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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 - User data can be saved to database via entity beans.
B - User data can be retrived from the database in the entity bean.
Answer : D
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 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.
C - It describes the properties of persistence mechanism.
D - It describes the data-store related properties like connection url. user-name,password etc.
Answer : A
Explaination
Entity is a persistent object representing the data-store record. It is good to be serializable.
Q 3 - Which of the following is correct about EntityManager 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 : B
Explaination
EntityManager is an interface to do data operations like add/delete/update/find on persistent object. It also helps to execute queries using Query interface.
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 properties required for a message driven bean?
Answer : A
Explaination
@javax.ejb.ActivationConfigProperty annotation is used to specify properties required for a message driven bean.
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.
Answer : A
Explaination
@PrePersist - method is invoked when an entity is created in database.
Q 7 - Which annotation is used to inject an ejb into another ejb?
Answer : A
Explaination
@EJB annotation is used to inject other EJB reference.
Q 8 - Which of the following is correct about a Durable 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 : D
Explaination
Durable - 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?
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 exceptions handling by EJB Container?
B - EJB Container wraps the exception into RemoteException and throws it to the client.
Answer : C
Explaination
When System Exception occurs, ejb container intercepts the exception, rollbacks the transaction and start the clean up tasks. It wraps the exception into RemoteException and throws it to the client.
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