9.3. Message-Driven Beans and JDO

A message-driven bean is a server-side message consumer that has, according to the EJB specification[3] the following characteristics:

[3] http://java.sun.com/products/ejb

  • Executes upon receipt of a single client message.

  • Is asynchronously invoked by container on arrival of messages, never called directly by a client.

  • Can be transaction-aware.

  • Is relatively short-lived and is stateless. (A typical EJB container provides a scalable runtime environment to execute a large number of message-driven beans concurrently.)

The EJB 2.0 specification supported only JMS message-driven beans. The EJB 2.1 specification extends the message-driven bean contracts to support other messaging types in addition to JMS.

Transaction demarcation ...

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