code: Collection<MBeanServer> getMBeanServers() {
          Collection<MBeanServer> mbeanServers = new HashSet<MBeanServer>();
          mbeanServers.add(ManagementFactory.getPlatformMBeanServer());
          mbeanServers.addAll(MBeanServerFactory.findMBeanServer(null));
          return mbeanServers;
      }
docs: Get the set MBean servers that includes the platform MBean server and any
  that can be found with {@link MBeanServerFactory#findMBeanServer(String) findMBeanServer}.
  
  @return the set of discovered mbean servers