What do you think about a GigaMeleeRumble?
What is the official java version to be used with robocode?
I personally use java 6 but I think some bots are compiled with java 7 and do not run on my machine. Shall I switch to java 7?
If you're using Sun/Oracle Java, I would strongly argue you should not be using Java 6 anymore, and should not have been for the last year, because you're not getting security updates.
If you're using OpenJDK instead of the Sun/Oracle version, you can still get security updates for Java 6, so that isn't an issue.
As OpenJDK 6 doesn't have official Windows builds, and Sun/Oracle Java 6 does not get security updates, perhaps it is best to as a rule not be using any version of Java 6 (even if it has recent security patches) for Roborumble, as new Windows users submitting bots cannot easily test with Java 6.