1. Copyright © 2002 ProsoftTraining. All rights reserved. Enterprise JavaBeans

2. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 1: Introduction to Server-Side Component Software

3. Objectives Define client-server and multi-tier architecture Discuss the benefits and issues of distributed architectures Define software components Discuss server-side component architecture and architecture solutions Define J2EE technologies Define EJB technology

4. Client-Server and Multi-Tiered Architectures Scalability Extensibility Security Issues concerning distributed architectures –Complexity –Communication/bandwidth –Maintenance costs

5. Centralized Mainframe Architecture

6. Two-Tier Architecture

7. Three-Tier Architecture

8. Software Components Component architectures –Component development tools –Container –Maintenance deployment tools

9. Component Architecture Solutions.NET Enterprise Architecture CORBA J2EE

10. J2EE Technologies EJB RMI/RMI-IIOP JNDI JDBC JTA/JTS JMS JSP IDL JavaMail Connectors XML

11. Enterprise JavaBeans Differences between JavaBeans and Enterprise JavaBeans EJB development tasks –J2EE product provider –Bean developer –Application assembler –Deployer –System administrator –Tool provider

12. Summary Define client-server and multi-tier architecture Discuss the benefits and issues of distributed architectures Define software components Discuss server-side component architecture and architecture solutions Define J2EE technologies Define EJB technology

13. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 2: Overview of the Enterprise JavaBeans Framework

14. Objectives Define an EJB server’s main components Discuss EJB and client interaction Identify EJB container services Describe home objects and EJB objects Compare session beans and entity beans Define a deployment descriptor Identify the EJB-JAR file

15. EJB Architecture Primary components –EJB-compliant server –EJB-compliant container –Home object (bean factory) –EJB object (remote interface) –EJB

16. Example of EJB Architecture

17. Client Interaction with Enterprise JavaBeans

18. EJB Container Services Distributed transaction management Persistence Security Component resource and life cycle management Remote accessibility Transparent location of components Identification of components

19. The EJB Home Object Location transparency

20. The EJB Object Stubs Skeletons

21. Types of Enterprise JavaBeans Session beans –Stateful –Stateless Entity beans

22. Deployment Descriptors An XML document that describes the properties of an EJB

23. The EJB-JAR File Contains the class files for a bean, its home and remote interfaces, and the deployment descriptors

24. Summary Define an EJB server’s main components Discuss EJB and client interaction Identify EJB container services Describe home objects and EJB objects Compare session beans and entity beans Define a deployment descriptor Identify the EJB-JAR file

25. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 3: Creating Session Beans

26. Objectives Define the methods of the SessionBean interface Describe the EJBContext and the SessionContext interfaces Contrast stateful and stateless session beans Explain how to write business methods for a session bean Discuss the enterprise bean’s life cycle

27. Objectives (cont’d) Create a session bean Define the EJBHome and EJBObject interfaces and their methods Discuss the superclass for the home and remote interfaces Describe system and application exceptions Deploy and connect to a session bean

28. Creating the Enterprise Bean Class ejbCreate methods The SessionBean interface The EJBContext interface The SessionContext interface

29. Stateless and Stateful Session Beans Stateless session beans –Do not keep track of any information from one method call to the next Stateful session beans –Can change their state during a conversation with a client

30. Writing Business Methods for an Enterprise Bean Each EJB must declare the business methods that define the work that the EJB is designed to perform

31. The Home Interface Extends EJBHome Provides mechanisms to create and remove EJB components

32. The EJB Object Extends the EJBObject interface

33. Exceptions in EJB System exceptions Application exceptions

34. Example: A Session Bean The Teller bean class The Teller remote interface The Teller home interface

35. The Library Application The Book entity bean The Patron entity bean The CheckOutRecord entity bean The CheckOut session bean The CheckIn session bean

36. LibraryDB Schema

37. Introduction to EJB Deployment The deployment descriptor –DD XML tags Environment data –Environment property XML tags –Accessing environment data Using bean references –EJB reference XML tags –Using the EJB reference Using resource factories –Factory resource XML tags

38. Additional Deployment Concepts Assembler/deployer roles with the deployment descriptor EJB deployment in an EJB server

39. Summary Define the methods of the SessionBean interface Describe the EJBContext and the SessionContext interfaces Contrast stateful and stateless session beans Explain how to write business methods for a session bean Discuss the enterprise bean’s life cycle

40. Summary (cont’d) Create a session bean Define the EJBHome and EJBObject interfaces and their methods Discuss the superclass for the home and remote interfaces Describe system and application exceptions Deploy and connect to a session bean

41. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 4: Entity Beans

42. Objectives Discuss entity beans and their persistence management techniques Identify the methods of the EntityBean and EntityContext interfaces Define primary keys and their use Describe the mechanics involved in entity beans Use finder methods Write an entity bean and its required interfaces

43. What Is an Entity Bean? The EntityBean interface The EntityContext interface Primary keys

44. Entity Bean Architecture Creating entity beans Invoking business methods on entity beans Swapping entity beans Invoking remove( ) on an entity bean Life cycle of an entity bean instance

45. Life Cycle of an Entity Bean Instance

46. Bean-Managed Persistence Using JDBC Using a resource factory to connect to a database

47. Using Resource Factories

48. Entity Bean Methods The ejbCreate( ) method The ejbPostCreate( ) method The ejbRemove( ) method The ejbLoad( ) method The ejbStore( ) method

49. Using Finder Methods The ejbFindByPrimaryKey( ) method Multiple row finders

50. The Remote Interface All remote interfaces extend javax.ejb.EJBObject

51. The Home Interface The Account entity bean

52. Summary Discuss entity beans and their persistence management techniques Identify the methods of the EntityBean and EntityContext interfaces Define primary keys and their use Describe the mechanics involved in entity beans Use finder methods Write an entity bean and its required interfaces

53. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 5: Enterprise JavaBeans Clients

54. Objectives Use JNDI to obtain a reference to the home object Instantiate an EJB instance using the home object Call an enterprise bean's business methods Remove an enterprise bean Write an EJB client

55. Using JNDI

56. Creating an EJB Instance Invocation of business methods

57. Summary Use JNDI to obtain a reference to the home object Instantiate an EJB instance using the home object Call an enterprise bean's business methods Remove an enterprise bean Write an EJB client

58. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 6: Container-Managed Persistence

59. Objectives Discuss entity beans and CMP Explain the benefits and disadvantages of using CMP Describe the primary key as it relates to CMP Define an ejbCreate() method that uses CMP Write the requisite methods for an entity bean to use CMP

60. Introduction to Container- Managed Persistence (CMP) Benefits –Less code needed –Optimization techniques –More portable –Fewer bugs Disadvantages –Less flexibility –Inaccessible code

61. The Primary Key Primary key class –Must be serializable –Must be of a legal value type in RMI-IIOP

62. EJB Methods and CMP ejbCreate() ejbRemove() ejbLoad() ejbStore() Other methods Finder methods

63. The Deployment Descriptor EJB requirements DD XML tags

64. The Deployment Descriptor and CMP Example: A CMP entity bean –The EmployeeEJB bean class –The home interface –The remote interface

65. Summary Discuss entity beans and CMP Explain the benefits and disadvantages of using CMP Describe the primary key as it relates to CMP Define an ejbCreate() method that uses CMP Write the requisite methods for an entity bean to use CMP

66. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 7: Transactions in Enterprise JavaBeans

67. Objectives Define transactions and explain their use Distinguish transaction participants Define transaction properties Explain the EJB transactional model Describe distributed transactions Define transaction isolation levels Discuss EJB transaction attributes

68. What Are Transactions? Operations or series of operations that are treated as single units of work Transactional management

69. Participants in Transactions Transactional objects or applications Transaction managers Resources Resource managers

70. Properties of Transactions Atomicity Consistency Isolation Durability

71. EJB Transactional Models Flat transactional model Nested transactional model

72. Flat Transactional Model

73. Nested Transactional Model

74. Distributed Transactions Two-phase commits Transparent transaction control –Transaction context

75. Isolation Levels Strict –Each concurrent transaction is isolated from all other transactions Nonstrict –Increased transactional performance –Possibility of corrupted data

76. Transactions in EJB Transaction demarcation Container-managed transactions –Attributes Defining CMT in the DD Setting CMT in Deploytool

77. Container-Managed Transactions Container-managed transaction attributes Which methods require transaction attributes? The setRollbackOnly( ) and getRollbackOnly( ) methods Defining CMT in the DD Setting CMT in Deploytool

78. Bean-Managed Transactions UserTransaction interface –Properties –Methods Setting BMT in the DD BMT and stateful session beans BMT and stateless session beans

79. Summary Define transactions and explain their use Distinguish transaction participants Define transaction properties Explain the EJB transactional model Describe distributed transactions Define transaction isolation levels Discuss EJB transaction attributes

80. Copyright © 2002 ProsoftTraining. All rights reserved. Lesson 8: Enterprise JavaBeans Security

81. Objectives Define users in EJB security Discuss principals in EJB security Identify roles in EJB security Describe the DD’s role in EJB security Explain the EJB container’s role in EJB security

82. Defining Users, Principals and Roles Overview of EJB security –Authentication –Authorization Authorization in EJB code

83. Example: Users, Principals and Roles

84. Security and the Deployment Descriptor The bean developer and the DD The application assembler and the DD The deployer and the DD

85. Summary Define users in EJB security Discuss principals in EJB security Identify roles in EJB security Describe the DD’s role in EJB security Explain the EJB container’s role in EJB security

86. Enterprise JavaBeans Introduction to Server-Side Component Software Overview of the Enterprise JavaBeans Framework Creating Session Beans Entity Beans

87. Enterprise JavaBeans Enterprise JavaBeans Clients Container-Managed Persistence Transactions in Enterprise JavaBeans Enterprise JavaBeans Security