@Override
            public Boolean call() throws Exception {
                detachedPhysicsLastUpdate = System.currentTimeMillis();
                pSpace = new PhysicsSpace(worldMin, worldMax, broadphaseType);
                pSpace.addTickListener(app);
                return true;
            }
Allocate the physics space and start physics for ThreadingType.PARALLEL.

@return true if successful, otherwise false
jme3-jbullet/src/main/java/com/jme3/bullet/BulletAppState.java