I'm familiar with the remote server, but how does that help you call builtin (or other library) keywords from your java code. Also I'm fine w/ running the jython version of rf.
The constraint is more that I need to stay in java (not jython/python) for all keyword implementation and that seems to be raising important limitations, and without having entry points in org.robotframework.Robotframework (java internal api) that match up the python robot.* internal apis, I'm not sure how to work around them.