At this time all my Java applications render blank in parallels. They open their windows and so on but the windows are always grey on the inside. Presumably, they're trying to use some Direct X acceleration method that doesn't work.
If anyone else has this problem, here's a temporary solution: start the java application, then go to Window's display settings. Reduce the amount of hardware acceleration and hit Apply. You can then change back to the previous level of acceleration - the action of changing the level is what matters, not what level you have.
If anyone else has this problem, here's a temporary solution: start the java application, then go to Window's display settings. Reduce the amount of hardware acceleration and hit Apply. You can then change back to the previous level of acceleration - the action of changing the level is what matters, not what level you have.