https://issues.apache.org/bugzilla/show_bug.cgi?id=56387
--- Comment #4 from qiubo...@qq.com ---
Thanks your advice, Konstantin.
Some libraries not only run in tomcat,it can be used in standalone application,
shutdown hook is a ideal place to close external resources.I think tomcat must
be throw a reasonable exception such as IllegalStateException("tomcat has been
stopped.") to hint users to handle their misusage.
Add volatile keyword to org.apache.catalina.loader.WebappClassLoader#started
can help us to find problem quickly.
(In reply to Konstantin Kolinko from comment #3)
> It is your responsibility to stop any threads that a web application may
> have started. Especially, an application (and libraries that it uses) must
> not register any shutdown hooks.
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