OutOfMemoryError due to large session counts in heap with ATG on EAP 7

Solution Verified - Updated

Environment

  • JBoss Enterprise Application Platform (EAP) 7.x
  • ATG 11.3

Issue

  • When running on ATG on EAP 7, we started seeing OutOfMemoryErrors. Heap dumps show the heap is being consumed by large amounts of sessions that are retained within the atg.multisite.session.MultisiteComponentSessionManager's mSessions HashTable.

Resolution

  • Contact Oracle for an available patch (reference patch: 27507725 - HTTP Session leak with JBoss 7.0 after JBoss invalidates the session)

Root Cause

  • EAP 7 made a change in the way Sessions are tracked where they now use a org.wildfly.clustering.web.session.ImmutableSession, which fails ATG's internal validation of the session. Hence, when an unbound is issued the ATG code does not unbind its thread variables from the session which leads to a Session Leak.
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