EJB Online Quiz

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

A - This type of bean stores data of a particular user for a single session.

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

C - This type of bean represents persistent data storage.

D - None of the above.

Q 2 - Which of the following is correct about Entity in EJB persistence API?

A - It is a persistent object representing the data-store record. It is good to be serializable.

B - it is an interface to do data operations like add/delete/update/find on persistent object. It also helps to execute queries using Query interface.

C - It describes the properties of persistence mechanism.

D - It describes the data-store related properties like connection url. user-name,password etc.

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

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

B - it is used to specify message listener interface for the message driven bean.

C - It is used to specify the configuration details of the message-driven bean in operational environment of the message driven bean.

D - It is used to specify the JNDI name of the message driven bean.

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

A - @javax.ejb.Stateless

B - @javax.ejb.Stateful

C - @javax.ejb.MessageDrivenBean

D - @javax.ejb.EJB

Q 5 - @javax.ejb.Local annotation is used to specify Local interface(s) of a session bean.

A - true

B - false

Q 6 - Which of the following is correct about @PrePassivate 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 Consistent 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 REQUIRES_NEW attrribute of Container Managed Transactions in EJB?

A - Indicates that business method has to be executed within transaction otherwise a new transaction will be started for that method.

B - Indicates that a new transaction is to be started for the business method.

C - Indicates that business method will execute as part of transaction.

D - Indicates that business method should not be executed as part of transaction.

Q 10 - Which of the following is true about Application level exception in EJB?

A - If business rule is voilated or exception occurs while executing the business logic will be treated as application level exception.

B - Any exception which is not caused by business logic or business code. RuntimeException, RemoteException are SystemException will be treated as application level exception.

C - It is quite similar to HQL, hibernate query language.

D - All of the above.