EJB Online Quiz

Q 1 - Which of the following is true about entity 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 true about stateless bean?

A - A stateless session bean is a type of enterprise bean which is normally used to do independent operations.

B - A stateless session bean as per its name does not have any associated client state, but it may preserve its instance state.

C - Both of the above.

D - None of the above.

Q 3 - Which of the following is correct about Data Source 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 4 - Which of the following is correct about mappedName attribute in @javax.ejb.EJB annotation?

A - It is used to specify name which will be used to locate the referenced bean in environment.

B - it is used to specify the interface type of the referenced bean.

C - It is used to provide name of the referenced bean.

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

Q 5 - @javax.ejb.PostActivate annotation is used to specify callback method of ejb lifecycle.

A - false

B - true

Q 6 - Which of the following is correct about @PostPersist annotation for a entity bean?

A - Method is invoked when an entity is created in database.

B - Method is invoked after an entity is created in database.

C - Method is invoked when an entity is deleted from the database.

D - Method is invoked after an entity is deleted from the database.

Q 7 - Which annoatation is used to inject SessionContext 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 Isolated 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 Success 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 DenyAll 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.