After some unsuccessful search with google, I finnaly founf the reason for the error, maby you all know this allready but I found no hint and I think this should be mentioned:

Java 1.4.x is not working in a 24bpp environment!!!!!!!

(see http://developer.java.sun.com/develo...s/4517321.html )

As my 4mb grafic board can not handle 32bpp, I have to use java 1.3.x

stony