Enterprise application developement

Enterprise Application
Development on using Java
Presentation by: Archana Jha
Submitted by: Ms. Rani Ojha

Past History
 Initially two tier architecture (client
server applications)
 Client is responsible for data access
applying business logic and
presentation of data
 Only service provided by Server was
that of database server.

Two Tier Application
Architecture
Client Server

Two Tier Application
Architecture
 Drawbacks
- Easy to deploy but difficult to enchance
or upgrade.
- It makes reuse of business and
presentation logic difficult
- Not scalable and not suited for internet

Java 2 Platform Enterprise
Edition(J2EE)
J2EE is an architecture for
implementing enterprise class
applications using Java and Internet
Technology
- Solves problems of two tier architecture

J2EE
 To develop n tier application
 It supports the development of a
variety of application types
 small client server systems
 Systems running on Intranets
 Systems on large scale internet e-
commerce site

J2EE Features
 Component based model
 Container provided services
 Highly Scaleable
 Simplified Architecture
 Flexible security model

Java: Foundation for J2EE
 J2EE is an application of java
 Write once and deploy the code into
any platform

J2EE Components & Services
 Primary technologies
- Servlets
- JavaServer Pages (JSP)
- Enterprise JavaBeans (EJB)
 Standard services & supporting technologies
- Java database connectivity(JDBC) data access API
- Remote Method Invocations (RMI)
- Extensible Markup Languages(XML)
- JavaIDL
- JavaMail

J2EE Tiers
 Client Presentation
 HTML or Java applets deployed in Browser
 XML documentations transmitted through
HTTP
 Java clients running in Client Java Virtual
Machine (JVM)
• Presentation Logic
 Servlets or JavaServer Pages running in
web server
• Application Logic
 Enterprise JavaBeans running in Server

J2EE Application Model
 Browser is able to process HTML and
applets pages.
 It forwards requests to the web server,
which has JSPs and Servlets
 Servlets and JSPs may access EJB
server.
 Java Standalone runs on java client,
which access EJB server using RMI.

Enterprise Java Beans (EJBs)
 Enterprise Java beans architecture is a component
model for development and deployment of
distributed business application.
 Entity Beans
 Represent persistent business Entity
 Persisted in storage system ( usually Database)
 Might contain Application logic intrinsic to entity
• Session Beans
 Perform work for individual clients on the server
 Encapsulate complex business logic
 Can coordinate transactional work on multiple entity
beans

Servlet Operation
 Server is Java program that runs as
separate thread inside servlet
container.
 Servlet container is part of web server
 It interact with web client using
response request paradigm

JavaServer Pages (JSP)
 Text based documents describe how to
process a request and create a
response
 Contains HTML or XML and other JSP
elements defined by JSP specification.
 Are Installed on web server
 are web components that sits on top of
java servlet mode.

JSP Advantages
 Performance
 Runtime characteristics of servlets
 Automatic recompilation of modified pages
 Server side processing
 Programming
 Emphasize use of reusable components
 Write Once , Run Anywhere properties
 Extensible through custom tag libraries
 Provides front end access mechanism to
EJBs

Enterprise application developement

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