docs: @Override
      public Object getJMSXGroupSeq() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.entry(this, tc, "getJMSXGroupSeq");
          Object result = null;
  
          if (mayHaveMappedJmsSystemProperties()) {
              result = getObjectProperty(SIProperties.JMSXGroupSeq);
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              SibTr.exit(this, tc, "getJMSXGroupSeq", result);
          return result;
      }