code: public static ExtendedTransactionManager getClientTransactionManager() {
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              Tr.entry(tc, "getClientTransactionManager");
  
          if (_tranManager == null) {
              loadEmbeddableTranManager(clientTMKey);
          }
  
          if (TraceComponent.isAnyTracingEnabled() && tc.isEntryEnabled())
              Tr.exit(tc, "getClientTransactionManager", _tranManager);
          return _tranManager;
      }
docs: Must only be called in a client
  
  @return