What is the life cycle of MDB - The lifetime of an MDB instance is controlled by the container. Only two states exist: Does not exist and Ready , as illustrated in the following figure: The life of an MDB instance starts when the container invokes newInstance() on the MDB class to create a new instance. Next, the container calls setMessageDrivenContext() followed by ejbCreate() on the instance. The bean then enters the Ready state and is ready to consume messages. When a message arrives for the bean, the container invokes the onMessage() method of one of the available instances, passing a Message object in argument. Message s can be consumed and processed concurrently by using multiple instances of the same type. The container invokes ejbRemove() on the bean instance when it no longer needs the instance. The bean instance can perform clean up operations here.

Our Services

Get 9,000 Interview Questions & Answers in an eBook.

Get it now !!

Search Interview Questions

Question: What is the life cycle of MDB

Answer: The lifetime of an MDB instance is controlled by the container. Only two states exist: Does not exist and Ready , as illustrated in the following figure:

The life of an MDB instance starts when the container invokes newInstance() on the MDB class to create a new instance. Next, the container calls setMessageDrivenContext() followed by ejbCreate() on the instance. The bean then enters the Ready state and is ready to consume messages.

When a message arrives for the bean, the container invokes the onMessage() method of one of the available instances, passing a Message object in argument. Message s can be consumed and processed concurrently by using multiple instances of the same type.

The container invokes ejbRemove() on the bean instance when it no longer needs the instance. The bean instance can perform clean up operations here.

Category	EJB Interview Questions & Answers - Exam Mode / Learning Mode
Rating	(0.3) By 2947 users
Added on	7/14/2011
Views	26078
Rate it!

Question: What is the life cycle of MDB

Answer:

The lifetime of an MDB instance is controlled by the container. Only two states exist: Does not exist and Ready , as illustrated in the following figure:

The life of an MDB instance starts when the container invokes newInstance() on the MDB class to create a new instance. Next, the container calls setMessageDrivenContext() followed by ejbCreate() on the instance. The bean then enters the Ready state and is ready to consume messages.

When a message arrives for the bean, the container invokes the onMessage() method of one of the available instances, passing a Message object in argument. Message s can be consumed and processed concurrently by using multiple instances of the same type.

The container invokes ejbRemove() on the bean instance when it no longer needs the instance. The bean instance can perform clean up operations here.
Source: CoolInterview.com

If you have the better answer, then send it to us. We will display your answer after the approval

Rules to Post Answers in CoolInterview.com:-

There should not be any Spelling Mistakes.
There should not be any Gramatical Errors.
Answers must not contain any bad words.
Answers should not be the repeat of same answer, already approved.
Answer should be complete in itself.

	Related Questions	View Answer
	What is lazy loading	View Answer
	What is the difference between JNDI context, Initial context, session context and ejb context	View Answer
	What is the difference between sessioncontext and entitycontext	View Answer
	What is CMR	View Answer
	What is the difference between CMP 1.1 and CMP 2.0	View Answer
	With EJB 1.1 specs, why is unsetSessionContext() not provided in Session Beans, like unsetEntityContext()	View Answer
	What is the difference between ejbCreate() and ejbPostCreate()	View Answer
	What is the difference between optimistic locking and pessimistic locking	View Answer
	What are advantages and disadvantages of CMP and BMP	View Answer
	Can undefined primary keys are possible with Entity beans?If so, what type is defined?	View Answer
	Can undefined primary keys are possible with Entity beans?If so, what type is defined?	View Answer
	When two entity beans are said to be identical?Which method is used to compare identical or not?	View Answer
	Is instance pooling necessary for entity beans?	View Answer
	What is Instance pooling?	View Answer
	How can we call cmp?	View Answer
	What is the difference between find and select methods in EJB	View Answer
	What is handle in EJB	View Answer
	What is abstract schema	View Answer
	If i throw a custom ApplicationException from a business method in Entity bean which is participating	View Answer
	What is the difference b/w sendRedirect() and <jsp: forward>?	View Answer

Please Note: We keep on updating better answers to this site. In case you are looking for Jobs, Pls Click Here Vyoms.com - Best Freshers & Experienced Jobs Website.

View All EJB Interview Questions & Answers - Exam Mode / Learning Mode