public void goBack() throws Exception { root.history.goPrevious(); view.setDocument(root.history.getCurrentDocument(), url.toString());
public void goBack() { String uri = manager.getBack(); view.setDocument(uri);
    public void goBack()            throws Exception {        root.history.goPrevious();        view.setDocument(root.history.getCurrentDocument(), url.toString());        updateButtons();    }