This is very odd. I ran Tomcat with -verbose:class (see relevant output
below). The class is being loaded twice from the same location, I'm
guessing by two different class loaders. How can that be?
[Loaded org.redisson.tomcat.RedissonSessionManager from
file:/C:/dev/tomcat.9.0.19/lib/redisson-tomcat-9-3.12.2.jar]
[Loaded org.redisson.tomcat.RedissonSessionManager$2 from
file:/C:/dev/tomcat.9.0.19/lib/redisson-tomcat-9-3.12.2.jar]
On Fri, May 8, 2020 at 11:04 AM Olaf Kock <tom...@olafkock.de> wrote:
>
> On 08.05.20 09:37, Jonathan Yom-Tov wrote:
> > Thanks Mark. Just tried that. I put the redisson-tomcat jar outside of
> > WEB-INF/lib and added it with scope provided. I get the exact same issue.
> > What am I doing wrong?
>
> Make sure, it's actually gone from your webapp. Depending on the
> deployment technique I've seen removed files to persist from previous
> deployments.
>
> You might need to fully undeploy, then deploy the new version without
> the jar in question. But inspect the runtime environment to make sure
> you only have a single library accessible. Having the same class
> available two different ways is a recipe for disaster, don't fix it my
> messing with the classloader: Fix it by eliminating one of them.
>
> You might also check if you're not accessing any wrapped object, e.g. by
> inspecting getManager(session).getClass().getName().
>
> Olaf
>
>
>
> > Here's my code:
> >
> > HttpSession session = httpServletRequest.getSession(false);
> > try {
> > RedissonSessionManager rsm = (RedissonSessionManager)
> getManager(session);
> > } catch (Exception e) {
> > e.printStackTrace();
> > }
> >
> > private Manager getManager(HttpSession session) throws Exception {
> >
> > Field facadeSessionField =
> > StandardSessionFacade.class.getDeclaredField("session");
> > facadeSessionField.setAccessible(true);
> > StandardSession stdSession = (StandardSession)
> > facadeSessionField.get(session);
> >
> > return stdSession.getManager();
> > }
> >
> >
> >
> > On Thu, May 7, 2020 at 11:52 PM Mark Thomas <ma...@apache.org> wrote:
> >
> >> On 07/05/2020 21:36, Jonathan Yom-Tov wrote:
> >>> My application uses Redisson (a client which persists the session to
> >>> Redis). There are two Redisson jar files located in $CATALINA_HOME/lib,
> >> so
> >>> if I understand the docs correctly they're loaded by the common class
> >>> loader.
> >>>
> >>> I want to access the RedissonSessionManager class during a request. The
> >>> problem is that if I do something like RedissonSessionManager manager =
> >>> (RedissonSessionManager) session.getManager() I get a
> ClassCastException,
> >>> presumably because they were loaded by different class loaders.
> >>>
> >>> Will it help if I somehow access the common class loader for this? If
> so
> >>> how can I do that? If not is there some other way I can achieve this?
> >> Make sure you don't have those JARs in your application's WEB-INF/lib as
> >> well as $CATALINA_BASE/lib.
> >>
> >> In any recent version of Tomcat any JAR in $CATALINA_BASE/lib will be
> >> visible to your application.
> >>
> >> Mark
> >>
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> >>
> >>
>
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>
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