我有一个 Ubuntu Server 10.10 64位，它在 Sun的JVM 上的 Jetty 6.1.24-6 上运行了Web应用程序来自标准Ubuntu存储库.
I have a Ubuntu Server 10.10 64-bit running a web application on Jetty 6.1.24-6 on Sun's JVM, both installed from standard Ubuntu repositories.
我正在尝试查找此服务器的问题(一段时间后100％cpu，这可能与NIO的Selector上的一个已知错误有关，尽管看起来好像将连接器更改为旧io SocketConnector并没有解决问题！)，并且需要进行线程转储.
I'm trying to track down a problem with this server (100% cpu after some time, it might be related to a known bug on NIO's Selector, although it looks like changing the connector to old io SocketConnector didn't solve the problem!), and need to take a thread dump.
不幸的是，我无法获取线程转储.我尝试向该过程发送 SIGQUIT ，并尝试将 JStack 附加到该过程，但是两种方法均无效.
Unfortunately I'm unable to get the thread dump. I've tried to send a SIGQUIT to the process, and tried to attach JStack to it, but neither approach works.
我从SIGQUIT(在Jetty生成的任何日志文件中)根本看不到任何输出，即使以root(或jetty)身份运行并带有"-F"，JStack也表示它已附加到处理，但随后阻塞并不再产生输出！
I see no output at all from SIGQUIT (in any of the log files generated by Jetty), and JStack, even when run as root (or jetty) and with "-F", says that it has been attached to the process, but then blocks and produces no more output!
如何获取线程转储?
推荐答案您必须以正在运行码头程序的同一用户身份执行此操作.在Ubuntu上，此用户通常称为jetty.
You have to do this as the same user as the jetty process is running under. On Ubuntu this user is normally called jetty.
所以尝试
sudo -u jetty jstack <pid>这会将线程转储发送到stdout(您的shell).
this will send a thread dump to stdout (your shell).
您也可以
sudo -u jetty kill -QUIT <pid>这会将线程转储发送到码头的标准输出(通常为/var/log/jetty/out.log)
which will send the thread dump to jetty's stdout (normally /var/log/jetty/out.log)
要获取pid，请使用jps命令或ps ax|grep java
To get the pids use the jps command or ps ax|grep java
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如何获得Jetty线程转储?
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