Java SE (Java Platform, Standard Edition)

Hello,
i've got a problem concerning selection with JOGL (not Java3D).
I created a simple programm in which the user should be able to select object but it doesn't work and since opengl is a bit harder to debug, i ask you:
my code:

Drawing Function:

public void DrawFrameNamed(BDSFrame f)
    {
        gl.glTranslatef(0.0f,0.0f,-10.0f);
        for(int i=0;i<f.objs.size();i++)
        {
            BDSObject cur = f.objs.get(i);
            gl.glLoadName(i+1);
            DrawReadyObject(cur);
        }

    }

PICKING:

public void SimpleClickSelection(int x,int y, BDSFrame f)
    {
        int bufsize = 32;
        IntBuffer selbuf = BufferUtil.newIntBuffer(bufsize);
        int[] viewport = new int[4];
        gl.glGetIntegerv(gl.GL_VIEWPORT,viewport,0);

	gl.glSelectBuffer(bufsize,selbuf);
	gl.glRenderMode(gl.GL_SELECT);
        

	gl.glMatrixMode(gl.GL_PROJECTION);
	gl.glPushMatrix();
	gl.glLoadIdentity();

	glu.gluPickMatrix(x,viewport[3]-y, 2.0d, 2.0d, viewport, 0);

        

	glu.gluPerspective(45, viewport[3]/viewport[2], 0.1, 1000);
        

	gl.glInitNames();


        gl.glMatrixMode(gl.GL_MODELVIEW_MATRIX);
        DrawFrameNamed(f);

        int hits;


	gl.glMatrixMode(gl.GL_PROJECTION);
	gl.glPopMatrix();
	gl.glMatrixMode(gl.GL_MODELVIEW);
        gl.glFlush();

	hits = gl.glRenderMode(gl.GL_RENDER);
        System.out.println("HITS:"+hits);

	
    }

it's always HITS=0 ? and i really don't know where the mistake is.
thanks ;)