The EJB roadmap includes the integration of JMS (Java Message Service)
and EJB. This integration will provide support for message driven EJBs
(i.e. EJBs that are JMS message listeners (which are JMS async consumers
of messages)) and EJBs which produce JMS messages.
This will allow a unit of work to be composed of multiple, asynchronous
transactions that are connected via reliable messages. Messages can be
thought of as business events, work flow units, etc.
This architecture allows a container to handle the plumbing of
messaging, threading, transactions, etc while EJBs provide the business
logic. This provides a high level way of handling asynchronous
processing without introducing complicated daemon and threading concepts
into the EJB component model.
A preview of this approach is described in the Application Server
chapter of the JMS spec, http://java.sun.com/products/jms.
-- Mark
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