Entity bean is persistent object and represents an object view of data stored in permanent storage.
Entity beans can be of two types:
a) CMP (Entity
Bean with Container Managed Persistence)
b) BMP (Entity Bean with Bean Managed Persistence)
In CMP, we do not need to write any SQL related code for adding a new record, editing a record or deleting a record, or querying a table. The EJB server itself automatically manages the creation of the table and appropriate SQL statements.
However, if we want to have complex joining of data from number of tables and then provide persistence, we will have to write our own SQL. Hence, the need for Bean managed Persistence.
1) Message-Driven Beans
Message Driven Bans do not have any interface. They are just a Java class.
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