Enterprise JavaBeans

JMS and Message-Driven Bean

• The most visible difference between message-driven beans and session and entity beans is that clients do not access message-driven beans through interfaces. Unlike a session or entity bean, a message-driven bean has only a bean class.
• Session and entity beans are RPC-based components, while message-driven beans are based on messaging systems.

Why Message-Driven Beans ?

Session beans and entity beans allow you to send JMS messages and to receive them synchronously, but not asynchronously. To avoid tying up server resources, you may prefer not to use blocking synchronous receives in a server-side component. To receive messages asynchronously, use a message-driven bean.