EJB Online Quiz

Q 1 - Which of the following is true about message driven bean?

A - Message driven bean is a stateless bean.

B - This is a type of enterprise bean which is invoked by EJB container when it receives a message from queue or topic.

C - Message driven bean is used to do task asynchronously.

D - All of the above.

Q 2 - Which of the following is true about stateful bean?

A - EJB Container creates a separate stateful session bean to process client's each request.

B - As soon as request scope is over, statelful session bean is destroyed.

C - Both of the above.

D - None of the above.

Q 3 - Which of the following is correct about mappedName attribute in @javax.ejb.Stateless annotation?

A - It is used to specify name of the session bean.

B - it is used to specify the JNDI name of the session bean.

C - It is used to provide description of the session bean.

D - None of the above.

Q 4 - Which of the following annotation is used to specify that a given ejb class is a message driven bean?

A - @javax.ejb.Stateless

B - @javax.ejb.Stateful

C - @javax.ejb.MessageDrivenBean

D - @javax.ejb.EJB

Q 5 - Which of the following annotation is used to specify Remote interface(s) of a session bean?

A - @javax.ejb.Stateless

B - @javax.ejb.Stateful

C - @javax.ejb.Remote

D - @javax.ejb.EJB

Q 6 - Which of the following is correct about @PostConstruct annotation for a callback method?

A - Method is invoked when a bean is created for the first time.

B - Method is invoked when a bean is removed from the bean pool or is destroyed.

C - Method is invoked when a bean is loaded to be used.

D - Method is invoked when a bean is put back to bean pool.

Q 7 - Which annotation is used to inject singleton services like timer service into an ejb?

A - @EJB

B - @Resource

C - Both of the above.

D - None of the above.

Q 8 - Which of the following is correct about a Durable transaction in EJB?

A - If any of work item fails, the complete unit is considered failed. Success meant all items executes successfully.

B - A transaction must keep the system in consistent state.

C - Each transaction executes independent of any other transaction.

D - Transaction should survive system failure if it has been executed or committed.

Q 9 - Which of the following is correct about a Start attrribute of Bean Managed Transactions in EJB?

A - When to start a transaction in a business method.

B - Identify success scenario when a transaction is to be committed.

C - Identify failure scenario when a transaction is to be rollback.

D - None of the above.

Q 10 - Which of the following is correct about a RolesAllowed attrribute of Container Managed Transactions in EJB?

A - Indicates that class will accept those declared roles. Annotations are applied at class level.

B - Indicates that a method can be accessed by user of role specified. Can be applied at class level resulting which all methods of class can be accessed buy user of role specified.

C - Indicates that business method is accessible to all. Can be applied at class as well as at method level.

D - Indicates that business method is not accessible to any of user specified at class or at method level.