How to start Minecraft

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http://askubuntu.com – Before starting I want to state that the following 2 links are already done: How can I install Minecraft? How do I install Java? I have the .minecraft folder in my user folder (/home/cyrex/.minecraft). The minecraft.jar file has the executable flag. The minecraft version is the 1.2.5. I have OpenJRE AND OpenJDK installed with version 1.6 and 1.7 (1.6 default). Already installed the liblwjgl-java library. Still the game when I run it via terminal or via the Open With option with OpenJDK 1.6 throws me the following error (In terminal): Exception in thread "main" java.lang.NoClassDefFoundErr (HowTos)