EJB Online Quiz

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

A - User data can be saved to database via entity beans.

B - User data can be retrived from the database in the entity bean.

C - This type of bean represents persistent data storage.

D - All of the above.

Q 2 - Which of the following bean is invoked by EJB container when it receives a message from queue or topic?

A - session bean.

B - entity bean.

C - message driven bean.

D - None of the above.

Q 3 - Which of the following is correct about Persistence unit 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 beanInterface 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 - Which of the following annotation is used to specify properties required for a message driven bean?

A - @javax.ejb.ActivationConfigProperty

B - @javax.ejb.Local

C - @javax.ejb.Remote

D - @javax.ejb.EJB

Q 6 - Which of the following is correct about @PrePersist 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 of the following is correct about Class level interceptor in EJB?

A - Such interceptor is invoked for every method of the bean.

B - Such interceptor is invoked for every bean within deployment.

C - Such interceptor is invoked for a particular method of the bean.

D - None of the above.

Q 8 - Which of the following types of java classes can be mapped using @Lob annotation?

A - java.sql.Blob

B - java.sql.Clob

C - Both of the above.

D - None of the above.

Q 9 - Which of the following is correct about a NEVER attrribute of Container Managed Transactions in EJB?

A - Indicates that business method will execute as part of transaction otherwise exception will be thrown.

B - Indicates if business method executes as part of transaction then an exception will be thrown.

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.