Java SE (Java Platform, Standard Edition)

Hello everybody,

I made an application in Eclipse in Windows, which worked perfectly until I tried to use the same source code in Ubuntu. When I run it in Ubuntu, the GUI shows up, and the program works until I place the pointer on top of the program's window. When I do so, the program freezes and after a couple of seconds I get a message telling me that the program is not responding.

The weirdest thing is that I can run it without problem by using only the keyboard, by tabbing between the buttons of the GUI. If I do so, it works without any problems, and the output is exactly what I expect it to be.

I also tried to compile it outside of Eclipse with gcj and I get the same result: It works perfectly until I place the pointer on top of the window.

Does anybody know what the problem may be? I'm sorry that I didn't post the code. The reason is that it is quite long.

I would appreciate if anybody could help me, thanks!