Java Scene Graph is a Java library that implements a scene graph, and is/was the engine that drove the graphics for JavaFX. This talk covered the open source Java Scene Graph project on java.net. This project, and indeed the java.net site no longer exist.
Even by the time of this talk, this project on java.net was in very ill health. Sun was purchased by Oracle and plans evidently changed. JavaFX itself never played the game changing role that was envisioned.