public boolean isKnownJDKThread() {
    String stackTrace = myStackTrace;
    if (stackTrace == null) {
      return false;
    }
    if (myKnownJDKThread == null) {
      myKnownJDKThread = ThreadDumpParser.isKnownJdkThread(stackTrace);
    }
    return myKnownJDKThread;
  }
public boolean isKnownJDKThread()