I'm sorry, I thought JGO would send me an email if someone replied. Apparently it didn't... Anyway, thanks for your reply
Why not just use Eclipse's export instead of command line if that's what works?
Well I don't use it on the command line manually, it's part of a script that packs the compiled classes, sources and javadoc in jars and a zip.
maybe there is a place to edit the arguments in Eclipse's options.
Yes, there's even an option to export the settings to an ANT script. I used the exact same flags but no difference.
Didn't find any help in the documentation as well :/
I hope your exam went well