jstack是一个可以返回在应用程序上运行的各种各样线程的一个完整转储的实用程序，您可以使用它查明问题。
Jstack is a utility that returns a complete dump of the various threads running in an app, which you can then use to pinpoint the problem.
这是开销最大、但也是最完整的转储方式。
This is the most expensive dump, but also the most complete.
fullcore — 启用/禁用完整的核心转储
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