Mutations following HttpSession.setAttribute(...) lost on failover when using SESSION granularity distributed web session with a non-transactional cache -------------------------------------------------------------------------------------------------------------------------------------------------------- Key: WFLY-12139 URL: https://issues.jboss.org/browse/WFLY-12139 Project: WildFly Issue Type: Bug Components: Clustering Affects Versions: 16.0.0.Final Reporter: Paul Ferraro Assignee: Paul Ferraro Priority: Critical Consider the following code: AtomicInteger value = new AtomicInteger(1); session.setAttribute("a", value); value.incrementAndGet(); On failover, the value of attribute "a" will still be 1.