1. Enterprise JavaBeans

2. 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. 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 EJBs

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. Lesson 3: Creating a Session Bean

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 EJB life cycle

27. Objectives (cont’d)  Create a session bean  Define the EJBHome and EJBObjects 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 EJB  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. 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 EJB life cycle

38. Summary (cont’d) Create a session bean Define the EJBHome and EJBObjects 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

39. Lesson 4: EJB Deployment

40. Objectives  Define a deployment descriptor  Add environment data to a DD  Describe how to reference resource factories in a DD  Explain assembly information in a DD  Use JNDI to access an EJB’s environment data  Describe the process of EJB deployment

41. The Deployment Descriptor  EJB requirements  DD XML tags

42. Environment Data  Environment property XML tags  Accessing environment data

43. Using JNDI

44. Using Bean References  EJB reference XML tags  Using the EJB reference

45. Using Resource Factories

46. EJB Deployment in an EJB Server  Deploying an application  Creating stub and skeleton classes

47. Summary Define a deployment descriptor Add environment data to a DD Describe how to reference resource factories in a DD Explain assembly information in a DD Use JNDI to access an EJB’s environment data Describe the process of EJB deployment

48. Lesson 5: EJB Clients

49. Objectives  Use JNDI to obtain a reference to the home object  Instantiate an EJB instance using the home object  Call an EJB’s business methods  Remove an EJB  Write an EJB client

50. Using JNDI  JDNI is an API - Used to access naming and directory services - Provides an interface to the RMI registry  JNDI InitialContext  Locating the home object

51. Creating an EJB Instance  Invocation of business methods

52. Summary Use JNDI to obtain a reference to the home object Instantiate an EJB instance using the home object Call an EJB’s business methods Remove an EJB Write an EJB client

53. Lesson 6: Entity EJBs

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

55. What Is an Entity Bean?  Object serialization  Object-relational mapping  Bean-managed persistence  Container-managed persistence  Primary keys

56. Entity Bean Architecture  Creating entity beans  Invoking business methods on entity beans  Swapping entity beans  Invoking remove() on an entity bean

57. Life Cycle of an Entity Bean Instance

58. Bean-Managed Persistence  BMP - SQL - JDBC

59. Entity Bean Methods ejbCreate() ejbPostCreate() ejbRemove() ejbLoad() ejbStore()

60. Using Finder Methods  ejbFindByPrimaryKey()  Multiple row finders

61. The Remote Interface and the Home Interface  Remote interface - Provides the interface for the client - Exposes methods for manipulating the entity bean  Home interface - Contains the create() and find…() methods for an entity bean

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

63. Lesson 7: Container-Managed Persistence

64. 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

65. Container-Managed Persistence  Benefits of CMP - Less code needed - Optimization techniques - More portable - Fewer bugs  Disadvantages of CMP - Less flexibility - Inaccessible code

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

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

68. The DD and CMP  Example: A CMP entity bean - The EmployeeEJB bean class - The home interface - The remote interface

69. 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

70. Lesson 8: Transactions

71. 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

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

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

74. EJB Transactional Model  Flat transactional model  Nested transactional model

75. Flat Transactional Model

76. Nested Transactional Model

77. Distributed Transactions  Two-phase commits  Transparent transaction control - Transaction context

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

79. Transactions in Enterprise JavaBeans  Transaction demarcation  Container-managed transactions - Attributes  Defining CMT in the DD  Setting CMT in Deploytool

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

81. 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

82. Lesson 9: EJB Security

83. 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

84. Defining Users, Principals and Roles  Overview of EJB security - Authentication - Authorization  Authorization in EJB code

85. Example: Users, Principals and Roles

86. Security and the DD  The bean developer and the DD  The application assembler and the DD  The deployer and the DD

87. 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

88. Enterprise JavaBeans Introduction to Server-Side Component Software Overview of the Enterprise JavaBeans Framework Creating a Session Bean EJB Deployment EJB Clients

89. Enterprise JavaBeans Entity EJBs Container-Managed Persistence Transactions EJB Security