Introduction to J 2 EE Welcome Introduction to

Introduction to J 2 EE Welcome! Introduction to Java 2 Enterprise Edition Presented by Communication & Collaboration Technologies Division of the Chief Information Officer Rensselaer Polytechnic Institute 1

Introduction to J 2 EE Main Topics • Introduction – The Goal – The Problem – The Solution • What is J 2 EE? • The J 2 EE Framework • Case Studies / Examples 2

Introduction to J 2 EE 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. 3

Introduction to J 2 EE Introduction IT must provide: • High quality services – Highly Available – Secure – Scalable • Powerful services – Useful – Flexible – Extensible • Affordable 4

Introduction to J 2 EE The Problem Difficult Tasks! Complex software is expensive to: • • • produce purchase support maintain replace 5

Introduction to J 2 EE 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 6 ?

Introduction to J 2 EE 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 7

Introduction to J 2 EE What is J 2 EE? 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. 8

Introduction to J 2 EE What is J 2 EE? J 2 EE Provides: • Enabling technology • Standards based application model • A common architecture that provides key common functionality: – Security – Session Management – Scalability 9

Introduction to J 2 EE What is J 2 EE? What does "multi-tier" mean? • Applications architecture • Partitioning of application logic • Improves maintainability • Simplifies software upgrades and management 10

Introduction to J 2 EE What is J 2 EE? 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 11

Introduction to J 2 EE Some History Two tier application ("thin client") * client server • Easy to upgrade client • Expensive to scale and to add functionality *Business Logic 12

Introduction to J 2 EE Some History Two tier application ("client/server") client server • Strong scalability • Poor upgradability and difficult management 13

Introduction to J 2 EE Today Three tier application client app server • Thin clients make easy upgrades • Centralized application server management is easier to manage • Model allows for horizontal scalability 14

Introduction to J 2 EE Today Three tier application client app server • Thin clients make easy upgrades • Centralized application server management is easier to manage • Model allows for horizontal scalability 15

Introduction to J 2 EE Today 16

Introduction to J 2 EE Today N-tier application • View application server as a data store • Leverage data abstraction 17

Introduction to J 2 EE N-Tier Application 18

Introduction to J 2 EE N-Tier Application Banner LDAP 19

Introduction to J 2 EE N-Tier Application 20

Introduction to J 2 EE N-Tier Application 21

Introduction to J 2 EE N-Tier Application 22

Introduction to J 2 EE N-Tier Complexity 23

Introduction to J 2 EE Business Logic 24

Introduction to J 2 EE data O U T P U T Business Logic P R O C E S S 25 I N P U T data

Introduction to J 2 EE N-Tier Complexity 26

Introduction to J 2 EE N-Tier Complexity 27

Introduction to J 2 EE N-Tier Complexity 28

Introduction to J 2 EE N-Tier Complexity 29

Introduction to J 2 EE N-Tier Complexity 30

Introduction to J 2 EE N-Tier Complexity 31

Introduction to J 2 EE Servlets JSP/XML/XSLT J 2 EE Session Beans 32 Entity Beans

Introduction to J 2 EE Servlets JSP/XML/XSLT J 2 EE Session Beans 33 Entity Beans

Introduction to J 2 EE Example: The Kiosk 34

Introduction to J 2 EE Servlets JSP/XML/XSLT Example: The Kiosk Session Beans Entity Beans article client view get article restore category admin view utility 35

Introduction to J 2 EE Clones http: //j 2 ee. rpi. edu/helpdesk http: //j 2 ee. rpi. edu/kiosk http: //www. va. rpi. edu http: //www. eng. rpi. edu/frame_news. html 36

Introduction to J 2 EE The J 2 EE Framework Java Technologies External Application 37