[jboss-jira] [JBoss JIRA] (WFLY-9541) Storing a LinkedList subclass in the session breaks replication.

[Klaasjan Brand (JIRA)]

Klaasjan Brand created WFLY-9541:
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             Summary: Storing a LinkedList subclass in the session breaks replication.
                 Key: WFLY-9541
                 URL: https://issues.jboss.org/browse/WFLY-9541
             Project: WildFly
          Issue Type: Bug
          Components: Clustering
    Affects Versions: 12.0.0.Alpha1
         Environment: Tested on JDK 1.8.0_152 on OS X 10.12
            Reporter: Klaasjan Brand
            Assignee: Paul Ferraro


Context: trying to get one of our applications to work with Wildfly session replication.
After trying out a build from the Wildfly master branch to test another bug I submitted I noticed another issue which works fine in the Wildfly 11 release.

Our application has a custom LinkedList subclass (MostRecentlyUsedList) which it stores in the session. It also keeps a reference to the subclass since that one has a few extra fields.
When marshalling the session the MostRecentlyUsedList is converted to a LinkedList. When unmarshalling the session this causes an error since the field is of the subclass type.

This behaviour is new in WF 12 and is related to this commit:
https://github.com/wildfly/wildfly/commit/143527f595206c5f2bf037b47c797f052cbe5d2
(fix for the WFLY-9497 issue).





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