HttpSession cannot be injected in distributed application --------------------------------------------------------- Key: WFLY-9665 URL: https://issues.jboss.org/browse/WFLY-9665 Project: WildFly Issue Type: Bug Components: CDI / Weld, EE Affects Versions: 10.1.0.Final Reporter: Zoltan Laszlo Ferenci Assignee: Martin Kouba Attachments: HttpSessionInjectionBug.zip The CDI Specification states that HttpSession should be available for injection. It also has statements about when should the bean passivation capable. The problem is that it seems the io.undertow.servlet.spec.HttpSessionImpl is not serializable, and whenever you try to inject, you get exception at passivation. I would say it's normal if it's injected into a passivating scoped bean, because the CDI specification says that the bean is passivation capable only if all it's dependencies is passivation capable. However this is the case even if it's injected in a RequestScoped bean, that shouldn't be passivated. In the sample project only the HttpSession should be passivated that is independent from the CDI. Anyway it gives an error in that case too, and doesn't store and recover the HttpSession.