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

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().


> 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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