@Override
    public void simpleUpdate(float tpf) {
        long currentTime = System.currentTimeMillis();

        if (currentTime - sysTime > 8000) {
            count++;
            if (count >= cursors.size()) {
                count = 0;
            }
            sysTime = currentTime;
            // 8 seconds have passed,
            // tell jME3 to switch to a different cursor.
            inputManager.setMouseCursor(cursors.get(count));
        }

    }
This test class demonstrate how to change cursor in jME3.

NOTE: This will not work on Android as it does not support cursors.

Cursor test
@author MadJack
jme3-examples/src/main/java/jme3test/gui/TestCursor.java