Java Interview Questions

Q) What is EJB Rep) Enterprise JavaBeans. Q) What is EJB container Rep) A container that implements the EJB component contract of the J2EE architecture. This contract specifies a runtime environment for enterprise beans that includes security, concurrency, life-cycle management, transactions, deployment, naming, and other services. An EJB container is provided by an EJB or [...]

To send two values to a stateful session bean and getting their sum and difference. The program makes two conversations(calls) with the session bean. In one call it gets the sum and in the second call it gets the difference. Between the calls state is to be maintained. 1 Step) Remote interface : import javax.ejb.*; [...]

Stateless session bean The stateless session beans life cycle has two states: does not exist state and the method ready pool Does not exist When a bean instance is in the does not exist state, it is not an instance in the momory of the system.In other words, it has not been instantiated yet. The [...]

Development of every bean includes minimum 4 programs. Remote interface Home interface Bean program Client program Remote interface defines all the methods (business methods) used for communication Home interface defines methods used to connect to the bean. Bean program is the implementation program for all themethods of remote and home interfaces. Finally, a client program [...]