static L<ThreadInfo> printDeadlocks_monitorsOnly() {
  ThreadMXBean bean = ManagementFactory.getThreadMXBean();
  long ids[] = bean.findMonitorDeadlockedThreads();
  if (empty(ids)) ret emptyList();
  
  printAsciiHeading("DEADLOCKED THREADS!");
  ThreadInfo threadInfo[] = bean.getThreadInfo(ids);
  int i = 0;
  for (ThreadInfo threadInfo1 : threadInfo) {
    print("Thread " + (++i) + "/" + l(threadInfo) + ": ID=" + threadInfo1.getThreadId()
      + ", name=" + quote(threadInfo1.getThreadName()));
    print("  Trying to lock: " + threadInfo1.getLockName()
      + " which is owned by thread " + threadInfo1.getLockOwnerId()
      + " (" + quote(threadInfo1.getLockOwnerName()) + ")");
  }
  print();
  ret asList(threadInfo);
}