code: @Override
      public void registerCallback(UOWScopeCallback callback) {
          if (tc.isEntryEnabled())
              Tr.entry(tc, "registerCallback", callback);
  
          UserTransactionImpl.instance().registerCallback(callback);
  
          if (tc.isEntryEnabled())
              Tr.exit(tc, "registerCallback");
      }
docs: UOWScopeCallbackAgent interface