intro to j2ee
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Introduction to J2EE
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Introduction to Java 2 Enterprise Edition
Presented by
Communication & Collaboration TechnologiesDivision of the Chief Information Officer
Rensselaer Polytechnic Institute
Welcome!
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Main Topics
• Introduction– The Goal– The Problem– The Solution
• What is J2EE?
• The J2EE Framework
• Case Studies / Examples
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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
IT must provide:
• High quality services– Highly Available– Secure– Scalable
• Powerful services– Useful– Flexible– Extensible
• Affordable
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The Problem
• produce • purchase• support• maintain• replace
Complex software is expensive to:
Difficult Tasks!
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?
The Problem
Why not delegate components to different departments?
Departmental solutions are:• Limited in scope
– Difficult to be aware of enterprise- wide requirements and initiatives
• Difficult to leverage– Diverse interoperabilty standards
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• 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
The Solution
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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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What is J2EE?
• Enabling technology• Standards based application model• A common architecture that provides
key common functionality:– Security– Session Management– Scalability
J2EE Provides:
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What is J2EE?
• Applications architecture• Partitioning of application logic• Improves maintainability• Simplifies software upgrades and
management
What does "multi-tier" mean?
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What is J2EE?
• Enables increased aggregate functionality• Reduces component maintenance cost• Separation of workload to improve
scalability and reliability• Strong separation prevents
vendor lock-in
What does "multi-tier" mean?
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Some History
Two tier application ("thin client")
• Easy to upgrade client• Expensive to scale and to add functionality
*Business Logic
serverclient
*
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Some History
Two tier application ("client/server")
• Strong scalability• Poor upgradability and difficult management
serverclient
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Today
Three tier application
• Thin clients make easy upgrades• Centralized application server management is
easier to manage• Model allows for horizontal scalability
client app server server
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Today
Three tier application
• Thin clients make easy upgrades• Centralized application server management is
easier to manage• Model allows for horizontal scalability
client app server server
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Today
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N-tier application
• View application server as a data store• Leverage data abstraction
Today
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N-Tier Application
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N-Tier Application
Banner
LDAP
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N-Tier Application
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N-Tier Application
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N-Tier Application
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N-Tier Complexity
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Business Logic
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Business Logic
data
PROCESS
OUTPUT
INPUT
data
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N-Tier Complexity
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N-Tier Complexity
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N-Tier Complexity
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N-Tier Complexity
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N-Tier Complexity
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N-Tier Complexity
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ServletsJSP/XML/XSLT
SessionBeans
EntityBeans
J2EE
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J2EE
ServletsJSP/XML/XSLT
SessionBeans
EntityBeans
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Example: The Kiosk
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Example: The Kiosk
ServletsJSP/XML/XSLT
SessionBeans
EntityBeans
article
category
get articleclient view
admin view
restore
utility
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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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The J2EE Framework
Java Technologies
ExternalApplication
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