1. 发送信号
* In Unix, use "kill -3 <pid>" where pid is the Process ID of the JVM.（kill 信号列表）
* In Windows, press CTRL+BREAK on the window where the JVM is running.
2. jstack -l pid.
http://blog.csdn.net/wanyanxgf/article/details/6944987
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原文：http://my.oschina.net/itwangxinli/blog/298289