Transaction must be sticky to ensure consistency for EJB remote invocation with JPA ----------------------------------------------------------------------------------- Key: WFLY-4333 URL: https://issues.jboss.org/browse/WFLY-4333 Project: WildFly Issue Type: Bug Components: EJB Reporter: Wolf-Dieter Fink Assignee: Tomasz Adamski Priority: Critical Labels: ejb, transaction Fix For: 11.0.0.Final If an application inside of a server uses standard JavaEE persistence JPA, the current implementation include a local 1. level cache which might end in inconsistent reads within the same (uncommited) transaction. There are two reasons - JPA must not flush changes to an entity until commit - The 1. level cache might not read from the persistence if the entity is already loaded in a transaction Therefore the server to server invocations of EJB's need to be sticky to one node during a transaction. The granularity must be the application. It might be worth to use already known nodes for other applications as well. The stickyness should be enabled automatically if a transaction is active and distributed, which is the default within the current implementation, and use the loadbalancing policy if no transaction is active.