// POST
final DeleteQuery deleteQuery = new DeleteQuery(HOSTNAME, PORT, PATH, SECURE);
authentication.authenticate(deleteQuery);
queryGroup.add(deleteQuery);
queryGroup.execute(new TaskListener<Void>() {
@SuppressWarnings("unchecked")
@Override
public synchronized void taskExecuted(Task<Void> task) {
Dictionary<String, Object> result = (Dictionary<String, Object>)getQuery.getResult();