March 2, 2004

he Chain of Responsibility (COR) pattern is a behavioral pattern for decoupling requests from request handlers. It transparently routes requests to the appropriate handler and can (depending on the dispatching semantics) give multiple handlers an opportunity to handle the request. New handlers may be quickly and easily added to provide

wo major limitations in the Enterprise JavaBeans (EJB) specification make it difficult to develop multi-threaded EJB applications: New user threads cannot be created inside EJB Container. EJB methods cannot be called asynchronously. These restrictions make it difficult to develop concurrent applications with EJB. Luckily, by utilizing JMS along with EJB