Re: [seam-dev] [weld-dev] startup beans

On Wed, Oct 20, 2010 at 12:41 PM, Denis Forveille <denis.forveille(a)gmail.com I've seen questions about whether a singleton is in fact a unique member in a cluster. Since the Java EE spec doesn't specifically address clustering (right?), this requirement is open for loose interpretation. In fact, section 4.8 of the EJB 3.1 spec even suggests that this is not a guarantee: *A Singleton session bean is a session bean component that is instantiated once per application. In cases **where the container is distributed over many virtual machines, each application will have one bean **instance of the Singleton for each JVM.* I would definitely agree with you there. The CDI tutorial in the Weld reference guide makes mention of a theoretical @ClusterScoped which would be a more apt choice. And that's precisely the type of solution we want to provide in Seam 3 so that duplication of effort for such custom solutions can be avoided. We certainly welcome your review, feedback or contribution in tackling this scope. Given that singleton session beans aren't likely unique in a cluster, then we really need to get serious about offering a cluster-scoped annotation. Pete, JIRA? -Dan -- Dan Allen Principal Software Engineer, Red Hat | Author of Seam in Action Registered Linux User #231597 http://mojavelinux.com http://mojavelinux.com/seaminaction http://www.google.com/profiles/dan.j.allen