test fails only on oel6 but should fails on all platforms:
MouseMotionListener is added to choice1 in init(), than robot move mouse to center of choice1 in testMouseMoveOutside(), at this moment mouseMoved() start work and generate exception

MouseMotionListener should be added after robot moved mouse to center, but it is very strange that test works fine on solaris, I think it still will not be valid for solaris after modification

test failed on solaris and other linux too if do following steps:
1. run command to start test in terminal
2. move mouse so that it was over choice and wait until test is executed
3. click mouse (terminal will get focus)
4. start test again

test also failed on other platform if move mouse over choice manually before choice is opened

tested for jdk6 and jdk7
see comments for more details