EJB Online Quiz

Q 1 - Which of the following is true about session 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 bean is represents persistent data storage?

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 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 - Which of the following is true about @javax.ejb.Remote annotation?

A - @javax.ejb.Remote annotation is used to specify Remote interface(s) of a session bean.

B - This remote interface states the business methods of the session bean (which can be stateless or stateful).

C - This interface is used to expose the business methods to remote clients which are running in different deployment/application as EJB.

D - All of the above.

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

A - Method is invoked before an entity is to be updated in the database.

B - Method is invoked when a record is fetched from database and loaded into the entity.

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 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 NOT_SUPPORTED 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 exceptions handling by EJB Container?

A - When System Exception occurs, ejb container intercepts the exception, rollbacks the transaction and start the clean up tasks.

B - EJB Container wraps the exception into RemoteException and throws it to the client.

C - Both of the above

D - None of the above.