From the user point of view - creating a producer for a third-party class is always risky (and it's not only about final methods, consider for example passivation scopes). For now there are two workarounds for JDK's HashMap/ConcurrentHashMap and similar use-cases:

allow proxying of classes with non-private final methods -------------------------------------------------------- Key: CDI-527 URL: https://issues.jboss.org/browse/CDI-527 Project: CDI Specification Issues Issue Type: Feature Request Components: Beans Affects Versions: 1.2.Final Reporter: Mark Struberg Assignee: Mark Struberg Fix For: 2.0 (proposed) Currently we explicitly disallow proxying of classes with non-private final methods. EJB _does_ allow this. And there are a few final methods in the JDK and other libs. E.g. HashMap#initHashSeedAsNeeded. Currently we cannot have a producer method for it. We might rethink our decision and allow it. Probably with an own annotation like @AllowProxying which disables this check for certain cases (subclass managed-beans or producers).