LifecycleManager.java

@Override
    public synchronized void close()
    {
        if ( state.compareAndSet(State.STARTING, State.CLOSED) || state.compareAndSet(State.STARTED, State.CLOSED) )
        {
            try
            {
                if (newLifecycleManager != null) {
                    newLifecycleManager.notifyShutdown();
                }
                preDestroyMonitor.close();
            }
            catch ( Exception e )
            {
                log.error("While stopping instances", e);
            }
            finally
            {
                objectStates.clear();
                preDestroyActionCache.clear();
            }
        }
    }