Question 1

Which of the following is not an implicit object in JSP?
I. Request.
II. Session.
III. Vector.
IV. In.
A) Both (I) and (II) above
B) Both (II) and (III) above
C) Both (I) and (III) above
D) Both (III) and (IV) above.

Accepted Answer

Implicit objects in JSP are predefined objects that provide access to the various objects associated with a page request, session, and the JSP environment itself. Among the options, "Request" and "Session" are indeed implicit objects in JSP, providing access to the request information and user session, respectively. "Vector" and "In" are not implicit objects in JSP; "Vector" is a part of the Java Collections Framework, and "In" does not correspond to any standard implicit object in JSP.

Question 2

Which is not a valid scope for Java bean in JSP?
A) Page
B) Session
C) Request
D) Global.

Accepted Answer

The valid scopes for a JavaBean in JSP are page, request, session, and application. There is no scope called "Global"; instead, the equivalent scope is referred to as "application".

Question 3

Which two of the following is responsible to creates ejb-jar files?
1) The bean provider.
2) The application assembler.
3) The deployer.
4) The system administrator.
A) 1 and 2
B) 2 and 3
C) 3 and 4
D) 4 and 1

Accepted Answer

The bean provider is responsible for creating the enterprise JavaBeans (EJB) components, including their classes and interfaces, and the application assembler combines these components into ejb-jar files for deployment.

Question 4

Which two of the following must be included in every ejb-jar file?
1) Stubs for the EJBHome and EJBObject interface.
2) The JAR Manifest file.
3) A deployment descriptor.
4) The JNDI context.
5) The EJB's home interface.
A) 1 and 3
B) 2 and 5
C) 3 and 5
D) 4 and 2

Accepted Answer

3 and 5 are essential components of an ejb-jar file. The deployment descriptor (ejb-jar.xml) specifies the bean's deployment settings, and the EJB's home interface is necessary for the client to interact with the EJB.

Question 5

Which statement about session beans is true? A) In both stateless and statefull session classes, the bean provider must write the method public void remove() B) The method << remove >> in the component interface can be accessed only by the remote clients C) The bean's handle must be provided by the client, in order to ask the EJBHome for removing a session bean D) None of the above

Accepted Answer

The answer of Which statement about session beans is true?
A)...

Question 6

Which of the following can be directly invoked by the client?
A) ejbPassivate
B) business methods
C) setSessionContext
D) newInstance

Accepted Answer

Business methods in an EJB (Enterprise JavaBeans) are designed to be directly invoked by the client. These methods contain the business logic that clients interact with. Other methods like ejbPassivate, setSessionContext, and newInstance are lifecycle or reflection methods not intended for direct client invocation.

Question 7

Which is the method available in SessionContext interface?
A) afterBegin()
B) getRollbackOnly()
C) setSessionCotext()
D) getUserTransaction()

Accepted Answer

The answer of Which is the method available in SessionContext...

Question 8

Which statements about a session bean class are true?
A) It is a final class
B) Overloaded constructors are supported
C) Their business methods can be 'private'
D) The ejbCreate() method must not be a final method

Accepted Answer

The ejbCreate() method must not be a final method because it needs to be overridden by the container to manage the bean's lifecycle.

Question 9

Upon invoking getRollbackOnly() method by a business method in an entity bean, which transaction attribute settings will lead the ejb container to throw an exception?
A) Required
B) RequiresNew
C) Never
D) Mandatory

Accepted Answer

DThe `getRollbackOnly` method can only be called in the context of a transaction. Thus, it will throw an exception if it is called in a context where no transaction exists. The transaction attributes "Never" (C) and "Mandatory" (D) are relevant here. "Never" specifies that the method must not be called in a transaction context, and "Mandatory" requires an existing transaction. If there's no transaction and `getRollbackOnly` is invoked with "Never", or if it's expected to be in a transaction due to "Mandatory" but isn't, an exception will be thrown.

Question 10

When a session bean has container-managed demarcation value of 'Supports', which three methods run in an unspecified transaction context?
1) ejbActivate
2) getRollbackOnly
3) getUserTransaction
4) ejbRemove
5) afterBegin
6) afterCompletion
A) 1,4,3
B) 4,2,6
C) 1,4,6
D) 2,5,6

Accepted Answer

1) ejbActivate, 4) ejbRemove, and 6) afterCompletion run in an unspecified transaction context because they are lifecycle callback methods or related to transaction completion, not directly involved in business method transaction demarcation.

Question 11

EJB system's performance tuning is the responsibility of
A) Bean Provider
B) EJB Deployer
C) Application Assembler
D) Tool Vendor

Accepted Answer

The EJB Deployer is responsible for deploying EJB applications in the production environment, which includes configuring and tuning the environment for optimal performance. This involves adjusting various settings related to EJB containers, databases, and application server to ensure that the system runs efficiently.

Question 12

The EJB Transaction Attribute that ensures the method call that always takes place in a transaction, either client started or container started' are
A) TX_SUPPORTS
B) TX_MANDATORY
C) TX_REQUIRED and TX_REQUIRES_NEW
D) Either A or B

Accepted Answer

TX_REQUIRED and TX_REQUIRES_NEW ensure that a method call always occurs within a transaction. TX_REQUIRED uses an existing transaction or starts a new one if none exists, while TX_REQUIRES_NEW always starts a new transaction, suspending any existing one.

Question 13

JMS is mainly used to send and receive message from one application to another.
A) True
B) False
C) none
D) all

Accepted Answer

JMS (Java Message Service) is indeed primarily used for sending and receiving messages between two or more applications, allowing for asynchronous communication.

Question 14

Abbreviate the term JMS?
A) Java Message Service
B) Java Monitor Service
C) Java Message Session
D) Java Monitor Session

Accepted Answer

Java Message Service (JMS) is a messaging standard that allows application components based on the Java Enterprise Edition (Java EE) to create, send, receive, and read messages. It enables distributed communication that is loosely coupled, reliable, and asynchronous.

Question 15

A message driven bean is like statefull session bean that encapsulates the business logic and doesn't maintain state.
A) True
B) False
C) none
D) all

Accepted Answer

A message-driven bean does encapsulate business logic similar to a stateful session bean, but it is designed to process messages asynchronously and does not maintain state, distinguishing it from stateful session beans which do maintain state across method calls.

Question 16

EJB QL is a Query Language provided for navigation across a network of enterprise beans and dependent objects defined by means of container managed persistence.
A) True
B) False
C) none
D) all

Accepted Answer

EJB QL (Enterprise JavaBeans Query Language) is indeed a query language designed for navigating across a network of enterprise beans and their related objects, particularly in the context of container-managed persistence.

Question 17

Which case of a session bean obtains the UserTransaction object via the EJBContext using the getUserTransaction() method in EJB transaction management?
A) Bean-managed transactions
B) Container-managed transactions
C) Both A & B
D) None of the above

Accepted Answer

In EJB transaction management, only bean-managed transactions (BMT) allow beans to obtain the UserTransaction object via the EJBContext using the getUserTransaction() method. This enables the bean to programmatically control transaction boundaries. In container-managed transactions (CMT), the container controls the transaction boundaries automatically, and beans are not allowed to manually manage transactions using the UserTransaction object.

Question 18

Which services are provided to EJB components by the EJB container?
A) Transaction support
B) Persistence support
C) Naming support
D) All mentioned above

Accepted Answer

The EJB container provides all mentioned services: transaction support, persistence support, and naming support to EJB components.

Question 19

Which EJB container must provide an implementation of Java Naming and Directory Interface (JNDI) API to provide naming services for EJB clients and components?
A) Transaction support
B) Persistence support
C) Naming support
D) All mentioned above

Accepted Answer

The EJB container must provide an implementation of the Java Naming and Directory Interface (JNDI) API specifically for naming services, which allows EJB clients and components to look up EJBs and other resources.

Question 20

Which session bean maintain their state between client invocations but are not required to maintain their state across server crashes or shutdowns?
A) Stateful Session Bean
B) Stateless Session Bean
C) Singleton Session Bean
D) None of the above

Accepted Answer

The answer of Which session bean maintain their state between...

Quiz 6: JSP, EJB, and JMS

Which of the following is not an implicit object in JSP? I. Request. II. Session. III. Vector. IV. In.

Which is not a valid scope for Java bean in JSP?

Which two of the following is responsible to creates ejb-jar files? 1) The bean provider. 2) The application assembler. 3) The deployer. 4) The system administrator.

Which two of the following must be included in every ejb-jar file? 1) Stubs for the EJBHome and EJBObject interface. 2) The JAR Manifest file. 3) A deployment descriptor. 4) The JNDI context. 5) The EJB's home interface.

Which statement about session beans is true?

Which of the following can be directly invoked by the client?

Which is the method available in SessionContext interface?

Which statements about a session bean class are true?

Upon invoking getRollbackOnly() method by a business method in an entity bean, which transaction attribute settings will lead the ejb container to throw an exception?

When a session bean has container-managed demarcation value of 'Supports', which three methods run in an unspecified transaction context? 1) ejbActivate 2) getRollbackOnly 3) getUserTransaction 4) ejbRemove 5) afterBegin 6) afterCompletion

EJB system's performance tuning is the responsibility of

The EJB Transaction Attribute that ensures the method call that always takes place in a transaction, either client started or container started' are

JMS is mainly used to send and receive message from one application to another.

Abbreviate the term JMS?

A message driven bean is like statefull session bean that encapsulates the business logic and doesn't maintain state.

EJB QL is a Query Language provided for navigation across a network of enterprise beans and dependent objects defined by means of container managed persistence.

Which case of a session bean obtains the UserTransaction object via the EJBContext using the getUserTransaction() method in EJB transaction management?

Which services are provided to EJB components by the EJB container?

Which EJB container must provide an implementation of Java Naming and Directory Interface (JNDI) API to provide naming services for EJB clients and components?

Which session bean maintain their state between client invocations but are not required to maintain their state across server crashes or shutdowns?