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https://issues.apache.org/jira/browse/KARAF-7773?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17777608#comment-17777608
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Grzegorz Grzybek edited comment on KARAF-7773 at 10/20/23 7:41 AM:
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Reusing the instance of PaxWebStandardContextHandler is by design. But I get
the picture now. I can't check this today, but soon I'll verify this scenario
with WAB having one listener and not being removed when touched/updated.
And thanks [~amichai] for your investigation - really appreciated!
was (Author: gzres):
Reusing the instance of PaxWebStandardContextHandler is by design. But I get
the picture now. I can't check this today, but soon I'll verify this scenario
with WAB having one listener and not being removed when touched/updated.
> WAB ServletContextListener.contextInitialized invoked multiple times during
> re-deploy (and with wrong context)
> --------------------------------------------------------------------------------------------------------------
>
> Key: KARAF-7773
> URL: https://issues.apache.org/jira/browse/KARAF-7773
> Project: Karaf
> Issue Type: Bug
> Components: karaf
> Affects Versions: 4.4.3
> Reporter: Amichai Rothman
> Assignee: Grzegorz Grzybek
> Priority: Major
> Attachments: paxweb.log, paxweb.trace.log, paxweb.trace2.log
>
>
> When touching a WAB bundle with a context listener as described belower, the
> undeploy/deploy cycle, instead of just invoking destroy on the old context
> and initialize on the new one, seems to destroy the old one, re-initialize
> the old one (with the wrong "whiteboard extender" context), destroy it again,
> initialize the new one (with correct context), and initialize the old one
> once more (but without the filter init).
> I'll describe my full scenario, even though it's possible the issue can be
> reproduced with a simpler setup:
> I have an application consisting of multiple bundles in the karaf deploy
> folder. One of them is a WAB. It's web.xml only contains display-name and
> listener-class with a ServletContextListener. The listener contextInitialized
> implementation instantiates a custom Filter, whose class is imported from a
> different app bundle:
> {code:java}
> Filter filter = new MyFilter();
> context.addFilter("MyFilter", filter)
> .addMappingForUrlPatterns(EnumSet.of(DispatcherType.REQUEST,
> DispatcherType.FORWARD), true, "/*");
> {code}
> The filter's init method is invoked successfully and all is good.
> Then, I update/touch the WAB bundle in the deploy folder.
> This causes a thread named "paxweb-config-3-thread-1 (undeploy /)" to call
> the listener's contextDestroyed method as expected, but then it also
> immediately calls the contextInitialized method again (still from the
> undeploy thread, and still the same old listener instance), this time with
> the servlet context of the pax-web-extender-whiteboard rather than the WAB
> bundle. It creates another filter instance, whose init method gets invoked
> with the pax-web-extender-whiteboard context as well (my init implementation
> throws an exception at this point when the context is wrong, resources aren't
> found etc.).
> Then a thread named "paxweb-config-3-thread-1 (deploy /)" (notice undeploy
> changed to deploy) calls contextDestroyed, still with the extender context.
> Finally, a new listener instance is craeted, contextInitialized is invoked
> again, this time with the correct WAB context, followed by the filter's init
> method. In addition, the old listener instance (which should be dead by now)
> contextInitialized also gets invoked again, but not followed by the filter
> init (maybe because it previously threw an exception on it? just guessing).
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