Line Problems in Linux ...

Hi
i write a simple program, which only draws a few Lines in a JFrame. It works fine in Windows. But it makes problems on my Linux (Ubuntu) OS, allthough the java versions are the same on both systems.
"Java (TM) 2 Runtime Environment, Standard Edition (build 1.5.0._05-b05) ... "
If i start the programm in linux, the lines will be shown only for a few milliseconds. (or sometimes so fast, that i can't see it ) and after that the Frame is blank ( simple problem with "public void paint ( graphics g ), i think"
i don't know if i'm in the right forum, my first thought was, it's maybe a bug in the jre.
But i think my codestyle is rather a bit dirty with the 2D Graphics and the windows java machine is maybe more tolerant than my linux machine.
http://www.inravage.net/M.java
here you can see the current source-code ( it's not very much )
So if you have a good idea, why it doesn't works under Linux, i'll be very grateful.

Did you find the problem? I got the same problem (i know the cose is not as good as it could be, cause i take a old code part from a older project, but it work #1 on windows).
thx a lot

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