What Are Message-Driven Beans?
Prior to the EJB 2.0 Specification, most JMS message consumers were built as simple Java programs that ran outside the container. There was typically a Java program that was started, and that would connect to a JMS destination and listen for incoming messages. Due to the restrictions placed on enterprise beans and non-EJB classes with respect to creating threads, there was no easy way to build an asynchronous JMS consumer inside the container. Although many EJB vendors provided services for startup classes and additional thread management capabilities, this was all proprietary to that vendor. For these reasons, external Java programs were used most often as consumers of JMS messages.
Although that approach to building ...
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