1 / 87

Enterprise JavaBeans

Enterprise JavaBeans. Lesson 1: Introduction to Server-Side Component Software. Objectives. Define client-server and multi-tier architecture Discuss the benefits and issues of distributed architectures Define software components

Download Presentation

Enterprise JavaBeans

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript


  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 andMulti-Tiered Architectures • Scalability • Extensibility • Security • Issues concerning distributed architectures • Complexity • Communication/bandwidth • Maintenance costs

  5. CentralizedMainframe Architecture

  6. Two-TierArchitecture

  7. Three-TierArchitecture

  8. SoftwareComponents • Component architectures • Component development tools • Container • Maintenance deployment tools

  9. ComponentArchitecture Solutions • .NET Enterprise Architecture • CORBA • J2EE

  10. EJB RMI/RMI-IIOP JNDI JDBC JTA/JTS JMS JSP IDL JavaMail Connectors XML J2EETechnologies

  11. EnterpriseJavaBeans • 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. EJBArchitecture • Primary components • EJB-compliant server • EJB-compliant container • Home object (bean factory) • EJB object (remote interface) • EJB

  16. Example ofEJB Architecture

  17. Client Interactionwith Enterprise JavaBeans

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

  19. The EJBHome Object • Location transparency

  20. TheEJB Object Stubs Skeletons

  21. Types ofEnterprise JavaBeans • Session beans • Stateful • Stateless • Entity beans

  22. DeploymentDescriptors • An XML document that describes the properties of an EJB

  23. TheEJB-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 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 theEnterprise Bean Class • ejbCreate methods • The SessionBean interface • The EJBContext interface • The SessionContext interface

  29. Stateless andStateful 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 LibraryApplication • The Book entity bean • The Patron entity bean • The CheckOutRecord entity bean • The CheckOut session bean • The CheckIn session bean

  36. LibraryDBSchema

  37. Introduction toEJB 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. AdditionalDeployment 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. 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 BeanArchitecture • 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 anEntity Bean Instance

  46. Bean-ManagedPersistence • Using JDBC • Using a resource factory to connect to a database

  47. UsingResource Factories

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

  49. UsingFinder Methods • The ejbFindByPrimaryKey( ) method • Multiple row finders

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

More Related