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Basic Enterprise Java Beans - EJB MCQ

1. Which of the following statements is not correct for an Enterprise Java Bean?

Entity beans model business data

Session beans model business processes

Message beans send synchronous messages

None of the above

Answer

Correct Answer: Message beans send synchronous messages

Note: This Question is unanswered, help us to find answer for this one

2. The following method signature is found in an implemented entity bean named 'CustomerBean.' 'CustomerPK' is a class representing the primary key.

public CustomerPK ejbFindByPrimaryKey(CustomerPK key)
throws FinderException

By context look up, a client gets the reference to the home object of the above bean, named 'custHome'. It gets the 'CustomerPK' class named 'PK' by a different method. The name of EJBObject is 'Customer', which represents a customer. Which of the following options will you select to invoke the above mentioned method in the client?

Customer = custHome.findByPrimaryKey(PK);

Customer = custHome.ejbFindByPrimaryKey(PK);

custHome = custHome.ejbFindByPrimaryKey(PK);

Customer = findByPrimaryKey(PK);

PK = custHome.findByPrimaryKey(PK);

Answer

Correct Answer: Customer = custHome.findByPrimaryKey(PK);

Note: This Question is unanswered, help us to find answer for this one

3. Which of the following statements is not correct with regard to Passivation of beans?

The process is possible in all the enterprise beans

It is accompanied by some vendor specific methods, which are similar to java serialization

Both a and b

None of the above

Answer

Correct Answer: The process is possible in all the enterprise beans

Note: This Question is unanswered, help us to find answer for this one

4. Which of the following transaction modes are supported by Enterprise Java Beans?

TX_NOT_SUPPORTED

TX_BEAN_MANAGED

TX_REQUIRED

TX_MANDATORY

All of the above

Answer

Correct Answer: All of the above 

Note: This Question is unanswered, help us to find answer for this one

5. Which of the following statements is correct with regard to entity, session, and message-driven beans?

All of them allow sending messages

All of them must define a remote and home interface

Both a and b

None of the above

Answer

Correct Answer: All of them allow sending messages

Note: This Question is unanswered, help us to find answer for this one

6. What are the three classes that a Session EJB class must provide?

Home Interface, EJB Remote Interface, and Session context

EJB class, Home Interface, and EJB Remote Interface

EJB class, Session context, and EJB Remote Interface

EJB class, EJB Remote Interface, and Session Synchronization Interface

Answer

Correct Answer: EJB class, Home Interface, and EJB Remote Interface

Note: This Question is unanswered, help us to find answer for this one

7. One of the methods of your entity bean retrieves the names of all the patients admitted in a particular ward of a hospital. Using a connection named 'con', you want to execute the following query:

//secId is the parameter received by the method
String query = "SELECT admissionId, patientFirstName, patientLastName FROM ADMISSION WHERE sectionId=" + secId;

Which of the following options will help you execute the query?

Statement stmt=con.createStatement(); ResultSet rs=stmt.executeQuery(query);

Statement stmt=new Statement(); ResultSet rs=stmt.executeQuery(query);

Statement stmt=con.createStatement(); ResultSet rs=stmt.execute(query);

Statement stmt=con.getStatement(); ResultSet rs=stmt.executeQuery(query);

Statement stmt=con.getStatement(); ResultSet rs=con.executeQuery(query);

Answer

Correct Answer: Statement stmt=con.createStatement(); ResultSet rs=stmt.executeQuery(query);

Note: This Question is unanswered, help us to find answer for this one

8. SessionSynchronization Interface must be implemented to reset the instance variables.

True

False

Answer

Correct Answer: True

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9. To disable the Passivaton process, set the EJBPassivationTimeout() variable to zero.

True

False

Answer

Correct Answer: True

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10. Database connection pooling is beneficial because:

It avoids the overhead of establishing a new database connection

Maintaining an open database connection consumes resources on the database

Both a and b

ODBC is not required for establishing a connection

Answer

Correct Answer: Both a and b

Note: This Question is unanswered, help us to find answer for this one

11. Both RMI and CORBA define messaging protocols called:

OMP

JRMP

IIOP

JRMP and IIOP

OMP, JRMP, and IIOP

Answer

Correct Answer: JRMP and IIOP

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12. You are working with EJB2.0. You have to retrieve a previously saved handle to an EJBObject named 'bookEJBObject.' In order to restart the processing for that particular request, you need to get the remote interface. The following code has been written for the same:

1. ObjectInputStream stream =
2. new ObjectInputStream(new FileInputStream(fileName));
3.
4. Handle bookHandle = (Handle) stream.readObject();
5.
6. BookRemoteInterface bookEjbObject = (BookRemoteInterface) XX() ;

Which of the following should substitute Method XX() of line 6?

javax.rmi.PortableRemoteObject(bookHandle.getEJBObject(), BookRemoteInterface);

javax.rmi.PortableRemoteObject(EJBObject, BookRemoteInterface);

javax.rmi.PortableRemoteObject.narraow(bookHandle.getEJBObject(), BookRemoteInterface.class);

javax.rmi.PortableRemoteObject.narraow(bookHandle, BookRemoteInterface);

bookHandle.getEJBObject()

Answer

Correct Answer: javax.rmi.PortableRemoteObject.narraow(bookHandle.getEJBObject(), BookRemoteInterface.class);

Note: This Question is unanswered, help us to find answer for this one

13. The EJB specification defines six distinct roles in the application development and deployment life cycle. Which of the following roles is not mentioned in it?

Enterprise Bean Provider

EJB Developer

EJB Server Provider

Application Assembler

EJB Deployer

System Administrator

Answer

Correct Answer: EJB Developer

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14. Which of the following constitute the enhancements made to EJB 2.0?

JMS (Java Message Service) integration

Improved support for container-managed persistence (CMP)

Support for RMI/IIOP protocol for network interoperability

Management of beans relationships

All of the above

Answer

Correct Answer: All of the above 

Note: This Question is unanswered, help us to find answer for this one

15. Which of the following statements is not correct with regard to relationships in EJB?

The tag <relationships> is used by CMP to enclose the relations

These can be managed by CMP or BMP

The relationship can be declared in the deployment descriptor

Directional relationship is always multidirectional

Answer

Correct Answer: Directional relationship is always multidirectional 

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16. Which of the following is not implemented by a stateless session bean?

SessionContext

SessionSynchronization

SessionObject

EJBContext

Answer

Correct Answer: SessionSynchronization

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17. You don't have any database recovery/backup system in place. Which of the following statements is true with regard to committed and uncommitted data of your entity bean?

Committed data cannot survive a server crash

Neither committed nor uncommitted data survives a server crash

Both committed and uncommitted data survive a server or database crash

Both committed and uncommitted data survive a server crash if clustering is used

Answer

Correct Answer: Both committed and uncommitted data survive a server crash if clustering is used 

Note: This Question is unanswered, help us to find answer for this one

18. Which of the following statements is correct with regard to JavaBeans and Enterprise JavaBeans?

Both can be visible or non-visible at run time

Both can be deployed as an Active X control

Both require a Manifest file

Both have some mechanism to tell the builder-tool/IDE about their functionality

Both define their deployment descriptors

Answer

Correct Answer: Both have some mechanism to tell the builder-tool/IDE about their functionality

Note: This Question is unanswered, help us to find answer for this one

19. Which of the following services does EJB container provide to a bean?

Support for security

Support for managing multiple instances

Support for persistence

Support for transactions

All of the above

Answer

Correct Answer: All of the above 

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20. The transaction attribute of a bean is set to 'TX_REQUIRES_NEW.' What do you infer about its behavior?

It initiates a new transaction only when the previous one is concluded

It initiates a new transaction without even waiting for the previous one to conclude

It sends the request to the EJB container for initiating a new bean

The bean manages its own transaction

Answer

Correct Answer: It initiates a new transaction without even waiting for the previous one to conclude

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21. Which of the following methods should be invoked by the container to get a bean back to its working state?

EJBPassivate()

EJBActivate()

EJBRemove()

EJBOpen()

EJBActivation()

Answer

Correct Answer: EJBActivate()

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22. Which of the following services does an EJB Server/Container provides to EJB?

Life cycle management and Instance pooling

Activation and Passivation

Transaction and Security support

Enforcement of policies and restrictions

All of the above

Answer

Correct Answer: All of the above 

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23. A heavy tool manufacturing company manages its business and production by using enterprise beans. A session bean named 'Status' is used to get the production status for the day. The following code gets the context:

Context initialContext = new InitialContext();

The bean provides a local client view. For the local home interface named 'StatusHome.' What should be the lookup?

StatusHome statusHome = (StatusHome) initialContext.lookup("java:tools/env/ejb/status");

StatusHome statusHome = Context.lookup("java:tools/env/ejb/status");

StatusHome statusHome = javax.rmi.PortableRemoteObject.narrow( Context.lookup("java:tools/env/ejb/status"),StatusHome.class);

StatusHome statusHome = (StatusHome) javax.rmi.PortableRemoteObject.narrow( initialContext.lookup("java:tools/env/ejb/status"),StatusHome.class);

Answer

Correct Answer: StatusHome statusHome = (StatusHome) javax.rmi.PortableRemoteObject.narrow( initialContext.lookup("java:tools/env/ejb/status"),StatusHome.class); 

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24. Which of the following statements is correct with regard to 'poison' message?

A JMS destination sends this message to the consumer only once

It is not acknowledged by the consumer

JMS destination gets the acknowledgement only once

The process of sending a 'poison' message is possible with all the enterprise beans

Answer

Correct Answer: It is not acknowledged by the consumer

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25. An online shop employs a stateless session bean (named 'Eshop') to process the requests. 'Eshop' uses a declarative transaction management system. The following code is from the xml deployment descriptor file of the bean:

1. <ejb-jar>
2. <enterprise-beans>
3. <session>
4. <ejb-name>Eshop</ejb-name>
5. <home>com.solution.EshopHome</home>
6. <remote>com.solution.Eshop</remote>
7. <local-home>com.solution.EshopLocalHome</local-home>
8. <local>com.solution.EshopLocal</local>
9. <ejb-class>com.solution.EshopBean</ejb-class>
10.
11.
12. </session>
13. </enterprise-beans>
14. </ejb-jar>

The session and transaction attributes are to be coded in the lines numbered 10 and 11. Which of the following options should be used to make the bean work as expected?

<session>Stateless</session> <transaction>Container</transaction>

<session>Stateful</session> <transaction>Bean</transaction>

<session-type>Stateless</session-type> <transaction-type>Container</transaction-type>

<session-type>Stateful</session-type> <transaction-type>Bean</transaction-type>

<session-type>Stateless</session-type> <transaction>Container</transaction>

Answer

Correct Answer: <session-type>Stateless</session-type> <transaction-type>Container</transaction-type>

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26. How do Enterprise Java Beans access the database?

By using Java Database Connectivity

By using Open Database Connectivity

Both a and b

None of the above

Answer

Correct Answer: By using Java Database Connectivity

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27. By interoperating via IIOP, an EJB can directly access:

Existing production systems wrapped in CORBA interface

Existing production systems wrapped in RMI interface

Network Technologies

Messaging Interface

Language Mapping

Answer

Correct Answer: Existing production systems wrapped in CORBA interface

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28. What is the restriction that EJB specification imposes on CMP fields?

They must be public

They must not be transient

They must be non-static

They must be final

All of the above

Answer

Correct Answer: All of the above 

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29. The interface that must be implemented by a stateless session bean is javax.ejb.SessionBean.

True

False

Answer

Correct Answer: True

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30. Which of the following is a language in which IDL compiler of CORBA generates proxies and skeletons?

Mapping proxies

Language map

Language mapping

Proxy language maps

Answer

Correct Answer: Language mapping

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31. You define an enterprise bean as follows:

Public class CalcSessionBean implements javax.ejb.SessionBean

Which of the following method definitions is not mandatory?

public void ejbCreate() {}

public void ejbActivate() {}

public void ejbPassivate() {}

public void ejbRemove() {}

public void ejbObject() {}

public void setSessionContext(SessionContext ctx) {}

Answer

Correct Answer: public void ejbObject() {}

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32. The PrimaryKey class is used to provide each entity bean with a ____________:

Serial identity

Unique, serializable identity

Unique identity only

Not null identity

Serializable identity only

Answer

Correct Answer: Unique, serializable identity

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33. Which of the following is a name of the design pattern not associated with EJB?

Session Facade

Entity Command

Message Facade

EJB Command

Answer

Correct Answer: Entity Command

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34. The methods declared in Session Bean interface are known as Callback (methods).

True

False

Answer

Correct Answer: True

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35. What will happen to the running session beans if the EJB container crashes or restarts?

They will get destroyed

They will keep on running

Their execution will be halted temporarily

None of the above

Answer

Correct Answer: They will get destroyed

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36. The method ejbCreate() allows session beans to perform initializations. Which of the following methods should be called by the container before ejbCreate()?

newInstance()

setSessionContext()

newInstance() and setSessionContext()

ejbRemove()

Answer

Correct Answer: newInstance() and setSessionContext()

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37. A client wants to access Enterprise Java Bean for some processing. The first step will be looking up the class that implements its home interface. Which of the following should be used for the purpose?

JNDI

MTS

JTS

JTA

Java IDL

Answer

Correct Answer: JNDI

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38. The principal finder method that must be implemented by every entity bean class is:

ejbFindByPrimaryKey()

ejbGetByPrimaryKey()

ejbFindPrimayKey()

getPrimaryKey()

getFinder()

Answer

Correct Answer: ejbFindByPrimaryKey()

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39. Which of the following statements is incorrect with regard to the process of Instance Pooling in EJB?

It increases the overall efficiency of the system

It facilitates sharing of 'EJB bean instances' among multiple clients

It is used with stateless session beans

It is used with entity beans

None of the above

Answer

Correct Answer: None of the above 

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40. We are saving a handle to an EJBObject named 'bookEJBObject' for an online book shop:

1. javax.ejb.Handle bookHandle = _____________;
2.
3. ObjectOutputStream stream =
4. new ObjectOutputStream(new FileOutputStream(fileName));
5.
6. stream.writeObject(bookHandle);
7. stream.close();

Which of the following methods should be filled in the blank?

(Handle) bookEJBObject()

bookEJBObject.getHandle()

bookEJBObject.getEJBHandle()

newHandleInstance()

Answer

Correct Answer: bookEJBObject.getHandle()

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41. A pre-cached instance is used to load state information on creation of an EJB.

True

False

Answer

Correct Answer: False 

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42. Which of the following must be implemented by a JMS message-driven bean?

MessageDrivenBean and MessageDrivenContext interfaces

MessageListener and MessageDrivenBean interfaces

MessageProducer and MessageDrivenBean interfaces

ObjectMessage and MessageDrivenBean interfaces

Answer

Correct Answer: MessageListener and MessageDrivenBean interfaces

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43. Which of the following statements are correct with regard to EJB QL?

The EJB QL defines finder methods for entity beans with container managed persistence

EJB QL is introduced in EJB 2.0

EJB QL is provided for navigation across a network of enterprise beans

EJB QL is a language that can be compiled

All of the above

Answer

Correct Answer: All of the above 

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44. Which of the following statements is correct with regard to the method ejbSelect()?

It is similar to finder method of entity beans

It is available to the client for querying

It cannot be used to extract data from other entity beans

It cannot return entity bean/beans

It can return values that are defined as CMP-TYPE

Answer

Correct Answer: It can return values that are defined as CMP-TYPE 

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45. ______ bean supports asynchronous execution.

Entity

Session

Message Driven

Stateful

Answer

Correct Answer: Message Driven

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46. EJB's remote interfaces are split into what two groups?

Class and Instance methods.

Home and Remote methods.

Static and Dynamic methods.

Stateful and Stateless methods.

Answer

Correct Answer: Class and Instance methods.

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47. _____ is a model that enables beans to be saved in an XML format.

Inheritance

Serialization

BeanContext

Long-term persistence

Answer

Correct Answer: Long-term persistence

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48. How many clients can access a stateless session bean?

Two.

Unlimited.

Ten.

One.

Answer

Correct Answer: One.

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49. The listener type of an event must be a descendent of _______.

java.beans.Event

java.util.EventListener

javax.util.EventListener

java.awt.component

Answer

Correct Answer: java.util.EventListener

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50. True or False? EJB technology allows users to isolate their business logic away from the data layer by storing with the presentation layer.

False

True

Answer

Correct Answer: False

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51. _______ is not true of customizers.

Associate the customizer with its target class via BeanInfo.getBeanDescriptor.

Implement a default constructor.

Extend java.awt.component or one of its subclasses.

Extend the java.beans.Customizer interface.

Answer

Correct Answer: Extend the java.beans.Customizer interface.

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52. What is EJB's transaction processing responsible for?

It increases the size of processed transactions.

It decodes and encrypts processes.

It processes transactions.

It divides the processed information into smaller pieces.

Answer

Correct Answer: It divides the processed information into smaller pieces.

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53. What happens if concurrent access is attempted on a single bean?

Both requests are granted, but the bean suffers performance issues.

The request is rerouted to a different interest by the container.

The request is granted, but the bean is frozen until a secondary process unfreezes it.

The request is canceled.

Answer

Correct Answer: The request is rerouted to a different interest by the container.

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54. The ______ is an abstract representation of the container system to access a bean through methods that manage actions of the bean.

component interface

bean object

bean interface

home interface

Answer

Correct Answer: home interface

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55. True or False? When an Application Exception occurs, the ejb container intercepts the exception, rolls back the transaction, and starts the clean up tasks.

True

False

Answer

Correct Answer: False

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56. A ______ property notifies listeners when its value changes.

constrained

static

bound

stateful

Answer

Correct Answer: bound

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57. When you create a combination of read-only and read-write EJBs, what pattern are you creating?

Read-occasionally.

Read-mostly.

Read-sometimes.

Read-partially.

Answer

Correct Answer: Read-mostly.

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58. Are class methods declared by the Home interface tied to a specific instance?

Yes. By the Home interface.

No.

Yes. By the remote interface.

Yes. By the Active interface.

Answer

Correct Answer: No.

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59. ______ is an advantage of a session bean over an entity bean.

A session bean is less resource intensive.

A session bean is more resource intensive.

A session bean has persistent data storage.

A session bean is stateless.

Answer

Correct Answer: A session bean is less resource intensive.

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60. True or False? Enterprise Java bean is a form of Java bean.

True

False

Answer

Correct Answer: False

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61. Use the ______ interface when you need complete control over your bean's serialization.

Listener

BeanContext

Externalizable

Serializable

Answer

Correct Answer: Externalizable

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62. True or False? Client code can access local beans.

True

False

Answer

Correct Answer: False

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63. A ______ property consults listeners before making a change and any one of the listeners may veto the change.

constrained

static

stateful

bound

Answer

Correct Answer: constrained

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64. A ______ class for a bean changes how a bean appears in the builder tool by telling which properties should be listed first or which should be hidden.

BeanContext

Exception

Listener

BeanInfo

Answer

Correct Answer: BeanInfo

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65. If a bean is handling transactions via JTA API, what is happening?

It is handling the container rather than the transaction.

It is handling the transaction rather than a container.

It is handling a container and a transaction.

It is handling neither the transaction, nor the container.

Answer

Correct Answer: It is handling the transaction rather than a container.

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66. When is it ideal to use a singleton session bean?

When the list you will be using is static, such as a price list.

When you are using EJB for checkout reasons in a web store.

When you have a dynamic list such as a list of current customers.

When you have a very long list of dynamic content.

Answer

Correct Answer: When the list you will be using is static, such as a price list.

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67. What two security mechanisms does EJB primarily use?

JCE and JAAS

JAC and JAAS

UVE and DIJ

ETC and DEV

Answer

Correct Answer: JCE and JAAS

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68. True or False? Any public method that is not part of a property definition is a bean method.

False

True

Answer

Correct Answer: True

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69. True or False? A boolean property in a bean class must have a public get method.

False

True

Answer

Correct Answer: False

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70. _____ is not an EJB interface.

EJBHome

BeanContext

EJBObject

EJBContext

Answer

Correct Answer: BeanContext

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71. What is responsible for the user interface logic on a client machine?

Interface client.

User agent.

Java client.

EJB Client.

Answer

Correct Answer: EJB Client.

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72. Can underlying table schemas be changed automatically by your EJB container?

No.

Yes, and they are automatically configured to do so.

Yes, but they must be configured to do so.

Yes, but they need a second program to be installed.

Answer

Correct Answer: Yes, but they must be configured to do so.

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73. Which of the following is a JNDI scope?

Mechanism.

Module

Mode.

Modular.

Answer

Correct Answer: Module

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74. _______ provides a means for modifying the appearance and behavior of a bean within an application builder so it meets your specific needs.

Persistence

Customization

Externalization

Serialization

Answer

Correct Answer: Customization

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75. _______ class does not support serialization.

String

Thread

Component

Vector

Answer

Correct Answer: Thread

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76. What three files are used to control WebLogic Server EJB?

jar-jar.xml, weblogic-ejb-jar.xml, weblogic-cmp-jar.xml

ejb-jar.xml, webjar.xml, weblogic-comp.xml

ejb-jar.xml, weblogic-ejb-jar.xml, weblogic-cmp-jar.xml

ejb-jar.xml, ebj-jar.xml, weblogic-cmp-jar.xml

Answer

Correct Answer: ejb-jar.xml, weblogic-ejb-jar.xml, weblogic-cmp-jar.xml

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77. Object _____ means converting an object into a data stream and writing it to storage.

inheritance

persistence

serialization

passivation

Answer

Correct Answer: serialization

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78. What is an example of a stateful session bean process?

The idling of a website.

The checkout process in a web store.

The processing of java applets.

A web counter counting hits.

Answer

Correct Answer: The checkout process in a web store.

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79. What happens if two calling clients attempt to access a single bean?

The request is channeled redundantly.

The request is canceled and the operation performed again.

EJB becomes corrupted.

The requests are serialized by a container.

Answer

Correct Answer: The requests are serialized by a container.

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80. What kind of programming does Java Message Service provide for EJB?

Event-driven programming.

Results-driven programming.

Information-driven programming.

Data-driven programming.

Answer

Correct Answer: Event-driven programming.

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81. What has replaced the deployment descriptor in the newest version of EJB, 3.0?

JavaScript annotations.

Meta annotations.

Java annotations.

XML notations.

Answer

Correct Answer: Java annotations.

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82. How are EJB's two interfaces referred to?

Static and Dynamic.

Long and Short.

Home and Remote.

Intrinsic and Extrinsic.

Answer

Correct Answer: Home and Remote.

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83. _____ is NOT a method of the EntityBean Interface.

setEntityContext()

ejbNewBean()

ejbLoad()

ejbStore()

Answer

Correct Answer: ejbNewBean()

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84. A ____ tag is used to represent an instance of a class in an XML bean archive.

<class>

<byte>

Answer

Correct Answer: <class>

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85. True or False? A bean class can fire off any type of event except custom events.

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

86. True or False? The properties of a bean affect its appearance or internal state.

False

True

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

87. What is the javax.ejb.spi package used for?

A user interface.

A service provider interface.

A container interface.

A program interface for developers.

Answer

Correct Answer: A service provider interface.

Note: This Question is unanswered, help us to find answer for this one

88. How are stateless session beans different than stateful session beans?

They are not thread-safe.

They are operational.

They are not operational.

They are automatically thread-safe.

Answer

Correct Answer: They are automatically thread-safe.

Note: This Question is unanswered, help us to find answer for this one

89. ______ beans represent persistent data storage.

Entity

Session

Message Driven

Entity and Session

Answer

Correct Answer: Entity

Note: This Question is unanswered, help us to find answer for this one

90. True or False? EJB is a client-side model that encapsulates the business logic of an application.

True

False

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

91. What is asynchronous pattern?

Business services operating with other business services.

The non synchronous operation of business services within EJB.

The simultaneous operation of two programs.

The operation of a single program in different ways.

Answer

Correct Answer: The non synchronous operation of business services within EJB.

Note: This Question is unanswered, help us to find answer for this one

92. What is the EJB container responsible for assigning?

Dynamic session beans.

Static session beans.

JNDI names for EJB session beans.

Stateless session beans.

Answer

Correct Answer: JNDI names for EJB session beans.

Note: This Question is unanswered, help us to find answer for this one

93. _____ bean stores data for a particular user for a single session.

Session

Java

Message

Entity

Answer

Correct Answer: Session

Note: This Question is unanswered, help us to find answer for this one

94. Do clients of EJB instantiate beans directly?

Yes.

No. They need a reference from the EJB container.

No. They need a reference from the Java container.

Yes, and they act immediately.

Answer

Correct Answer: No. They need a reference from the EJB container.

Note: This Question is unanswered, help us to find answer for this one

95. A bean _______ is the code responsible for managing beans and the various interfaces.

object

container

method

class

Answer

Correct Answer: container

Note: This Question is unanswered, help us to find answer for this one

96. A class is serializable if a class's inheritance hierarchy implements _________.

Serializable and Externalizable

Serializable or Externalizable

Event and Listener

Persistence

Answer

Correct Answer: Serializable or Externalizable

Note: This Question is unanswered, help us to find answer for this one

97. What bean represents real-world objects?

Entity bean.

Sessionless Bean.

Stateful Bean.

Singleton Session Bean.

Answer

Correct Answer: Entity bean.

Note: This Question is unanswered, help us to find answer for this one

98. What does it mean when business objects have a state?

They have many clients.

They have no clients.

They have only two clients.

They are limited to a single client at a time.

Answer

Correct Answer: They are limited to a single client at a time.

Note: This Question is unanswered, help us to find answer for this one

99. When injection is not available, what is the alternative?

Nothing is available.

Bean interface.

Java interface.

Java Naming and Directory Interface

Answer

Correct Answer: Java Naming and Directory Interface

Note: This Question is unanswered, help us to find answer for this one

100. What are ACID transactions responsible for?

Reliable database transactions.

Mobile-to-website interfacing.

Customer relations.

Data to processor interfacing.

Answer

Correct Answer: Reliable database transactions.

Note: This Question is unanswered, help us to find answer for this one

101. Which of the following contains the EJB container that provides the services for the EJB component?

Component client.

EJB client.

EJB Server.

Java client.

Answer

Correct Answer: EJB Server.

Note: This Question is unanswered, help us to find answer for this one

102. True or False? A session bean can only be stateless.

False

True

Answer

Correct Answer: False

Note: This Question is unanswered, help us to find answer for this one

103. In passivation, the opposite method from ejbPassivate() is _______.

ejbLoad()

ejbNew()

ejbActivate()

ejbCreate()

Answer

Correct Answer: ejbActivate()

Note: This Question is unanswered, help us to find answer for this one

104. What is CMC?

Container-managed concurrency.

Currently Managed Content

Counter-managed contingency.

Concurrent-managed content.

Answer

Correct Answer: Container-managed concurrency.

Note: This Question is unanswered, help us to find answer for this one

105. What is concurrency control?

The control of a single operation in two different ways.

The control of single operations in different ways.

The control of a single operation in many different ways.

The ensuring that two operations within EJB are generated correctly.

Answer

Correct Answer: The ensuring that two operations within EJB are generated correctly.

Note: This Question is unanswered, help us to find answer for this one

106. Which of the following is one of WebLogic Server's caching abilities?

Caching between transactions.

Processing dual beans.

Processing dual-state beans.

Caching entire programs.

Answer

Correct Answer: Caching between transactions.

Note: This Question is unanswered, help us to find answer for this one

107. If you wanted to control the WebLogic Server EJB’s configuration, what is one of the files you would use?

ejk.xml

erb-jub.xml

erp.txt

ejb-jar.xml

Answer

Correct Answer: ejb-jar.xml

Note: This Question is unanswered, help us to find answer for this one

108. EJB is a framework for _____.

Java

C++

SAP

Windows

Answer

Correct Answer: Java

Note: This Question is unanswered, help us to find answer for this one

109. What file format are all of the descriptor files in?

txt

HTML

PDF

XML

Answer

Correct Answer: XML

Note: This Question is unanswered, help us to find answer for this one

110. EJB stands for ________.

Enterprise Java Beans

Enhanced Java Beans

Enhanced Java Binary

Example Java Bit code

Answer

Correct Answer: Enterprise Java Beans

Note: This Question is unanswered, help us to find answer for this one

111. What format is the deployment descriptor document in?

XML

doc

html

PDF

Answer

Correct Answer: XML

Note: This Question is unanswered, help us to find answer for this one

112. What is RMI-IIOP?

The Java Remote Operation Schedule.

Java Remote Method Invocation interface.

The Java Open Access Module.

The Java Express Services Daemon.

Answer

Correct Answer: Java Remote Method Invocation interface.

Note: This Question is unanswered, help us to find answer for this one

113. EJB applications are deployed on a ____ compliant Application Server.

IEEE

J2EE

OSHA

SERI

Answer

Correct Answer: J2EE

Note: This Question is unanswered, help us to find answer for this one

114. True or False? Enterprise Java 2.0 specification introduces the concept of local beans.

True

False

Answer

Correct Answer: True

Note: This Question is unanswered, help us to find answer for this one

115. _______ is not a tag used in an XML bean archive to define a primitive type.

<byte>

<int>

Answer

Correct Answer: <object>

Note: This Question is unanswered, help us to find answer for this one

116. The _______ file is an XML file used to describe the properties of a bean.

Application archive

Bean JAR

Deployment Descriptor

XML Property

Answer

Correct Answer: Deployment Descriptor

Note: This Question is unanswered, help us to find answer for this one

117. The _______ is the most common exception class.

EJBException

BeanException

NullPointerException

RuntimeException

Answer

Correct Answer: EJBException

Note: This Question is unanswered, help us to find answer for this one

118. Where are the EJB classes utilized by applications retained?

Within the javax.ejb package.

Within the Jxva package.

Within the Javascript package.

Within the rava.xml package.

Answer

Correct Answer: Within the javax.ejb package.

Note: This Question is unanswered, help us to find answer for this one

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Basic Enterprise Java Beans - EJB MCQ

1. Which of the following statements is not correct for an Enterprise Java Bean?

3. Which of the following statements is not correct with regard to Passivation of beans?

4. Which of the following transaction modes are supported by Enterprise Java Beans?

5. Which of the following statements is correct with regard to entity, session, and message-driven beans?

6. What are the three classes that a Session EJB class must provide?

8. SessionSynchronization Interface must be implemented to reset the instance variables.

9. To disable the Passivaton process, set the EJBPassivationTimeout() variable to zero.

10. Database connection pooling is beneficial because:

11. Both RMI and CORBA define messaging protocols called:

13. The EJB specification defines six distinct roles in the application development and deployment life cycle. Which of the following roles is not mentioned in it?

14. Which of the following constitute the enhancements made to EJB 2.0?

15. Which of the following statements is not correct with regard to relationships in EJB?

16. Which of the following is not implemented by a stateless session bean?

17. You don't have any database recovery/backup system in place. Which of the following statements is true with regard to committed and uncommitted data of your entity bean?

18. Which of the following statements is correct with regard to JavaBeans and Enterprise JavaBeans?

19. Which of the following services does EJB container provide to a bean?

20. The transaction attribute of a bean is set to 'TX_REQUIRES_NEW.' What do you infer about its behavior?

21. Which of the following methods should be invoked by the container to get a bean back to its working state?

22. Which of the following services does an EJB Server/Container provides to EJB?

24. Which of the following statements is correct with regard to 'poison' message?

26. How do Enterprise Java Beans access the database?

27. By interoperating via IIOP, an EJB can directly access:

28. What is the restriction that EJB specification imposes on CMP fields?

29. The interface that must be implemented by a stateless session bean is javax.ejb.SessionBean.

30. Which of the following is a language in which IDL compiler of CORBA generates proxies and skeletons?

31. You define an enterprise bean as follows: Public class CalcSessionBean implements javax.ejb.SessionBean Which of the following method definitions is not mandatory?

32. The PrimaryKey class is used to provide each entity bean with a ____________:

33. Which of the following is a name of the design pattern not associated with EJB?

34. The methods declared in Session Bean interface are known as Callback (methods).

35. What will happen to the running session beans if the EJB container crashes or restarts?

36. The method ejbCreate() allows session beans to perform initializations. Which of the following methods should be called by the container before ejbCreate()?

37. A client wants to access Enterprise Java Bean for some processing. The first step will be looking up the class that implements its home interface. Which of the following should be used for the purpose?

38. The principal finder method that must be implemented by every entity bean class is:

39. Which of the following statements is incorrect with regard to the process of Instance Pooling in EJB?

41. A pre-cached instance is used to load state information on creation of an EJB.

42. Which of the following must be implemented by a JMS message-driven bean?

43. Which of the following statements are correct with regard to EJB QL?

44. Which of the following statements is correct with regard to the method ejbSelect()?

45. ______ bean supports asynchronous execution.

46. EJB's remote interfaces are split into what two groups?

47. _____ is a model that enables beans to be saved in an XML format.

48. How many clients can access a stateless session bean?

49. The listener type of an event must be a descendent of _______.

50. True or False? EJB technology allows users to isolate their business logic away from the data layer by storing with the presentation layer.

51. _______ is not true of customizers.

52. What is EJB's transaction processing responsible for?

53. What happens if concurrent access is attempted on a single bean?

54. The ______ is an abstract representation of the container system to access a bean through methods that manage actions of the bean.

55. True or False? When an Application Exception occurs, the ejb container intercepts the exception, rolls back the transaction, and starts the clean up tasks.

56. A ______ property notifies listeners when its value changes.

57. When you create a combination of read-only and read-write EJBs, what pattern are you creating?

58. Are class methods declared by the Home interface tied to a specific instance?

59. ______ is an advantage of a session bean over an entity bean.

60. True or False? Enterprise Java bean is a form of Java bean.

61. Use the ______ interface when you need complete control over your bean's serialization.

62. True or False? Client code can access local beans.

63. A ______ property consults listeners before making a change and any one of the listeners may veto the change.

64. A ______ class for a bean changes how a bean appears in the builder tool by telling which properties should be listed first or which should be hidden.

65. If a bean is handling transactions via JTA API, what is happening?

66. When is it ideal to use a singleton session bean?

67. What two security mechanisms does EJB primarily use?

68. True or False? Any public method that is not part of a property definition is a bean method.

69. True or False? A boolean property in a bean class must have a public get method.

70. _____ is not an EJB interface.

71. What is responsible for the user interface logic on a client machine?

72. Can underlying table schemas be changed automatically by your EJB container?

73. Which of the following is a JNDI scope?

74. _______ provides a means for modifying the appearance and behavior of a bean within an application builder so it meets your specific needs.

75. _______ class does not support serialization.

76. What three files are used to control WebLogic Server EJB?

77. Object _____ means converting an object into a data stream and writing it to storage.

78. What is an example of a stateful session bean process?

79. What happens if two calling clients attempt to access a single bean?

80. What kind of programming does Java Message Service provide for EJB?

81. What has replaced the deployment descriptor in the newest version of EJB, 3.0?

82. How are EJB's two interfaces referred to?

83. _____ is NOT a method of the EntityBean Interface.

84. A ____ tag is used to represent an instance of a class in an XML bean archive.

85. True or False? A bean class can fire off any type of event except custom events.

31. You define an enterprise bean as follows:

Public class CalcSessionBean implements javax.ejb.SessionBean

Which of the following method definitions is not mandatory?