Someone on this list pointed me to the BCEL parser, and I have corrected the bug in GenJar which now use that parser to get the classes a class file depends on.
My GenJar is working again in Ant. I tried to communicate with the person who was managing the GenJar project on Sourceforge, and I suppose including this correction to make version 1.0.3 (1.0.2 exists since 2003). But if I can't communicate with him, can someone suggest me a way to distribute this corrected version ? One more thing: I could make myself a sourceforge project with this, but I'm an old guy, and will be retired in a few years, so the question will surface again... Thanks François