Enterprise JavaBeans, 3.0

12.1. JMS and Message-Driven Beans All EJB 3.0 vendors must support a JMS provider. Most vendors have a JMS provider built in and must support other JMS providers through the JCA. However, regardless of whether your vendor has its...

12.2. JMS-Based Message-Driven Beans Message-driven beans (MDBs) are stateless, server-side, transaction-aware components for processing asynchronous messages delivered via JMS. While a message-driven bean is responsible for processing messages, i...

12.3. The Life Cycle of a Message-Driven Bean Just as session beans have well-defined life cycles, so does the MDB bean. The MDB instance's life cycle has two states: Does Not Exist and Method-Ready Pool . The Method-Ready Pool is similar t...

12.4. Connector-Based Message-Driven Beans Although the JMS-based MDB has proven very useful, it has limitations. Perhaps the most glaring limitation is that EJB vendors are able to support only a small number of JMS providers ...