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EJB Online Quiz
Following quiz provides Multiple Choice Questions (MCQs) related to EJB Framework. You will have to read all the given answers and click over the correct answer. If you are not sure about the answer then you can check the answer using Show Answer button. You can use Next Quiz button to check new set of questions in the 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.
Answer : C
Explaination
Entity beans represents persistent data storage. User data can be saved to database via entity beans and later on can be retrived from the database in the entity bean.
Q 2 - Which of the following bean is invoked by EJB container when it receives a message from queue or topic?
Answer : C
Explaination
Message driven bean is invoked by EJB container when it receives a message from queue or topic.
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.
C - It describes the properties of persistence mechanism.
D - It describes the data-store related properties like connection url. user-name,password etc.
Answer : C
Explaination
Persistence unit describes the properties of persistence mechanism.
Q 4 - Which of the following is correct about name 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.
Answer : A
Explaination
name attribute in @javax.ejb.EJB annotation is used to specify name which will be used to locate the referenced bean in environment.
Q 5 - Which of the following annotation is used to specify Remote interface(s) of a session bean?
Answer : C
Explaination
@javax.ejb.Remote annotation is used to specify Remote interface(s) of a session bean.
Q 6 - Which of the following is correct about @PostActivate 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.
Answer : C
Explaination
@PostActivate - method is invoked when a bean is loaded to be used.
Q 7 - Which annotation is used to inject an datasource into an ejb?
Answer : B
Explaination
@Resource annotation is used to inject an datasource into an ejb.
Q 8 - Which of the following is correct about a Atomic transaction in EJB?
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.
Answer : A
Explaination
Atomic - If any of work item fails, the complete unit is considered failed. Success meant all items executes successfully.
Q 9 - Which of the following is correct about a SUPPORTS attrribute of Container Managed Transactions in EJB?
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.
Answer : C
Explaination
SUPPORTS - Indicates that business method will execute as part of transaction.
Q 10 - Which of the following is true about System level exception in EJB?
Answer : B
Explaination
Any exception which is not caused by business logic or business code. RuntimeException, RemoteException are SystemException will be treated as system level exception.
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