Swing(jFrame) can not initialize

Well, sdk/jme3-gui/src/com/jme3/gde/gui/swing/ConvertToNifty.java at ce9d702d33c4906d98f0b7381c945b2bfcaa9f90 · jMonkeyEngine/sdk · GitHub… It looks to probably convert all the project’s Swing classes to NiftyGui, through some generator. That would be my guess. As to whether it works or not… Can’t really tell…