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 is true about stateless bean?

A - EJB Container normally creates a pool of few stateless bean's objects and use these objects to process client's request.

B - Because of pool, instance variable values are not guaranteed to be same across lookups/method calls.

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 - 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 @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 of the following is correct about Default 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 is correct about a Atomic 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 SUPPORTS 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 JNDI?

A - JNDI stands for Java Naming and Directory Interface.

B - It is a set of API and service interfaces.

C - Java based applications use JNDI for naming and directory services.

D - All of the above.