Sorry for the traffic, it seems some other errors confused GCJ... One really last question: If the native methode (JNI) doesnt match the java methode, what will be thrown? GIJ tells me: Exception in thread "main" java.lang.UnsatisfiedLinkError: libawt: file not found But libawt.so (also tried "awt") is in ld-libraray-path.... lg Clemens