J2ee Intro

Introduction to J2EE

Welcome!

Introduction to Java 2 Enterprise Edition Presented by Lalith t GMIT

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Introduction to J2EE

Main Topics

• Introduction – The Goal – The Problem – The Solution

• What is J2EE? • The J2EE Framework • Case Studies / Examples

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Introduction to J2EE

Introduction

“Enterprises today need to extend their reach, reduce their costs, and lower their response times” – Simplified Guide to the Java 2 Platform, Enterprise Edition, Sun Microsystems, Inc.

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Introduction to J2EE

Introduction

IT must provide: • High quality services – Highly Available – Secure – Scalable

• Powerful services – Useful – Flexible – Extensible

• Affordable

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Introduction to J2EE

The Problem

Difficult Tasks! Complex software is expensive to:

• • • • •

produce purchase support maintain replace 5

Introduction to J2EE

The Problem

Why not delegate components to different departments? Departmental solutions are: • Limited in scope – Difficult to be aware of enterprisewide requirements and initiatives

• Difficult to leverage – Diverse interoperabilty standards

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?

Introduction to J2EE

The Solution

• 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

• Strength: Leveraged departmental core compentencies – Strongly defined roles and software interfaces allow maximum collaboration

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Introduction to J2EE

What is J2EE?

What is Java 2 Enterprise Edition? "The Java 2 platform, Enterprise Edition reduces the cost and complexity of developing ... multi-tier services, resulting in services that can be rapidly deployed and easily enhanced“ – Simplified Guide to the Java 2 Platform, Enterprise Edition, Sun Microsystems, Inc.

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Introduction to J2EE

What is J2EE?

J2EE Provides: • Enabling technology • Standards based application model • A common architecture that provides key common functionality: – Security – Session Management – Scalability

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Introduction to J2EE

What is J2EE?

What does "multi-tier" mean? • Applications architecture • Partitioning of application logic • Improves maintainability • Simplifies software upgrades and management

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Introduction to J2EE

What is J2EE?

What does "multi-tier" mean? • Enables increased aggregate functionality • Reduces component maintenance cost • Separation of workload to improve scalability and reliability • Strong separation prevents vendor lock-in

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Introduction to J2EE

Some History

Two tier application ("thin client")

*

client

server

• Easy to upgrade client • Expensive to scale and to add functionality *Business *Business Logic Logic

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Introduction to J2EE

Some History

Two tier application ("client/server")

client

server

• Strong scalability • Poor upgradability and difficult management 13

Introduction to J2EE

Today

Three tier application

client

app server

server

• Thin clients make easy upgrades • Centralized application server management is easier to manage • Model allows for horizontal scalability 14

Introduction to J2EE

Today

Three tier application

client

app server

server

• Thin clients make easy upgrades • Centralized application server management is easier to manage • Model allows for horizontal scalability 15

Introduction to J2EE

Today

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Introduction to J2EE

Today

N-tier application

• View application server as a data store • Leverage data abstraction 17

Introduction to J2EE

N-Tier Application

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Introduction to J2EE

N-Tier Application

Banner

LDAP

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Introduction to J2EE

N-Tier Application

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Introduction to J2EE

N-Tier Application

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Introduction to J2EE

N-Tier Application

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Introduction to J2EE

N-Tier Complexity

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Introduction to J2EE

Business Logic

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Introduction to J2EE

data data

O U T P U T

Business Logic

P R O C E S S

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I N P U T

data data

Introduction to J2EE

N-Tier Complexity

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Introduction to J2EE

N-Tier Complexity

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Introduction to J2EE

N-Tier Complexity

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Introduction to J2EE

N-Tier Complexity

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Introduction to J2EE

N-Tier Complexity

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Introduction to J2EE

N-Tier Complexity

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Introduction to J2EE

Servlets JSP/XML/XSLT

J2EE

Session Beans

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Entity Beans

Introduction to J2EE

Servlets JSP/XML/XSLT

J2EE

Session Beans

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Entity Beans

Introduction to J2EE

Example: The Kiosk

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Introduction to J2EE

Servlets JSP/XML/XSLT

Example: The Kiosk

Session Beans

Entity Beans

article article

client view

get get article article restore restore

category category

admin view utility

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Introduction to J2EE

Clones

http://j2ee.rpi.edu/helpdesk

http://j2ee.rpi.edu/kiosk http://www.va.rpi.edu

http://www.eng.rpi.edu/frame_news.html

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Introduction to J2EE

The J2EE Framework

Java Technologies

External Application

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