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EJB

Submitted by bookman on Wed, 10/28/2009 - 00:46

EJB

What are the different kinds of enterprise beans? - Different kind of enterrise beans are Stateless session bean, Stateful session bean, Entity bean, Message-driven bean.
What is Session Bean? - A session bean is a non-persistent object that implements some business logic running on the server. One way to think of a session object.
What is Entity Bean? - The entity bean is used to represent data in the database. It provides an object-oriented interface to ____.
What are the methods of Entity Bean? - An entity bean consists of 4 groups of methods, create methods.
What is the difference between Container-Managed Persistent (CMP) bean and Bean-Managed Persistent(BMP) ? - Container-managed persistence (CMP) and bean-managed persistence (BMP). With CMP, the container manages the persistence of the entity bean.
What are the callback methods in Entity beans? - Callback methods allows the container to notify the bean of events in its life cycle. The callback methods are defined in the javax.ejb.EntityBean interface.
What is software architecture of EJB? - Session and Entity EJBs consist of 4 and 5 parts respectively, a remote interface.
Can Entity Beans have no create() methods? - Yes. In some cases the data is inserted NOT using Java application,.
What are transaction isolation levels in EJB? - Transaction_read_uncommitted, Transaction_read_committed, Transaction_repeatable_read.

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