docs: protected synchronized void shutdown()
                      throws ObjectManagerException
      {
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.entry(this, cclass
                          , "shutDown"
                              );
  
          setState(nextStateForShutdown);
          // Any attempt by any therad to do anything with this Transaction
          // from now on will result in a InvalidStateException.
  
          if (Tracing.isAnyTracingEnabled() && trace.isEntryEnabled())
              trace.exit(this, cclass
                         , "shutdown"
                              );
      }