I did it like this:

Code:

if(args[0].equalsIgnoreCase(null)){
    sender.sendMessage("Spelernaam mist. Doe /ap <spelernaam>");
return true;
}

But now it gives an error when I give no arguments.

Code:

2012-03-11 22:18:11 [SEVERE] null
org.bukkit.command.CommandException: Unhandled exception executing command 'ap' in plugin AddPlayer v0.1
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:42)
    at org.bukkit.command.SimpleCommandMap.dispatch(SimpleCommandMap.java:166)
    at org.bukkit.craftbukkit.CraftServer.dispatchCommand(CraftServer.java:469)
    at net.minecraft.server.NetServerHandler.handleCommand(NetServerHandler.java:906)
    at net.minecraft.server.NetServerHandler.chat(NetServerHandler.java:866)
    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:849)
    at net.minecraft.server.Packet3Chat.handle(Packet3Chat.java:33)
    at net.minecraft.server.NetworkManager.b(NetworkManager.java:229)
    at net.minecraft.server.NetServerHandler.a(NetServerHandler.java:116)
    at net.minecraft.server.NetworkListenThread.a(NetworkListenThread.java:78)
    at net.minecraft.server.MinecraftServer.w(MinecraftServer.java:554)
    at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:452)
    at net.minecraft.server.ThreadServerApplication.run(SourceFile:490)
Caused by: java.lang.ArrayIndexOutOfBoundsException: 0
    at me.Grovert11.AddPlayer.apcommand.onCommand(apcommand.java:30)
    at org.bukkit.command.PluginCommand.execute(PluginCommand.java:40)
    ... 12 more

How to solve this?

 

use

Code:java

if(args.length == 0){
//they didn't type anything after
}

 

To explain why.

Code:java

 
if(args[0].equalsIgnoreCase(null)){
    sender.sendMessage("Spelernaam mist. Doe /ap <spelernaam>");
return true;
}
 

What is happening here is args is null, you are trying to call a method to a null object. This is always going to throw an NPE if though in theory checking if null.equals(null) would work.

 

Thank you both! It is now working