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 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 description 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 stateful session bean?

A - @javax.ejb.Stateless

B - @javax.ejb.Stateful

C - @javax.ejb.MessageDrivenBean

D - @javax.ejb.EJB

Q 5 - Which of the following is true about @javax.ejb.Local annotation?

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

B - This local 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 local clients which are running in same deployment/application as EJB.

D - All of the above.

Q 6 - Which of the following is correct about @PreDestroy 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 of the following is correct about timer service in EJB?

A - Timer Service is a mechanism using which scheduled application can be build.

B - EJB Timer Service is a service provided by Ejb container which helps to create timer and to schedule callback when timer expires.

C - Both of the above.

D - None of the above.

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

A - byte[]

B - String

C - Serializable Object

D - All of the above.

Q 9 - Which of the following is correct about a Failed 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.