Tài liệu 406 câu trắc nghiệm ejb

Programming Business Logic using EJB 1. 2. 3. 4. WORA stands for _________________. a) Write Once Read Always c) Work Once Run Afterwards. b) Write Once Run Anywhere d) Wrong Out Read Again. Which of the following is not an advantage of the multi-tier application model. a) Providing user interaction, using client-side applications. c) Platform independence b) Programming business logic d) Relying on backend services Which of the following statements is not true regarding EJB. a) It is container dependent. c) It collects all the common elements present during the development of server-side processes and applications. b) It is server-side component architecture. d) Transaction oriented components are written in Java. The client side is more complex than the server side a) True 5. [0.5] [1.0] [1.5] [0.5] b) False A ______________________ in EJB is an object that is deployed on any EJB server. a) Component c) Chunk b) Container d) Logic [0.5] 6. 7. 8. 9. Which of the following statements is false with respect to a distributed application. 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 [1.5] ___________________ is not a model for developing distributed [1.0] applications. a) DCOM c) RMI b) COM d) CORBA Generally, ________________________ objects do not implement any [0.5] interfaces. a) remote c) public b) distributed d) local Which of the following statements does not describe a component. 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. [2.0] 10. 11. 12. 13. Server side component architecture manages the components during ____________. a) Compilation c) logic building b) Development d) run time Which of the following lines pertaining to local objects are true. a) They are created in a totally c) References are obtained different JVM. directly. b) They are interfaces. [2.0] using d) They always implement a remote interface. ______________________________________ enhances reusability [1.0] and portability. a) Client side component architecture. c) Server-side component architecture. b) JVM d) Remote objects. The J2EE platform does not contain middleware services. a) 14. accessed [1.0] True b) False Match the following: 1. EJB 2. JDBC 3. JTA 4. JMS [0.5] [2.5] a) It acts as a relational database b) It allows asynchronous communication c) It is a component technology d) It is used for reliable transaction support 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. 16. 17. Multiple connections from the client are taken care of by the [0.5] __________________. a) Remote reference layer c) Skeleton layer b) Stub layer d) Transport layer The ______________ is an implementation of CORBA. a) Enterprise Java Beans c) Java Transaction API b) Java Messaging Service d) Java IDL Socket communication is ideal for exchanging files or small amounts of data. a) True 18. 19. 20. b) [1.0] [0.5] False The RMI defines the difference between _______________ and [1.0] _______________ objects. a) public/global c) remote/local b) distributed/concentrated d) random/definite The ______________________________ supports communication [1.5] between the stub and skeleton. a) remote reference layer c) transport layer b) stub layer d) Architecture Method calls by the client, to the remote object leads to an invocation [1.5] of a method on the _________which in turn passes control to the _________________ layer. a) transport layer/top c) remote reference layer/lowermost b) stub/underlying 21. d) transport layer/next Providing a user-defined interface can change the implementation of [2.0] the transport layer. a) True 22. 23. 24. 25. b) False A _____________ must be acquired to the remote object, before a client can invoke a method on that object. a) tag c) connection b) reference d) loop 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) 2 – 5 – 3 – 4 – 1 c) 3 – 5 – 1 – 2 – 4 b) 1 – 2 – 3 – 4 – 5 d) 4 – 1 – 5 – 2 – 3 All distributed systems ___________________. consist of _________________ a) remote objects/random objects c) stubs/skeletons b) transport layers/reference layers d) JTA/JMS [1.0] [2.5] and [1.0] The _______________________ is responsible for unicast point-to- [0.5] point invocation. a) remote reference layer c) skeleton layer b) stub layer d) transport layer 26. 27. At present, ____________ is used by RMI to communicate between [1.5] the ____________ transport layer and the _________________ transport layer. a) IPX/PX, client, user c) Remote access, remote, network b) NetBEUI, proxy, host d) TCP/IP, client, server The remote registry is stored on the client. a) True 28. 29. [0.5] b) False Which of the following classes belong to the java.rmi package. a) MarshalledObject c) Naming b) RegistryHandler d) Skeleton The ___________________ does not have any methods. a) MarshalledObject d) Remote Interface b) RMISecurityManager e) Naming [1.0] [1.0] c) RegistryHandler 30. Arrange the order in which a remote object will be created and [2.0] 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. 31. 32. a) 1 – 2 – 3 – 4 – 5 c) 5 – 1 – 3 – 4 – 2 b) 3 – 2 – 1 – 5 – 4 d) 2 – 4 – 1 – 5 – 3 The interfaces and classes of the __________________ package are [1.0] used to handle and register remote objects by name. a) java.rmi.server package c) java.rmi.package b) java.rmi.registry package d) java.rmi.activation package Remote objects are always referenced through an interface. a) True 33. b) False The client object can call all the methods of the remote object. Do you agree with this statement? a) Agree 34. 35. [0.5] Every method of the ______________________. [1.0] b) Disagree remote interface must a) getData() c) getDataNum() b) RemoteException d) interface throw a [0.5] The statements given below define the implementation of the Remote Interface. Which of these is not true. 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. [2.0] 36. How many errors are there in the following code snippet. [2.5] import java.rmi.; public interface MyEx extends Remote { String getDataNum(); String getData(int a) throws RemoteException } a) None c) Five b) Four d) Two 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. 39. a) Myex instance = new Myex(); Naming.rebind(“//”+hostName+”/myobj” , instance)); c) Myex = new Myex(); Naming.(“hostName”, instance)); b) DistributedExImpl instance = new DistributedExImpl(); Naming.rebind(“//”+hostName+” /DistributedExample”, instance)); d) Myex instance = new Myex; Naming.rebind(“//”+hostName+”/myobj”, instance) The _______________ compiler is used to register the class that implements the remote interface, with the remote registry. a) rmi c) rmic b) class d) java When the compiler is executed for the ‘Myex.class’ program, then the following files are generated. (Choose the correct answer/s). a) Myex.java c) Myex.class b) Myex_Stub.class d) Myex_Skel.class [1.0] [1.5] [ 40. 41. 42. The command required ____________________ 44. 45. start the RMI registry a) start rmiregistry c) execute rmiregistry b) rmiregistry d) begin rmiregistry is [1.5] For listening to incoming requests the RMI registry uses port [1.0] ___________. a) 1024 c) 1099 b) 65535 d) 1020 The client is able to directly code the container. Do you agree with this [0.5] statement? a) Agree 43. to b) Disagree Connection pooling and security management are examples of _____________________. a) Multi-tier applications. c) Components. b) Application servers d) Middleware. The ______________________ meets the low-level execution environment required by EJB applications. a) Container provider c) Server provider b) Bean provider d) Deployer run time [1.0] Match the following. 1.Bean provider and deploys them 2.Application assembler 3.Deployer [0.5] [2.5] a) It takes prewritten components b) It provides reusable components c) It is similar to the container provider 4.Server provider together 46. 47. d) It is used for putting the components 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 The EJB ___________ consists of the EJB ____________, which in [1.5] turn contains the EJB ___________. a) components/container/server c) container/server/components b) server/container/component s d) components/server/container The EJB architecture consists of the following tiers. a) Client d) Database b) Container e) EJB server [1.5] Home interface 48. 49. 50. The bean accesses the database using ______________. a) ODBC c) JDBC b) MS-SQL d) server [0.5] Interaction with the bean by the client is done using the [1.0] _____________ interface and the ___________ interface. a) home/remote c) user/EJB b) database/server d) random/client The ___________________ acts as a buffer between the bean and [1.0] the outside world. 51. 52. a) Component c) Container b) EJB server d) Client Which of the following statement is false with respect to the EJB container. a) It consists of a representation c) The bean is aware of the of the bean requested by the methods used by the client. container to implement the services. b) It provides services to the d) It provides support to bean. manage and keep track of beans. The EJB object and EJB home for a bean are managed by the [0.5] container. a) 53. 54. 55. [2.0] True b) False Which of the specifications is not available in EJB1.1? [2.5] a) Session Beans c) Java Messaging Service b) Entity Beans d) Message (MDB) Driven The Life cycle of EJB is defined by__________________. a) Remote Interface c) Implemented by User b) Home Interface d) None of the above Match the following directory services (2.5) Bean [2.5] [2.5] a) LDAP b) NDS c) NIS 56. 57. 58. 1. SUN OS 2. Netscape 3.Novell a) a-2 ,b-3 ,c-1 b) a-2 ,b-1 ,c-3 b) a-1 ,b-2 ,c-3 d) a-3 ,b-1 ,c-2 In JNDI, binding is an association of a ________________ with a/an [2.5] _____________. a) class/library c) client/server b) name/object d) file/directory Marshalling is the process that converts arguments and return values [2.5] into ___________________ that can be sent over the network. a) data c) stream of bytes b) bits of information d) bits and bytes. Stub file resides on the server. State whether the statement is true or false. a) True 59. b) False Depending on the environment, the deployer adapts the [1.5] _________________, _________________ and _______________ to that environment. a) beans/server/container c) server/component/database interface/middleware/hardwar e d) b) client/object/component 60. [2.5] The container along with ___________________. a) client all its interfaces c) beans resides in the [0.5] b) object 61. d) server Which of the following is not an example of EJB server/container. a) IBM’s Websphere d) BEA’s Weblogic b) Jakarta Tomcat’s Jboss e) Oracle’s Oracle Application Server [1.0] c) SQL server 62. 63. Assembling of the deployable server side components, at the [1.0] customers end is done by the ________________. a) application assembler c) client b) client assembler d) server Which of the following is not a function of the application server [1.5] a) Mapping components which c) Providing a user interface are different from each other b) Providing an environment in d) Making sure that the which the enterprise bean component is like a given can run entity 64. The EJB deployer is unaware of the operational environments. a) True 65. b) False Match the following. 1.Consistency 2.Isolation 3.Atomicity committed [0.5] [2.0] a) changes stored permanently b) changes are not saved c) prevents viewing till transaction is 4.Durability 66. 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 As of now, the terms container and EJB server in EJB can be used [1.5] inter-changeably. Do you agree with this statement? a) Agree 67. 69. 70. b) False The management tools used by the EJB server and container are controlled by the _________________. a) EJB deployer c) EJB container b) EJB server d) EJB administrator Identify the services that the container or the server fails to provide a) Security support c) Persistence support b) Writing of code d) Management instances. of 1.0 [2.0] multiple The properties that characterize transactions are known as ACID [0.5] properties. a) True 71. b) Disagree Adaptation of the access level of beans to fit into a particular system is [1.0] done by the system administrator. a) True 68. d) one logical unit b) False The _______________ notification at given at the start of the [1.0] transaction, signals the start of the transaction. 72. a) Start c) Initial b) Begin d) First Can a transactional context be propagated from client? Comment. a) True 73. [2.0] b) False Which transaction attribute cannot be set while deployment a) TX_NOT_SUPPORTED d) TX_NOT_REQUIRED b) TX_SUPPORTS e) TX_REQUIRES_NEW [2.5] c) TX_REQUIRED 74. 75. The person deploying the bean specifies the ________________ for [1.5] that bean for better __________________. a) ACID/transaction c) State of object/consistency b) Start/durability d) ACL’s/security Repeated creation of an object whenever it is required is persistence. a) True 76. [1.0] b) False Constant storage can be done on a file. a) True 77. the [0.5] b) False For efficient management of multiple instances, the server performs a [2.0] variety of tasks. Which of the tasks mentioned below, is not one of them. 78. 79. a) Instance passivation c) Message pooling b) Instance pooling d) Database pooling. The Life cycle of EJB is defined by: c) Implemented by User b) Home Interface d) None of the above The specifications set by EJB need not match with those of the [0.5] component interface. b) False When the client calls a bean, it can in turn call another bean. Do you [1.0] agree with this statement? a) Agree 81. [2.0] a) Remote Interface a) True 80. connection b) Disagree What do A and B represent in the diagrammatic representation given below; (1.5) [1.5] A Session Bean B a) A – Stateful Bean, B – c) A – BMP, B – CMP Stateless Bean b) A – Entity Bean, B – Enterprise d) A – JavaBean, B Bean Enterprise Java Bean – 82. A session bean being used by a client can also be used by another [0.5] client. a) True 83. 84. The instantiation of a session bean is done by the [1.5] ____________________ while the management of the lifetime of the bean is done by the ___________________________. a) EJB server/container c) Component/client b) Container/EJB server d) Client/component Once the client ceases to exist, the session bean is also destroyed. State True or False. a) Yes 85. 87. [0.5] c) No Suppose in a garment shop, a request is made for all the colors [1.5] 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? a) Stateful session bean 86. b) False b) Stateless session bean Stateless session beans are also known as _________________________. [1.0] a) Stateful session beans c) Anonymous providers method b) Container d) Know method providers Measuring in terms of throughput and resource consumption, [2.0] ____________________ beans provide the highest performance. a) Stateless session beans b) Stateful session beans c) Entity 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. a) True 89. 90. [2.0] a) Stateful session beans c) CMP b) State less session beans d) BMP In J2EE Design Business process is ________________ and Business data is __________________. b) Stateless beans 92. False Which of the beans cannot be pooled? a) Session beans 91. b) beans / Entity c) beans/stateful d) represented represented as [2.0] as CMP/BMP Transaction/process Which of the following statement does not represent an entity bean. a) They are shared by multiple c) An entire chunk of data can clients be read once into an entity bean. b) They are modeled on real d) It cannot be manipulated. world objects. The life of an entity bean is as long as the client session. a) True [1.5] b) False [1.5] [0.5] 93. If a ______________is being used then all the operations need to be written by the developer to a persistent API. a) 94. 95. 96. 97. Bean-Managed entity bean. [0.5] persistent b) Container-Managed persistent entity bean. _____________________ beans have a higher level of reuse. a) Session beans c) Stateful session beans b) Entity beans d) Stateless session beans What is known as instance pooling. [1.0] [1.5] a) The instantiation, destroying b) and reuse of a bean by the EJB container. If the bean is not required after use, then the container destroys it. b) If a requested bean has to be d) created, then the container does the instantiation. All of the above. A ____________ is a group of operations, which appear as one large [1.0] operation during execution. a) Transaction c) Task b) State d) Process At the time of creation, beans are written as ______________ [1.0] components, while during deployment they are ___________ components. a) Distributed/individual c) Networked/single b) Separate/distributed d) Whole/networked. 98. The bean class is different from a Java class. a) True 99. b) [0.5] False The implementation of a session bean is the same as an entity bean. [1.5] Do you agree with this statement? Select the correct reason to support your answer. a) Yes – because both are types c) Yes – because the of enterprise javabeans. 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, [1.5] when the ________________________ as per the EJB specification are implemented. a) Components c) Interfaces b) Containers d) Objects 101. The statement javax.ejb.Enterprisebean java.io.Serializable signifies:a) The bean class is confirmed. extends [1.5] c) None of the above b) The enterprise beans can d) Both a and b share all the properties of the serializable objects. 102. What takes place when a client invokes a method on a bean? a) The bean is directly invoked. c) The EJB container delegates [1.5]