#vulnerable code 
                              public IBigtableDataClient getClientWrapper() {
    if (options.useGCJClient()) {
      if (this.dataGCJClient == null) {
        synchronized (BigtableSession.this) {
          try {
            if (dataGCJClient == null) {
              BigtableDataSettings dataSettings =
                  BigtableVeneerSettingsFactory.createBigtableDataSettings(options);
              this.dataGCJClient = new BigtableDataGCJClient(
                  com.google.cloud.bigtable.data.v2.BigtableDataClient.create(dataSettings));
            }
          } catch (IOException ioException) {
            throw new RuntimeException(ioException);
          }
        }
      }
      return dataGCJClient;
    } else {
      return new BigtableDataClientWrapper(dataClient, getDataRequestContext());
    }
  } 
                            #location 17 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                              public IBigtableDataClient getClientWrapper() {
    if (options.useGCJClient()) {
      return dataGCJClient;
    } else {
      return new BigtableDataClientWrapper(dataClient, getDataRequestContext());
    }
  }