EJB-0

Q:	What are the different kinds of enterprise beans?
A:	Different kind of enterrise beans are Stateless session bean, Stateful session bean, Entity bean, Message-driven bean...........

Q:	What is Session Bean?
A:	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...........

Q:	What is Entity Bean?
A:	The entity bean is used to represent data in the database. It provides an object-oriented interface to ...........

Q:	What are the methods of Entity Bean?
A:	An entity bean consists of 4 groups of methods, create methods...........

Q:	What is the difference between Container-Managed Persistent (CMP) bean and Bean-Managed Persistent(BMP) ?
A:	Container-managed persistence (CMP) and bean-managed persistence (BMP). With CMP, the container manages the persistence of the entity bean............

Q:	What are the callback methods in Entity beans?
A:	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............

Q:	What is software architecture of EJB?
A:	Session and Entity EJBs consist of 4 and 5 parts respectively, a remote interface...........

Q:	Can Entity Beans have no create() methods?
A:	Yes. In some cases the data is inserted NOT using Java application,...........

Q:	What is bean managed transaction?
A:	If a developer doesn't want a Container to manage transactions, it's possible to implement all database operations manually...........

Q:	What are transaction attributes?
A:	The transaction attribute specifies how the Container must manage transactions for a method when a client invokes the method via the enterprise bean’s home or...........

Q:	What are transaction isolation levels in EJB?
A:	Transaction_read_uncommitted , Transaction_read_committed , Transaction_repeatable_read...........