Programming Business Logic using EJB

1. WORA stands for _________________. [0.5] a) Write Once Read Always c) Work Once Run Afterwards.

Programming Business Logic using EJB

1. WORA stands for _ [0.5]

a) Write Once Read Always c) Work Once Run Afterwards.

b) Write Once Run Anywhere d) Wrong Out Read Again.

2. Which of the following is not an advantage of the multi-tier application model

[1.0]

a) Providing user interaction,

using client-side applications c) Platform independence

b) Programming business logic d) Relying on backend services

3. Which of the following statements is not true regarding EJB [1.5]

a) It is container dependent c) It collects all the common

elements present during the development of server-side processes and applications

5. A in EJB is an object that is deployed on

any EJB server

[0.5]

6. Which of the following statements is false with respect to a distributed application.

[1.5]

a) Processing is distributed

across multiple networked

computers

c) It allows for a more

accessible business system

b) It is based on a two-tier

application development d) The user interface is on one network while the business

rules and database is on another network

7. _ is not a model for developing distributed applications

9. Which of the following statements does not describe a component [2.0]

a) It is an object d) It can be described as a

chunk of logic

b) Performs a set of functions e) It has an independent

existence of its own.

c) Can consist of one or more

classes

10 Server side component architecture manages the components during

[1.0]

11 Which of the following lines pertaining to local objects are true [2.0]

a) They are created in a totally

a) Client side component

architecture c) Server-side component architecture.

13 The J2EE platform does not contain middleware services [0.5]

14 Match the following:

1 EJB a) It acts as a relational database

2 JDBC b) It allows asynchronous communication

3 JTA c) It is a component technology

4 JMS d) It is used for reliable transaction support

[2.5]

a) 1 – a, 2 – b, 3 – c, 4 – d c) 1 – d, 2 – b, 3 – a, 4 – c

b) 1 – c, 2 – a, 3 – d, 4 – b d) 1 – d, 2 – c, 3 – b, 4 – a

15 Multiple connections from the client are taken care of by the

[0.5]

a) Remote reference layer c) Skeleton layer

16 The is an implementation of CORBA [1.0]

a) Enterprise Java Beans c) Java Transaction API

b) Java Messaging Service d) Java IDL

17 Socket communication is ideal for exchanging files or small amounts of

19 The supports communication

a) remote reference layer c) transport layer

20 Method calls by the client, to the remote object leads to an invocation

of a method on the _which in turn passes control to the _ layer

[1.5]

a) transport layer/top c) remote reference

layer/lowermost

b) stub/underlying d) transport layer/next

21 Providing a user-defined interface can change the implementation of

22 A _ must be acquired to the remote object, before a

client can invoke a method on that object

[1.0]

23 Arrange the Events given below in the correct sequence.

1) The skeleton contacts the remote registry

2) The object method is called

3) Invocation of the stub

4) Result is passed to the client object

Forwarding the request the reference layer

a) remote reference layer c) skeleton layer

26 At present, is used by RMI to communicate between

the transport layer and the _ transport layer

[1.5]

a) IPX/PX, client, user c) Remote access, remote,

network

b) NetBEUI, proxy, host d) TCP/IP, client, server

27 The remote registry is stored on the client [0.5]

28 Which of the following classes belong to the java.rmi package [1.0]

29 The _ does not have any methods [1.0]

a) MarshalledObject d) Remote Interface

c) RegistryHandler

30 Arrange the order in which a remote object will be created and

registered

1.Create the stub and skeleton classes

2.Create the Remote interface

3.Create and register the Remote object

4.Create a class that implements the Remote interface

5.Copy the Remote interface and stub file to the client

[2.0]

a) 1 – 2 – 3 – 4 – 5 c) 5 – 1 – 3 – 4 – 2

b) 3 – 2 – 1 – 5 – 4 d) 2 – 4 – 1 – 5 – 3

31 The interfaces and classes of the package are

used to handle and register remote objects by name [1.0]

a) java.rmi.server package c) java.rmi.package

b) java.rmi.registry package d) java.rmi.activation package

32 Remote objects are always referenced through an interface [0.5]

33 The client object can call all the methods of the remote object Do you

agree with this statement?

35 The statements given below define the implementation of the Remote

Interface Which of these is not true

[2.0]

a) Classes that implement the

remote interface generally

extend the

‘UnicastRemoteObject’ class

c) The implementation class

also implements all the methods present in the remote interface

b) The implementation class

does not require a

constructor.

d) The implementation class

has a main() function

36 How many errors are there in the following code snippet.

37 Which of the following lines of code will be required to register the class ‘Myex’, where

the name of the host machine is stored in ‘hostName’ and the name used by the client to

call the remote object is ‘myobj’

38 The _ compiler is used to register the class that

implements the remote interface, with the remote registry

[1.0]

39 When the compiler is executed for the ‘Myex.class’ program, then the

following files are generated (Choose the correct answer/s) [1.5]

40 The command required to start the RMI registry is

[1.5]

a) start rmiregistry c) execute rmiregistry

41 For listening to incoming requests the RMI registry uses port

a) Multi-tier applications c) Components.

b) Application servers d) Middleware.

44 The meets the low-level run time

execution environment required by EJB applications [1.0]

a) Container provider c) Server provider

45 Match the following.

1.Bean provider a) It takes prewritten components and deploys them

2.Application assembler b) It provides reusable components

3.Deployer c) It is similar to the container provider

[2.5]

4.Server provider d) It is used for putting the components together

a) 1 – a, 2 – b, 3 – c, 4 – d c) 1 – d, 2 – c, 3 – b, 4 – a

b) 1 – b, 2 – d, 3 – a, 4 – c d) 1 – c, 2 – a, 3 – d, 4 – b

46 The EJB _ consists of the EJB , which in

turn contains the EJB _

49 Interaction with the bean by the client is done using the

_ interface and the _ interface [1.0]

50 The _ acts as a buffer between the bean and

the outside world

[1.0]

a) Component c) Container

51 Which of the following statement is false with respect to the EJB

b) It provides services to the

53 Which of the specifications is not available in EJB1.1? [2.5]

a) Session Beans c) Java Messaging Service

(MDB)

54 The Life cycle of EJB is defined by [2.5]

a) Remote Interface c) Implemented by User

b) Home Interface d) None of the above

55 Match the following directory services (2.5) [2.5]

57 Marshalling is the process that converts arguments and return values

into _ that can be sent over the network

[2.5]

b) bits of information d) bits and bytes.

58 Stub file resides on the server State whether the statement is true or

59 Depending on the environment, the deployer adapts the

_, _ and _ to that environment

[1.5]

a) beans/server/container c) server/component/database

interface/middleware/hardware

b) object d) server

61 Which of the following is not an example of EJB server/container [1.0]

b) Jakarta Tomcat’s Jboss e) Oracle’s Oracle Application

Server

c) SQL server

62 Assembling of the deployable server side components, at the

customers end is done by the

[1.0]

a) application assembler c) client

63 Which of the following is not a function of the application server [1.5]

a) Mapping components which

are different from each other

c) Providing a user interface

b) Providing an environment in

which the enterprise bean

can run

d) Making sure that the

component is like a given entity

64 The EJB deployer is unaware of the operational environments [0.5]

65 Match the following.

1.Consistency a) changes stored permanently

2.Isolation b) changes are not saved

3.Atomicity c) prevents viewing till transaction is

committed

[2.0]

4.Durability d) one logical unit

a) 1 – b, 2 – c, 3 – d, 4 – a c) 1 – a, 2 – b, 3 – d, 4 – c

b) 1 – d, 2 – c, 3 – a, 4 – b d) 1 – c, 2 – a, 3 – b, 4 – d

66 As of now, the terms container and EJB server in EJB can be used

inter-changeably Do you agree with this statement?

[1.5]

67 Adaptation of the access level of beans to fit into a particular system is

done by the system administrator

[1.0]

68 The management tools used by the EJB server and container are

controlled by the _ 1.0

69 Identify the services that the container or the server fails to provide [2.0]

a) Security support c) Persistence support

b) Writing of code d) Management of multiple

instances

70 The properties that characterize transactions are known as ACID

71 The _ notification at given at the start of the

transaction, signals the start of the transaction [1.0]

74 The person deploying the bean specifies the for

that bean for better

77 For efficient management of multiple instances, the server performs a

variety of tasks Which of the tasks mentioned below, is not one of [2.0]

a) Instance passivation c) Message pooling

pooling

a) Remote Interface c) Implemented by User

b) Home Interface d) None of the above

79 The specifications set by EJB need not match with those of the

component interface

[0.5]

80 When the client calls a bean, it can in turn call another bean Do you

agree with this statement?

82 A session bean being used by a client can also be used by another

client

[0.5]

83 The instantiation of a session bean is done by the

while the management of the lifetime of the bean is done by the _

[1.5]

a) EJB server/container c) Component/client

b) Container/EJB server d) Client/component

84 Once the client ceases to exist, the session bean is also destroyed

State True or False

[0.5]

85 Suppose in a garment shop, a request is made for all the colors

available in a particular garment along with the all the sizes and their respective prices, then which session bean will be used to handle such processes?

[1.5]

a) Stateful session bean b) Stateless session bean

86 Stateless session beans are also known as

_

[1.0]

a) Stateful session beans c) Anonymous method

providers

87 Measuring in terms of throughput and resource consumption,

beans provide the highest performance

[2.0]

a) Stateless session beans c) Entity beans

b) Stateful session beans

88 When multiple clients try to access the same bean, then the developer

needs to take care of instantiating an equal number of components for servicing the multiple clients

[1.5]

a) Stateful session beans c) CMP

b) State less session beans d) BMP

90 In J2EE Design Business process is represented as

and Business data is represented as

91 Which of the following statement does not represent an entity bean [1.5]

a) They are shared by multiple

clients c) An entire chunk of data can be read once into an entity

93 If a is being used then all the operations need to be

written by the developer to a persistent API

[0.5]

a) Bean-Managed persistent

entity bean.

b) Container-Managed

persistent entity bean

94 _ beans have a higher level of reuse [1.0]

a) Session beans c) Stateful session beans

a) The instantiation, destroying

and reuse of a bean by the

EJB container

b) If the bean is not required after use, then the container destroys it

b) If a requested bean has to be

created, then the container

does the instantiation

d) All of the above.

96 A is a group of operations, which appear as one large

97 At the time of creation, beans are written as

components, while during deployment they are _ components

[1.0]

a) Distributed/individual c) Networked/single

b) Separate/distributed d) Whole/networked.

98 The bean class is different from a Java class [0.5]

99 The implementation of a session bean is the same as an entity bean

Do you agree with this statement? Select the correct reason to support your answer

[1.5]

a) Yes – because both are types

of enterprise javabeans

c) Yes – because the

implementation details of the components are present in the bean class

b) No – because entity beans

relate to persistent objects,

whereas session beans

contain business-process

related logic.

100 The bean class has to portray a set of methods specific to beans,

when the as per the EJB specification are implemented

a) The bean class is confirmed c) None of the above

b) The enterprise beans can

share all the properties of the

serializable objects

d) Both a and b

102 What takes place when a client invokes a method on a bean? [1.5]

a) The bean is directly invoked c) The EJB container delegates

the client request to the bean instance.

b) The EJB container intercepts

the call by the client

d) The EJB container delegates

the client request to the bean instance

103 Which of the following is not a management function performed by an

a) Container logic c) Bean instance logic

b) Security logic d) Transaction logic

104 Which of the following statements is not true regarding an EJB object [2.0]

a) The EJB container manifests

itself as a single

network-aware object

c) This is the original object aware of networking, transactions and security.

b) The network-aware object is

also called the EJB object

d) This object performs the

intermediate logic necessary for the EJB container to service the method calls

105 The interface, which duplicates the methods exposed by the bean

class, is called the _

[1.0]

a) Remote interface c) External interface

b) Home interface d) Internal interface

106 Which of the following functions does the remote interface perform? [1.5]

107 All the remote interface types extend the

109 The _ method is used to delete an entity

bean from the persistent store

111 The client is unaware of the physical location of a remote object in

EJB Do you agree with this statement?

a) Home Object c) Container

113 Only entity beans can be destroyed by passing the

_

[1.0]

a) EJBMetadata object c) Secondary key

114 Which of the following is not the responsibility of the EJB home object [1.5]

a) Make a copy of every

method exposed by the

bean class.

c) Instantiate an EJB object.

b) Remove the EJB objects d) Search for an existing EJB

object

115 The deployment descriptor is essentially a file [0.5]

116 Choose the correct answer/s from below.

The deployment descriptor contains essential information regarding _

[2.0]

a) Remote interface d) Home interface

c) Classes that form the bean

117 Can a blank method be added in Home interface as per EJB 1.1 [1.0]

119 Deployment descriptors provide persistence requirement, wherein the

EJB container is informed whether a session bean can take care of persistence on its own, or whether it should delegate the persistence

to the container Do you agree with this statement?

[2.0]

120 Generation of the EJB object, and the home objects, and tuning the

bean, are functions that have to be performed by the _

a) Entity bean/session bean b) Session bean/entity bean

122 Session beans are able to survive machine crashes Do you agree

with this statement? Give reasons for your answer

[1.0]

a) Yes – because they are

enduring objects c) Yes – because they can be constructed in memory from

the data in the database

b) No – because they die along

with the surrounding

environment.

d) No – because they represent

business logic

a) Container calling methods of

bean

c) Methods representing business logic

b) Non-enduring methods d) Methods representing

business data

124 _ session beans are more functional,

as they can retain their conversational state

128 Deployment descriptors are that describe the bean

and some of its runtime behavior to the container

[2.5]

a) jar files c) serialized classes

132 The _ is a gateway for the bean to interact

with the container

133 The container may not call the ejbRemove() method Why? [1.5]

a) Because the life of the bean

has expired

c) Because the bean is an

entity session bean

b) Because the bean is a

stateless session bean

d) Because of a container crash.

134 Study the code given below The method simpleint() given below is

[2.0]

a) ejbCreate() method c) ejbPassivate() method

b) business method d) ejbActivate method

135 Binding is an association of a _ with a/an

136 Which of the following is not a step involved in JNDI? [2.0]

a) Specify initial context factory c) Acquire Initial context

b) Information for Service

provider to start up d) Connecting the bean with the container

a) Stateful session beans c) CMP

b) State less session beans d) BMP

138 The major advantage of bean pooling is that there is maximum

utilization of time and resources

[0.5]

140 Point out the error in the following code, assuming that a remote

interface ‘myeg’ has already been created

b) Error in line 3 – the package

javax.ejb EJBHome needs to

be extended

d) Error in line 5 – two

exceptions cannot be thrown together

141 While defining the bean class, are the following statements valid:

………

………

public void ejbActivate(){}

public void ejbPassivate(){}

public void ejbRemove(){}

………

[2.5]

a) Yes – they are valid b) No – they will generate an

error

142 Which of the following methods of stateless session beans never have

their callback methods invoked [2.5]

144 The process of swapping out a bean and saving the conversational

state to a storage device is known as _

[1.0]

145 At any point of time _ instance/s of stateful

sessions beans are/is allowed in the container when there are clients making requests

a) Last remote user c) Last recently used

b) Least recently used d) Least resource utilized

148 Once the server has been started, the client code can be executed

from the same window

[1.0]

149 Arrange the activation process in the proper sequence.

1) Serialize the bean state

2) Conversational state is read back into memory

3) The ejbActivate() method restores the resources of the bean

Container reconstructs the memory state

a) Nothing important, these lines

just have to be compulsorily

given

c) Indicates the way to locate

the client, which is 1099

b) Indicates the way to locate

the server, which is 1099 d) Mentions how the bean will interact with the container

151 What do the following lines of code indicate? (2)

a) Stateless session bean class

has been created

c) The above method will begin a conversation with

the client in a stateful session bean.

b) Simply, a variable myvar has

been declared

d) None of the above.

152 Point out the error/s in the following code for the creation of the

b) Error in line 1 and 5 d) Error in line 3

153 Assume that the files Myeg, Myeghome and Myegbean representing

the remote interface, home interface and the bean class

respectively, have been created in the myeg directory What will

the following command do:

jar cvf myeg.jar Myeg.class Myeghome.class Myegbean.class

[2.5]

a) Create a myeg.jar file in the

META-INF directory c) Will give an error

b) Create a myeg.jar file in the

current directory

d) None of the above.

154 Assume that the files Myeg, Myeghome and Myegbean representing

the remote interface, home interface and the bean class

respectively, have been created in the myeg directory What will

the following command do and will this jar file work with the client

code?

jar cvf myeg.jar Myeg.* Myeghome.* Myegbean.* META-INF

[2.5]

a) It will create a myeg.jar file

and will include all the java

files also Yes, it will work

with the client code.

c) It will create a myeg.jar file

and will include only the class files and it will work with the client code

b) It will create a myeg.jar file

and will include only the class

files but it will not work with the

client code

d) It will generate an error.

155 Assume that the files Myeg, Myeghome and Myegbean representing

the remote interface, home interface and the bean class

respectively, have been created in the myeg directory Will the

following command work with the client code Give reasons for

your answer

jar cvf myeg.jar Myeg.class Myeghome.class Myegbean.class

[2.5]

a) Yes it will work normally with

the client code

c) No it will not work with the client code, as the files in the META-INF directory are not included.

b) No it will not work with the

client code, as the jar file

needs to be created in the

META-INF directory

d) None of the above.

156 To run the client, the server [1.5]

a) Needs to be started before

we run the client c) Need not be started.

b) Needs to be started after we

run the client

d) None of the above.

157 In order to start the server, we need to give the

_ command at the command prompt

[1.0]

158 The passivation process is the opposite of the activation process [0.5]

159 If invocation/s is/are required, then

stateful session beans need to be used, whereas for _ method call/s the stateless session bean has to be used

a) There are a lot of input/output

bottlenecks c) Client-specific data needs to be given

b) Increased congestion in the

network

d) Pooling is simple.

161 There is an increased chance of losing conversations while using

stateless session beans

163 The conversation with the client _ be lost, due

to caching of client conversation, while using stateful session beans

[1.0]

b) will always d) none of the above

164 What are the don’ts while using stateful session beans? [1.5]

conversation long.

c) Try to use EJB products that

persists stateful conversations

b) Always write the client code

that takes into account bean

failures

d) None of the above

165 The rules for the conversational state are put forward by

[2.0]

b) Java object serialization d) The client

166 The _ method is used to read the

conversational state back into the memory

[1.5]

167 Which of the following files is not included in the jar file [1.5]

b) remote interface d) client code

168 To be able to execute the bean, the jar file needs to be copied to the

directory of the server

[1.0]

169 Stateful session beans tend to be specific to one scenario Do you

agree with this statement?

[2.0]

170 Stateful session beans are dedicated to _ client/s and

have a preset period

[2.5]

171 Stateless session beans are dedicated to one client [2.0]

172 A client is able to maintain a connection to a stateless session bean’s

_, but the _ itself is free to service requests from anywhere

[2.5]

a) container/server c) server/component

b) component/container d) EJB object/bean

173 Since the stateless session bean does not contain any

_ information, there is _ between one client and the next

[2.5]

a) State/no difference c) Bean/always a similarity

b) Conversational/difference d) None of the above.

174 Stateless session beans often perform services that are fairly generic

in nature and are reusable Do you agree with this statement

[2.0]

175 Entity beans are called _ objects [0.5]

176 To be able to deploy entity beans, the EJB container has to be

compliant with Enterprise JavaBeans version 1.0 [1.0]

c) The state of an entity bean is

permanently stored in the database

b) Persistence is expected to

operate with transactional

integrity

d) Entity beans are durable

178 In EJB, persistence can also be termed as [1.0]

a) Object serialization c) EJB object

179 Which is not a way of making an object persistent [1.5]

a) Object Database Management

180 The capturing of Java Objects in their current state for permanent

storage is known as

[1.0]

a) Object capturing c) Object Serialization.

b) Object Database Management

182 Which of the following statements is not part of the Java object

a) It consists of a simple method

to marshall an object graph

into a compact representation

c) This enables the developer

to pull the data over a network.

b) The serialization of a graph

converts it into a byte stream

d) The data may be saved as a

stream to a storage

183 In _ databases, each Java object is

decomposed into its constituent part, which is stored separately

185 Either or _ can be used to map

the object data to the relational database, while saving the objects

[1.0]

186 Arrange the sequence in which the object is read back from a

relational database

1.The object is instantiated from the Java class

2.The data is read from the database

3.The field of the Java class instance is populated with the data

b) Java serialization d) Object-relational

189 Sun’s JavaBlend and Object People’s TOP link are examples of a/an

190 Programming to a relational database is required in object database

management

[0.5]

a) Other Query Language c) On Question loop

b) Object Query Language d) Oriented Question language

192 Which line does not describe the object database management

system

[1.5]

a) The OQL adds a layer of

abstraction from the relational

database queries

c) Object oriented databases

give better mapping between the entity bean and the database

b) A decomposed part of the

object forms a row in the

relational database

d) Serializable objects can be

stored in the object-oriented database

193 Systems based on mainframe and non-relational database

applications are

[1.0]

a) Persistence systems c) Java object serialization

b) Object database management

194 CMP’s are preferred to BMP’s in legacy systems [0.5]

195 The calculation of the salary of an employee will be handled by the

component

[1.5]

a) Application logic

component

c) None of the above

b) Persistent data component

196 The employee details, i.e., the name, designation, H.R.A, D.A., etc

will be managed by the _ component

[1.5]

a) Application logic component c) None of the above

b) Persistent data component

197 Which of the statements given below does not answer the following

question

Why is data treated as an object?

[1.5]

a) It is simple to treat data as an

object c) Middleware services can be gained

b) Related data can be grouped d) None of the above.

198 Choose the correct answer/s from below.

Entity beans are persistent by themselves, because they

include:-[2.0]

processes

c) Object database persistence

199 Which of the following statements is false regarding entity beans [1.5]

a) Entity beans may last for years c) The entity bean instance is

an instance of the entity bean class

b) Entity beans can survive a

JVM crash

d) None of the above.