#vulnerable code 
                              @Override
  public String toString() {
    return toStringHelper().toString();
  } 
                            #location 3 
                            #vulnerability type THREAD_SAFETY_VIOLATION
#fixed code
                              @Override
  public String toString() {
    return MoreObjects.toStringHelper(this)
        .add("requestMetadata", requestMetadata)
        .add("temporaryAccess", temporaryAccess).toString();
  }