protected void initCrossHairs() {
    setDisplayStatView(false);
    //guiFont = assetManager.loadFont("Interface/Fonts/Default.fnt");
    BitmapText ch = new BitmapText(guiFont);
    ch.setSize(guiFont.getCharSet().getRenderedSize() * 2);
    ch.setText("+");        // fake crosshairs :)
    ch.setLocalTranslation( // center
      settings.getWidth() / 2,
      settings.getHeight() / 2, 0);
    guiNode.attachChild(ch);
  }
A plus sign used as crosshairs to help the player with aiming.
jme3-examples/src/main/java/jme3test/helloworld/HelloPhysics.java