Quiznetik

Enterprise Computing With JAVA | Set 2

1. Which interface should be implemented by a stateful session bean if it needs to synchronize its conversational state with the transactional context?

A. javax.transaction.UserTransaction

B. javax.ejb.SessionSynchronization

C. javax.ejb.EJBContext

D. javax.transaction.TransactionContext

Correct : B. javax.ejb.SessionSynchronization

2. Which of the following exceptions is thrown by the ejbLoad() method of an entity bean when the database row to be loaded is not found ?

A. NoSuchEntityException

B. EJBException

C. RemoteException

D. ObjectNotFoundException

Correct : A. NoSuchEntityException

3. Which of the following is the format for EJB deployment descriptor files?

A. XML

B. XSL

C. HTML

D. Java

Correct : A. XML

4. EJB is a

A. Middleware

B. Scalable component architecture

C. Component architecture to integrate legacy systems

D. All of the above.

Correct : D. All of the above.

5. Which of the following EJB has no state? i. Message-Driven Bean. ii. BMP Entity Bean. iii. Stateless Session Bean. iv. Stateful Session Bean.

A. Both (I) and (II) above

B. Both (II) and (III) above

C. Both (III) and (IV) above

D. Both (I) and (III) above.

Correct : D. Both (I) and (III) above.

6. Which of the following is true for EJB?

A. EJB is server-side component architecture for distributed applications in Java

B. EJB facilitates scalable, secure and transaction-oriented applications

C. EJB supports portability and reusability

D. All of the above.

Correct : D. All of the above.

7. Which of the following EJB type has no Remote interfaces?

A. Message-Driven Bean

B. BMP Entity Bean

C. CMP Entity Bean

D. none

Correct : A. Message-Driven Bean

8. Which role in EJB architecture is responsible for EJB Server?

A. EJB Deployer

B. Application Assembler

C. Network Engineer

D. Server Provider

Correct : D. Server Provider

9. Which of the EJB has a passive state in its life cycle? I. Stateless Session Bean. II. Message-Driven Bean. III. BMP Entity Bean.

A. Only (I) above

B. Only (II) above

C. Only (III) above

D. Both (I) and (II) above

Correct : C. Only (III) above

10. Which part of multi-tier enterprise application contains EJB component?

A. Application Server

B. Web Server

C. Database Server

D. Fat Client

Correct : A. Application Server

11. Which of the following distributed object technology is/are not included in Java? I. CORBA. II. DCOM. III. RMI. IV. EJB.

A. Only (I) above

B. Only (II) above

C. Only (III) above

D. Only (IV) above

Correct : B. Only (II) above

12. Which of the following is not a property of EJB transaction?

A. Atomicity

B. Consistency

C. Isolation

D. Distributed

Correct : D. Distributed

13. Which of the following is not true for servlet?

A. It is persistent

B. Platform independent

C. High performance

D. It is single threaded.

Correct : D. It is single threaded.

14. Which JSP tag is used to transfer processing to another JSP page?

A. <jsp:include>

B. <jsp:forward>

C. <jsp:redirect>

D. <jsp:useBean>

Correct : B. <jsp:forward>

15. Which of the following is an approach for state maintenance in Web applications?

A. Hidden Form Field

B. URL Rewriting

C. Cookies

D. All of the above.

Correct : D. All of the above.

16. Which of the following is not a container for EJB? I. Internet Information Server. II. Java System Application Server. III. Tomcat. IV. WebLogic.

A. Both (I) and (II) above

B. Both (II) and (III) above

C. Both (III) and (IV) above

D. Both (I) and (III) above.

Correct : D. Both (I) and (III) above.

17. Which EJB usually represents persistent data?

A. Entity Bean

B. Stateless Session Bean

C. Stateful Session Bean

D. Message-Driven Bean

Correct : A. Entity Bean

18. Which is least visibility scope for Java bean in JSP?

A. Page

B. Session

C. Request

D. Application

Correct : A. Page

19. Which of the following is/are true for JSP technology? I. It is persistent. II. Platform independent. III. Browser executes the code.

A. Only (I) above

B. Only (II) above

C. Both (I) and (II) above

D. Both (II) and (III) above

Correct : C. Both (I) and (II) above

20. Which of the following is true for JNDI?

A. Database service

B. Naming and Directory Service

C. Network Service

D. Web Service

Correct : B. Naming and Directory Service

21. Which method of the request object is used to extract values of the input fields in a form when it is submitted?

A. getParameter

B. getParameterNames

C. getValues

D. putValues

Correct : A. getParameter

22. Which of the following is true for CORBA?

A. Protocol for distributed computing

B. Database specification

C. Specification for distributed objects

D. Both (c) and (d) above.

Correct : D. Both (c) and (d) above.

23. Which EJB uses EJB-QL for query operations?

A. BMP Entity Bean

B. CMP Entity Bean

C. Session Bean

D. Message-Driven Bean

Correct : B. CMP Entity Bean

24. Which of the following is true for Java Bean?

A. It can not be a GUI component

B. It never implements serializable interface

C. It has zero-argument constructor

D. It is a distributed component

Correct : C. It has zero-argument constructor

25. Which of the following is not true for <jsp:useBean> tag in JSP page?

A. Locates a bean instance

B. Stores object reference of the bean in a variable

C. Creates an instance if fails to locate the bean instance

D. All the above.

Correct : D. All the above.

26. 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.

Correct : D. Both (III) and (IV) above.

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

A. Page

B. Session

C. Request

D. Global.

Correct : D. Global.

28. 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

Correct : A. 1 and 2

29. 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

Correct : C. 3 and 5

30. 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

Correct : C. The bean’s handle must be provided by the client, in order to ask the EJBHome for removing a session bean

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

A. ejbPassivate

B. business methods

C. setSessionContext

D. newInstance

Correct : B. business methods

32. Which is the method available in SessionContext interface?

A. afterBegin()

B. getRollbackOnly()

C. setSessionCotext()

D. getUserTransaction()

Correct : C. setSessionCotext()

33. 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

Correct : D. The ejbCreate() method must not be a final method

34. 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

Correct : C. Never

35. 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

Correct : C. 1,4,6

36. EJB system’s performance tuning is the responsibility of

A. Bean Provider

B. EJB Deployer

C. Application Assembler

D. Tool Vendor

Correct : B. EJB Deployer

37. 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

Correct : C. TX_REQUIRED and TX_REQUIRES_NEW

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

A. True

B. False

C. none

D. all

Correct : A. True

39. Abbreviate the term JMS?

A. Java Message Service

B. Java Monitor Service

C. Java Message Session

D. Java Monitor Session

Correct : A. Java Message Service

40. 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

Correct : B. False

41. 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

Correct : A. True

42. 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

Correct : A. Bean-managed transactions

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

A. Transaction support

B. Persistence support

C. Naming support

D. All mentioned above

Correct : D. All mentioned above

44. 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

Correct : C. Naming support

45. 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

Correct : C. Singleton Session Bean

46. EJB is a specification for J2EE server, not a product; Java beans may be a graphical component in IDE.

A. True

B. False

C. none

D. all

Correct : A. True

47. A session bean represents a multiple clients inside the Application Server.

A. True

B. False

C. none

D. all

Correct : B. False

48. Which statement characterizes stateless session beans?

A. They allow the PostConstruct, PreDestroy, and PrePassivate life-cycle callbacks.

B. They require home interfaces.

C. When a client looks up a stateful session bean in the JNDI, the same bean is returned every time.

D. They are asynchronous message consumers.

Correct : A. They allow the PostConstruct, PreDestroy, and PrePassivate life-cycle callbacks.

49. A message-driven bean can have an instance of a MessageDrivenContext injected. Which method can be successfully invoked on this interface from a message-driven bean?

A. getEJBHome

B. getCallerPrincipal (*)

C. isCallerInRole

D. getEJBLocalHome

Correct : B. getCallerPrincipal (*)

50. Which statement about entities is correct?

A. Entities must be annotated with the @Entity annotation.

B. Entities can be final classes.

C. Entities can have a single no-arg constructor with protected visibility.

D. Instance variables of an entity can have private, protected, public, or package visibility.

Correct : C. Entities can have a single no-arg constructor with protected visibility.

51. Which statement is correct about the EntityManager API?

A. The merge, persist, remove, and getReference methods must be invoked within a transaction context.

B. It is safe (no exception is thrown) to call merge or getTransaction on a JTA EntityManager instance.

C. The getReference method can throw an EntityNotFoundException.

D. Runtime exceptions thrown by the refresh and createQuery methods of the EntityManager interface do NOT cause the transaction to be rolled back.

Correct : C. The getReference method can throw an EntityNotFoundException.

52. Which statement about JTA and resource-local entity managers is correct?

A. The default transaction type for an entity manager is JTA in both Java EE and Java SE environments.

B. You cannot use a resource-local entity manager in a Java EE environment.

C. The EntityTransaction interface must be used when using a resource-local entity manager. (*)

D. Application-managed entity managers can be only a JTA transaction type.

Correct : C. The EntityTransaction interface must be used when using a resource-local entity manager. (*)

53. Which of the following is not a container for EJB? I. Internet Information Server. II. Java System Application Server. III. Tomcat. IV. WebLogic.

A. Both (I) and (II) above

B. Both (II) and (III) above

C. Both (III) and (IV) above

D. Both (I) and (III) above.

Correct : D. Both (I) and (III) above.

54. Which of the following is/are true for JSP technology? I. It is persistent. II. Platform independent. III. Browser executes the code.

A. Only (I) above

B. Only (II) above

C. Both (I) and (II) above

D. Both (II) and (III) above

Correct : C. Both (I) and (II) above

55. Which method of the request object is used to extract values of the input fields in a form when it is submitted?

A. getParameter

B. getParameterNames

C. getValues

D. putValues

Correct : A. getParameter

56. Which method of the servlet is/are called several times in its life?

A. init()

B. doPost()

C. destroy()

D. Both (a) and (b) above

Correct : B. doPost()

57. Which object is used to forward the request processing from one servlet to another?

A. ServeltContext

B. ServletConfig

C. RequestDispatcher

D. ResponseDispatcher

Correct : C. RequestDispatcher

58. Which of the following allows substitution of code to occur at the translation time in a JSP page?

A. <jsp:include> Tag

B. <@ include> directive

C. <@ page> directive

D. Declaration block

Correct : B. <@ include> directive

59. Which of the following property of Java Bean represents a single value?

A. Simple property

B. Boolean property

C. Indexed property

D. Both (a) and (b) above

Correct : D. Both (a) and (b) above

60. Which of the following is used to redirect the response from a servlet to a JSP page?

A. response.sendRedirect()

B. request.sendRedirect()

C. request.forward()

D. response.forward()

Correct : A. response.sendRedirect()

61. Which of the following is not true for <jsp:useBean> tag in JSP page?

A. Locates a bean instance

B. Stores object reference of the bean in a variable

C. Creates an instance if fails to locate the bean instance

D. Does not execute the body tag if any

Correct : D. Does not execute the body tag if any

62. 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.

Correct : D. Both (III) and (IV) above.

63. Which statement is true for the Class java.util.HashSet?

A. The collection is guaranteed to be immutable.

B. The elements in the collection are unique.

C. The elements in the collection are order

Correct : B. The elements in the collection are unique.

64. Which cannot directly cause a thread to stop executing?

A. Calling a yield method.

B. Calling the start method on another Thread object.

C. Calling the notify method on an object.

D. Calling wait method on an object.

Correct : C. Calling the notify method on an object.

65. Which of the following statement is true?

A. An anonymous inner class can access final variables in any

B. Enclosing scope.

C. An anonymous inner class may be declared as protect

Correct : B. Enclosing scope.

66. Which of the following below are abilities of Reflection API in Java?

A. Determining state of an object

B. Both B and C

C. Determining duplicate classes

D. Determination of the class of an object

Correct : D. Determination of the class of an object

67. Which of the methods should be implemented if any class implements the Runnable interface?

A. start()

B. run()

C. wait()

D. notify() and notifyAll()

Correct : B. run()

68. Business delegate pattern

A. Hides remote services complexity

B. Reduces coupling and increases manageability

C. Eases failure recovery

D. All of the above

Correct : D. All of the above

69. Which of the following is not a life-cycle method for a Stateful Session Bean?

A. Post Construction

B. Pre Destruction

C. Post Activation

D. Pre Construction

Correct : D. Pre Construction

70. Which of the following is true?

A. Preserving of any state across method calls does not performed by Stateless session beans

B. Multiple users can access Stateful session beans at the same time

C. Both are correct

D. none

Correct : A. Preserving of any state across method calls does not performed by Stateless session beans

71. Stateful Session beans contain

A. Home Interface

B. Remote Interface

C. Bean class

D. All of the above

Correct : D. All of the above

72. Which of the following regarding business methods in a bean class is incorrect?

A. Both session bean and entity bean business methods are always same

B. For Java RMI API, the argument and return types must always be legal types

C. The throws clause may include any exceptions defined by your application.

D. None of the above

Correct : B. For Java RMI API, the argument and return types must always be legal types

73. Choose the incorrect statement from the following about Home methods in a bean class for CMP (Container Managed Persistence).

A. The throws clause of the method may include the java.rmi.RemoteException.

B. Relationships must not be accessed by the method

C. The persistence state of the bean must not be accessed by the method

D. The static declaration can not be done for the method.

Correct : A. The throws clause of the method may include the java.rmi.RemoteException.

74. Given the following code in a stateful session bean business method; try { Socket skt = new Socket(x,y); } catch (Exception ex) { ex.printStackTrace(); } Assuming that x and y are the port and IP addresses respectively of a running service, which is running on the same server, which of the following is correct?

A. Failure in Compilation

B. Failure in Deployment

C. An exception is thrown at runtime

D. Indeterminate. The code is not guaranteed to be ported to all EJB 2.0 containers, though it may deploy.

Correct : D. Indeterminate. The code is not guaranteed to be ported to all EJB 2.0 containers, though it may deploy.

75. Which of the following is true about EJB transactions?

A. Nested transactions are supported by EJB 2.0

B. Isolation levels specification is supported by EJB 2.0

C. Bean-managed transaction demarcation must not be used in Message-driven beans

D. Bean-managed transaction demarcation must not be used in Entity beans

Correct : D. Bean-managed transaction demarcation must not be used in Entity beans

76. Which of the following are guaranteed capabilities of EJB 2.0?

A. Run-as security identity functionality.

B. The extension of JDBC 2.0

C. Both A and B

D. Neither A nor B

Correct : C. Both A and B

77. From the following APIs, which API does NOT guarantee to be supported by EJB 2.0 containers?

A. JAXP

B. JNDI

C. JXTA

D. JDBC

Correct : C. JXTA

78. Which component does the Entity bean represent the persistent data stored in the database?

A. Server-side component

B. Client-side component

C. server and client side component

D. None of the above

Correct : A. Server-side component

79. EJB is like COM, Abbreviate the term COM?

A. Component Object Model

B. Component Oriented Model

C. Common Object Model

D. Common Oriented Model

Correct : A. Component Object Model

80. JMS is also known as a messaging service.

A. True

B. False

C. none

D. all

Correct : A. True

81. The life cycle of session bean is not maintained by the application server (EJB Container).

A. True

B. False

C. none

D. all

Correct : B. False

82. What represents a persistent global data from the database?

A. Entity Bean

B. Session Bean

C. Both A & B

D. None of the above

Correct : A. Entity Bean

83. Which component does the Entity bean represents the persistent data stored in the database?

A. Server-side component

B. Client-side component

C. server and client side component

D. None of the above

Correct : A. Server-side component

84. In EJB, middleware services are provided by EJB Container automatically.

A. True

B. False

C. none

D. all

Correct : A. True

85. Which middleware services are provided by EJB?

A. Security

B. Transaction Management

C. Both A & B

D. None of the above

Correct : C. Both A & B

86. Which server-side component is required to be deployed on the server?

A. EJB

B. RMI

C. Both A & B

D. None of the above

Correct : A. EJB