Vertex label in JUNG graph visualization

Question

I wrote a little graph visualizer class:

    public void simpleGraph(SparseMultigraph<Vertex,SEdge> graph, String name) {

    Layout<Vertex, SEdge> layout = new ISOMLayout(graph);
    layout.setSize(new Dimension(800,800));
    BasicVisualizationServer<Vertex, SEdge> vv = new BasicVisualizationServer<Vertex, SEdge>(layout);
    vv.setPreferredSize(new Dimension(850,850)); //Sets the viewing area size

    JFrame frame = new JFrame(name);
    frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    frame.getContentPane().add(vv); 
    frame.pack();
    frame.setVisible(true);                 
}

How can I add labels for vertices and edges? The Values are stored in my custom vertex class. Can I iterate over all vertices in the Layout or BasicVisualizationServer and add labels?

Thanks for your help!