Problem with Android Mesh Render

This time I had a problem with the actual rendering of my model. I can load all this through the loadGb () function of Libgdx and render it with GL10_Triangles, however I continue to get the missing triangles in my model (it seems that only half of the models render). I tried the old ObjLoad function (commented out) and also different rendering styles, but nothing works.

And yes, I checked the model in Blender and the model is completed without missing persons.

See print screen below and code below. Any help would be fantastic, it is very frustrating since I am so close to making it work.

And here is the code.

public class LifeCycle implements ApplicationListener {

Mesh model;
private PerspectiveCamera camera;

public void create() {

    InputStream stream = null;
    camera = new PerspectiveCamera(45, 4, 4);
    try 
    {
        stream = Gdx.files.internal("Hammer/test_hammer.obj").read();
        //model = ModelLoaderOld.loadObj(stream);
        model = ObjLoader.loadObj(stream,true);
        stream.close();
    } 
    catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

    Gdx.gl.glEnable(GL10.GL_DEPTH_TEST);
    Gdx.gl10.glTranslatef(0.0f, 0.0f, -3.0f);
}

protected float rotateZ = 0.1f;
protected float increment = 0.1f;

public void render()
{
    Gdx.app.log("LifeCycle", "render()");
    Gdx.gl.glClearColor(0.0f, 0.0f, 0.5f, 1.0f);
    Gdx.gl.glClear(GL10.GL_COLOR_BUFFER_BIT | GL10.GL_DEPTH_BUFFER_BIT);
    camera.update();
    camera.apply(Gdx.gl10);
    Gdx.gl10.glTranslatef(0.0f, 0.0f, -3.0f);
    Gdx.gl10.glRotatef(rotateZ, rotateZ, 5.0f, rotateZ);
    model.render(GL10.GL_TRIANGLES);

    rotateZ += increment;
    System.out.println(""+rotateZ);
}
}