The implementation jar of sshj on maven central already has proper OSGI manifest headers, which makes it easy to put that jar into a p2 repository to use sshj as an Eclipse bundle.

But the source jar does not have the appropriate OSGI manifest headers. If one puts the source jar into a p2 repository for use in a target platform, the Eclipse IDE will not find and show the Java sources when debugging.

I am willing to help with this, but I do not know gradle (only maven).