docs: private static MBeanServer setQueryExpServer(QueryExp query, MBeanServer toSet) {
          // We assume the QueryExp is a QueryEval subclass or uses the QueryEval thread local
          // mechanism to store any existing MBeanServer. If that's not the case we have no
          // way to access the old mbeanserver to let us restore it
          MBeanServer result = QueryEval.getMBeanServer();
          query.setMBeanServer(toSet);
          return result;
      }