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What is the difference between Message Driven Beans and Stateless Session beans?
In several ways, the dynamic creation and allocation of message-driven bean instances mimics the behavior of stateless session EJB instances, which exist only for the duration of a particular method call. However, message-driven beans are different from stateless session EJBs (and other types of EJBs) in several significant ways:
- Message-driven beans process multiple JMS messages asynchronously, rather than processing a serialized sequence of method calls.
- Message-driven beans have no home or remote interface, and therefore cannot be directly accessed by internal or external clients. Clients interact with message-driven beans only indirectly, by sending a message to a JMS Queue or Topic.
- Only the container directly interacts with a message-driven bean by creating bean instances and passing JMS messages to those instances as necessary.
The Container maintains the entire lifecycle of a message-driven bean; instances cannot be created or removed as a result of client requests or other API calls.
Do not see interviews as the chance
Do not see interviews as the chance, think it as an opportunity to present you to a company. It is a chance for you to prove yourself in front of the interviewer, so you should come with full preparation of questions you need answers...
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