Posted in: EJB Interview Questions with Answers
public interface javax.ejb.SessionBean extends javax.ejb.EnterpriseBean{
public abstract void ejbActivate();
public abstract void ejbCreate();
public abstract void ejbPassivate();
public abstract void ejbRemove();
public abstract void setSessionContext(SessionContext ctx);
}
- SessionContext a S.C is your beans gateway to interact with the container, S.C query the container about your current transactional state, your security state.
- The ejbCreate() methods is part of the bean's lifecycle, so, the compiler will not return an error because there is no ejbCreate() method.
- ejbPassivate( ) a If too many beans are instantiated, the container can passivate some of them .ie write the bean to some temp storage. The container should release all resources held by the bean. Just before passivating, the container calls the ejbPassivate() method. So release all resources here, i.e. close socket connections..etc.
- ejbActivate( ) a When a passiavted bean is called, its said to be activated. The container then calls the ejbActivate() method. Acquire all the required resources for the bean in this method. ie get socket connection
- ejbRemove() a container wants to remove your bean instance it will call this method.