[ https://issues.jboss.org/browse/WFLY-9541?page=com.atlassian.jira.plugin.... ] Klaasjan Brand updated WFLY-9541: --------------------------------- Description: 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 LinkedHashMap subclass (MostRecentlyUsedMap) 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 MostRecentlyUsedMap is converted to a LinkedHashMap. 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/143527f595206c5f2bf037b47c797f0... (fix for the WFLY-9497 issue). was: 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/143527f595206c5f2bf037b47c797f0... (fix for the WFLY-9497 issue). Steps to Reproduce: Store a LinkedHashMap subclass in the session and try to do a failover. Expected result is the replicated session is restored an work continues. Actual result is an exception and error page. was: Store a LinkedList subclass in the session and try to do a failover. Expected result is the replicated session is restored an work continues. Actual result is an exception and error page. Summary: Storing a LinkedHashMap subclass in the session breaks replication. (was: Storing a LinkedList subclass in the session breaks replication.) -- This message was sent by Atlassian JIRA (v7.5.0#75005)