docs: public String getTransactionId()
    {
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.entry(tc, "getTransactionId");
      
      String tranID = null;
      PersistentTranId pTranID = itemStream.getTransactionId();
      
      if (pTranID != null)
      {
        tranID = pTranID.toTMString(); 
      }
        
      if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
        SibTr.exit(tc, "getTransactionId", tranID);
      return tranID;
    }