Java Error: Could not find or load main class. Fedora 17 xfce

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http://forums.fedoraforum.org – I've been trying to play minecraft on Fedora, but no version of java will let me play it. I had it working when I was using lxde, but when I installed the xfce version I can't get it to work. I always get the Code: Error: Could not find or load main class message when trying to open a jar file in the terminal. I've tried the java jdk, jre, and openjdk with no luck. Any idea as to where I should start to resolve this? (HowTos)