Detailed Instructions: You are given a passage. You need to construct a question about the information present in the passage. Construct a question in such a way that (i) it is unambiguous, (ii) its answer is the whole paragraph. Avoid creating questions that can be answered correctly without actually understanding the paragraph.
Q: Entity is used for storage access... Statefull / Stateless Sessions contain / execute a activity or business process..
MDBs handle inbound messages...

Example: JMS message is sent from a Web Server application requesting account details for a user from the backend host, a MDB is triggered on the inbound traffic, MDB calls up the Session EJB Customer account details service, Session calls a collection of security / role access, web services, jdbc and / or entity beans to grab the data, MDB mediates the reply and responds to the reply queue.

In my souces I've included a link to a book on this subject.
A:
can anyone explain what are Entity,Session and Message Driven beans in Ejb with a simple example ?