Using JOGL with QtJambi

Question

I’m trying to use JOGL with QtJambi. I’m using code I found in tutorials (some of them are very old) and forums but nothing is displayed. The QGLWidget initialization prevents the window to be displayed. I have no error in the console. The program is running, but there is no window.

Is there something I’m doing wrong ?

Here is my code.

The GLWidget

    public class QtJOGLTestGLWidget extends QGLWidget
{
    protected GLContext context; 
    protected GL gl; 

    public QtJOGLTestGLWidget()
    {
        this(null); 
    }

    public QtJOGLTestGLWidget(QWidget parent)
    {
        super(parent); 
    }

    @Override
    protected void initializeGL()
    {
        GLProfile profile = GLProfile.get(GLProfile.GL2); 
        GLCapabilities glCaps = new GLCapabilities(profile); 
        glCaps.setPBuffer(true); 
        GLDrawableFactory factory = GLDrawableFactory.getFactory(profile); 
        context().makeCurrent(); 
        this.context = factory.createExternalGLContext(); 
        this.context.makeCurrent(); 
        this.gl = this.context.getGL(); 
    }

    @Override 
    protected void resizeGL(int w, int h)
    {
        GL2 gl2 = this.gl.getGL2(); 
        gl2.glViewport(0, 0, w, h);
        gl2.glMatrixMode(GL2.GL_PROJECTION);
        float r = 3.0f / 2.0f;
        gl2.glLoadIdentity();
        gl2.glFrustum(-0.2, 1 * r, -0.2, 1.2, 1, 2000);
    }

    @Override
    protected void paintGL()
    {
        GL2 gl2 = this.gl.getGL2(); 

        gl2.glMatrixMode(GL2.GL_MODELVIEW);
        gl2.glLoadIdentity();

        gl2.glBegin(GL.GL_TRIANGLES);
        {
            gl2.glColor3f(1, 0, 0);
            gl2.glVertex3f(0, 0, -1);
            gl2.glColor3f(0, 1, 0);
            gl2.glVertex3f(0, 1, -1);
            gl2.glColor3f(0, 0, 1);
            gl2.glVertex3f(1, 0, -1);
        }
        gl2.glEnd();
    }
}

The window

    public class QtJOGLTestFrame extends QMainWindow
{
    protected QtJOGLTestGLWidget glWidget; 
    protected QGridLayout gridLayout; 

    public QtJOGLTestFrame()
    {
        this.gridLayout = new QGridLayout(); 
        this.glWidget = new QtJOGLTestGLWidget(this); // This line prevents the window to be displayed 
        this.gridLayout.addWidget(this.glWidget, 0, 0); 

        QWidget widget = new QWidget(); 
        widget.setLayout(this.gridLayout); 
        this.setCentralWidget(widget); 
        this.setWindowTitle("Hello JOGL");
    }
}

Main

    public class QtJOGLTest
{
    public static void main(String[] args)
    {
        QApplication.initialize(args);
        QtJOGLTestFrame frame = new QtJOGLTestFrame(); 
        frame.resize(800, 600); 
        frame.show(); 
        QApplication.execStatic();
    }
}

I'm using the last version of JOGL and Mac OS X Sierra.

Thank you in advance.