Dear Attila,
did you also try your solution in an Eclipse Plugin? Things work a bit differently there, because of its OSGI foundation. There is no global (class)path and you cannot pass arguments in the command line. Instead you have to specify all these settings in the Plugin (bundle) MANIFEST.MF.
If you can connect to GFv3, then please let us know. We've been stuck for weeks now.
Thanks,
Andreas (Budapest)
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