}
private void deleteDefaultServerView(ActionRequest actionRequest, ActionResponse actionResponse) throws Exception {
try {
userTransaction.begin();
Node node = entityManager.find(Node.class, "Default Server");
if (node != null) {
List<Graph> graphs = entityManager.createNamedQuery("graphsByNode").setParameter("name", node.getName()).getResultList();
if (!(graphs == null || graphs.isEmpty())) {
for (Graph graph : graphs) {
List<View> views = graph.getViews();
for (View view : views) {
entityManager.remove(view);