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From Funian Li <lifun...@gmail.com>
Subject Re: Tomcat websocket server onclose failed( Tomcat 8.5)
Date Sun, 22 Apr 2018 13:49:05 GMT
 Thank you very much for help.

Best regards,
Funian Li


2018-04-18 19:00 GMT+08:00 Mark Thomas <markt@apache.org>:

> On 13/04/18 09:47, Mark Thomas wrote:
> > On 13/04/18 03:13, Funian Li wrote:
> >> 2018-04-12 4:19 GMT+08:00 Mark Thomas <markt@apache.org>:
> >>
> >>> On 11/04/18 09:50, Funian Li wrote:
> >>>>  Dear All,
> >>>>
> >>>>   A problem happen when tomcat websocket server was used.
> >>>
> >>>> Exact Tomcat version?
> >>>
> >>>> If not 8.5.30, does the problem still occur if you upgrade to 8.5.30?
> >>>
> >>>> Mark
> >>>
> >>
> >>  Yes , the exact Tomcat version is 8.5.30, shall i upgrade to tomcat
> 9.0 ?
> >
> > Thanks for the version information.
> >
> > An upgrade to 9.0.x is unlikely to help. The code is almost identical
> > between 8.5.x and 9.0.x.
> >
> > The next step will be to try the test case you provided to see if the
> > problem can be reproduced.
>
> Adding the code to my (resurrected) github project for Tomcat test
> cases[1] and formatting the code made the root cause obvious.
>
> As per the Java WebSocket specification:
> <quote>
> [WSC-5.1-1] In all cases, the implementation must not invoke an
> endpoint instance with more than one thread per peer at a time.
> </quote>
>
> In onMessage() a loop is entered (on the container thread for that peer)
> that can never be exited because the stop message will never be
> processed because that requires a container thread and the only
> container thread allowed is processing the loop.
>
> The fix is to spwan a new thread in onMessage() and use that to write
> the messages.
>
> Mark
>
>
> [1] https://github.com/markt-asf/tomcat-bugs
>
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