code: public void initialize()
      {
          final boolean isTraceOn = TraceComponent.isAnyTracingEnabled();
          if (isTraceOn && tc.isEntryEnabled())
              Tr.entry(tc, "initialize");
  
          ivCallBackHandler = new JPAUserTxCallBackHandler(this);
  
          // add JPA component instance to the component accessor
          JPAAccessor.setJPAComponent(this); // d416151.3.5
  
          if (isTraceOn && tc.isEntryEnabled())
              Tr.exit(tc, "initialize");
      }
docs: d515803