~business code (simplified):
public void myBusiness(AsyncResponse wrapperOfAsyncContext) {
new Thread() {
@Override
public void run() {
wrapperOfAsyncContext.synchronizedDispatch();
}
}.start();
wrapperOfAsyncContext.synchronizedMethod();
}
If timing is good (and encountered enough to say it is in real life) then
both method call will lock cause:
1. for the user thread: the dispatch call will call pauseNonContainerThread
to wait the myBusiness thread to end (actually a bit more but you get the
idea)
2. synchronizedMethod will lock on synchronizedDispatch
so synchronizedMethod is lock on synchronizedDispatch which is lock on
the pauseNonContainerThread of the caller/http thread so both threads are
locked.
Romain Manni-Bucau
@rmannibucau <https://twitter.com/rmannibucau> | Blog
<https://blog-rmannibucau.rhcloud.com> | Old Wordpress Blog
<http://rmannibucau.wordpress.com> | Github <https://github.com/rmannibucau> |
LinkedIn <https://www.linkedin.com/in/rmannibucau> | Tomitriber
<http://www.tomitribe.com> | JavaEE Factory
<https://javaeefactory-rmannibucau.rhcloud.com>
2016-09-02 16:33 GMT+02:00 Mark Thomas <[email protected]>:
> On 02/09/2016 14:45, Romain Manni-Bucau wrote:
> > PS: this pauseNonContainerThread breaks CXF apps cause they synchronize
> an
> > instance (AsyncResponseImpl) which potentially deadlock with tomcat cause
> > of that. Would be nice to solve it in a manner not requiring all
> apps/libs
> > to know that.
>
> Can you provide more details of what is going on in this case? I can see
> potential ways for this to break but the app has to do some pretty odd
> things to make that possible.
>
> Mark
>
> > Romain Manni-Bucau
> > @rmannibucau <https://twitter.com/rmannibucau> | Blog
> > <https://blog-rmannibucau.rhcloud.com> | Old Wordpress Blog
> > <http://rmannibucau.wordpress.com> | Github <https://github.com/
> rmannibucau> |
> > LinkedIn <https://www.linkedin.com/in/rmannibucau> | Tomitriber
> > <http://www.tomitribe.com> | JavaEE Factory
> > <https://javaeefactory-rmannibucau.rhcloud.com>
> >
> > 2016-08-17 15:55 GMT+02:00 Romain Manni-Bucau <[email protected]>:
> >
> >> Hi guys,
> >>
> >> I got several cases in prod where pauseNonContainerThread() get stucked
> >> (ie the thread is blocked but no other thread is actually working and
> can
> >> release it).
> >>
> >> I'm not really sure of the cause - I suspect some timeouts but can't
> >> guarantee it. Just for information I'm using JAX-RS 2 @Suspended with
> CXF
> >> which is built on top of Servlet 3 AsyncContext.
> >>
> >> Question is: can tomcat kind of enforce it to be released either using a
> >> configurable timeout for this wait or something equivalent to avoid
> such a
> >> case? Goal is to avoid as much as possible to fully lock the container
> in
> >> the caller doesn't handle properly the async usage (hypothesis being
> tomcat
> >> doesn't have a bug on that area).
> >>
> >>
> >> Romain Manni-Bucau
> >> @rmannibucau <https://twitter.com/rmannibucau> | Blog
> >> <https://blog-rmannibucau.rhcloud.com> | Old Wordpress Blog
> >> <http://rmannibucau.wordpress.com> | Github
> >> <https://github.com/rmannibucau> | LinkedIn
> >> <https://www.linkedin.com/in/rmannibucau> | Tomitriber
> >> <http://www.tomitribe.com> | JavaEE Factory
> >> <https://javaeefactory-rmannibucau.rhcloud.com>
> >>
> >
>
>
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