HierarchyDynamicMBean registered too many times w/ LoggerRepository. This can occur when: 1. start MBeanServer 2. register new HierarchyDynamicMBean (HDMBean) to MBeanServer 3. unregister HDMBean from MBeanServer 4. stop MBeanServer 5. repeat (1) - (3) LoggerReposity will still broadcast to old HDMBean [in addition to new HDMBean]. There is no API to unregister the MBean.