docs: public void startMessagingEngine(String busName, String name)
                      throws Exception {
  
          String thisMethodName = CLASS_NAME
                                  + ".startMessagingEngine(String, String)";
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              SibTr.entry(tc, thisMethodName, new Object[] { busName, name });
          }
  
          BaseMessagingEngineImpl me = (BaseMessagingEngineImpl) getMessagingEngine(
                                                                                    busName, name);
          if (me != null) {
              me.startConditional();
          } else {
              if (TraceComponent.isAnyTracingEnabled() && tc.isDebugEnabled())
                  SibTr.debug(tc, "Unable to locate engine <bus=" + busName
                                  + " name=" + name + ">");
              throw new Exception("The messaging engine <bus=" + busName
                                  + " name=" + name + "> does not exist");
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled()) {
              SibTr.exit(tc, thisMethodName);
          }
      }