Outline

1. Introduction
2. Architecture
3. Components
4. J2EE and E-Business

Introduction

J2EE technology provides:

• component-based approach to design, development, assembly and deployment of enterprise application. 
• multi-tier and distributed application model
• the ability to reuse components
• unified security model
• flexible transaction control

Introduction (cont.)

• Client tier components run on the client machine
• Web tier components run on the J2EE server
• Business tier components run on the J2EE server
• Enterprise data tier software runs on the database server

J2EE Architecture

J2EE Components

• Application clients and applets are client components.
• Java Servlet and JavaServer Pages (JSP) technology components are web components.
• Enterprise JavaBeans (EJB) components (enterprise beans) are business components.

J2EE Components (cont.)

Client component: 

• web-based : using browser
• non-web-based : client app, thin client
• applet

Web component:

• JSP : generate dynamic contents
• Servlet : processing request & providing response

Business component:

• Session beans: handling user sessions
• Entity beans: deal with database
• Message-driven beans: asynchronous communication

J2EE Components (cont.)

J2EE and E-Business Challenges

• Cost and complexity
• Solution: Leverage reusable software components

• Limited scope and impact
• Solution: Provide interfaces that enable enterprise-wide application development

• Diverse standards
• Solution: Utilize existing standards and software components

J2EE and E-Business Challenges

• Applications architecture
• Partitioning of application logic
• Improves maintainability
• Simplifies software upgrades and management
• Enables increased aggregate functionality
• Reduces component maintenance cost
• Separation of workload to improve scalability and reliability
• Strong separation prevents vendor lock-in

J2EE and E-Business Challenges

Thank You!

References:

https://docs.oracle.com/cd/B14099_19/core.1012/b13994/webstapp.htm

http://pawlan.com/monica/articles/j2eearch/

https://www.rpi.edu/dept/cct/public/j2ee/J2eeIntro.ppt