public static void checkGLError() {
        if (!ENABLE_ERROR_CHECKING) {
            return;
        }
        int error = glGetError();
        if (error != 0) {
            String message = null;//GLU.gluErrorString(error);
            if (message == null) {
                throw new RendererException("An unknown [" + error + "] OpenGL error has occurred.");
            } else {
                throw new RendererException("An OpenGL error has occurred: " + message);
            }
        }
    }
A private constructor to inhibit instantiation of this class.
jme3-ios/src/main/java/com/jme3/renderer/ios/JmeIosGLES.java