code: private int isH2OHTTPRequestThread(StackTraceElement [] elms){
      for(int i = 0; i < elms.length; ++i)
        if(elms[i].getClassName().equals("....JettyHTTPD$H2oDefaultServlet")) //TODO FIXME! No such class(H2oDefaultServlet) exists there now! Use class comparison if another one took the role.
          return i;
      return elms.length;
    }
docs: bruteforce search for H2O Servlet, don't call until other obvious cases were filtered out