Deck 7: Java Web Development

Question 1

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.

Answer 1

The getReference method can throw an EntityNotFoundException.

Question 2

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.

Answer 2

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

Question 3

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.

Answer 3

Both (I) and (III) above.

Question 4

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

Question 5

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

Question 6

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

Question 7

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

A) ServeltContext
B) ServletConfig
C) RequestDispatcher
D) ResponseDispatcher

Question 8

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

Question 9

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

Question 10

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()

Question 11

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

Question 12

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.

Question 13

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

Question 14

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.

Question 15

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

Question 16

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

Question 17

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

A) start()
B) run()
C) wait()
D) notify() and notifyAll()

Question 18

Business delegate pattern

A) Hides remote services complexity
B) Reduces coupling and increases manageability
C) Eases failure recovery
D) All of the above

Question 19

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

Question 20

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

Question 21

Stateful Session beans contain

A) Home Interface
B) Remote Interface
C) Bean class
D) All of the above

Question 22

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

Question 23

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.

Question 24

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.

Question 25

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