My bots don't work properly when I don't check the "Run natively" checbox in the simulator. They ignore all commands and just crash against the nearest wall.
The following exception is printed to the console:
Jul 20, 2007 2:25:35 PM ojvm.machine.ControlUnit makeAndThrow
INFO: new exception: java.lang.VerifyError, msg: No value at index 7 of LocalVars
failure to thinknull