Chapter 2
An Introduction to the Java 2
Platform, Enterprise Edition
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Overview of the J2EE Platform
• Enterprise concern:
- Related to solution’s properties :
- System attributes such as performance, scalability,
reliability, maintanability, security, ease of
incorporating new functionality, and the ability to
integrate the system with existing system
- Not directly related to solution’s properties :
- Product quality, time to market, cost of development,
team productivity, dependence on unique or hard-tofind skills, and dependenceon a single technology or
vendor
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Overview of the J2EE Platform
• Business concern:
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Implement business processes that contain a rich
representation of domain concepts, such as a simple
order-processing system must keep track of products,
customers, orders, inventory, and so on.
Collect and process large amounts of structured
information
Perform complex data manipulation and manage
complex interactions with its many concurrent users.
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Overview of the J2EE Platform
• Integration concern:
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Fundamental aspect of many enterprise system is their
integration with other system
Enterprise systems often run on complex and
distributed technical infrastructures
enterprise system may have been implemented at
different time and may use different technologies.
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Overview of the J2EE Platform
• Development concern:
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Development and maintenance of enterprise systems
is logistically complex
Enterprise system must keep pace with changing
business conditions
Enterprise systems are developed over long periods of
time (sometime decades), even though an initial
version of the system may be made available quickly
to address time-to-market concerns.
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Multitier Architectures and the J2EE Platform
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Platform Overview
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Technology Overview
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE application Component Technology
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Applets
An applet is primarily used to provide some form of
rendering in the user interface, where performance is key
Application clients
An application client is a standalone Java application that
provides an alternate means of accesing a J2EE application
Java Servlets
A servlet defines how a request from the client is processed
and how a response is generated
Java server Pages (JPSs)
A JSP is a text document that, like a servlet, describes how
a request is processed and a response generated.
Enterprise JavaBeans (EJBs)
An EJB is responsible for implementing an aspect of the
business logic of a J2EE application
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Services
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Java API for XML Parsing (JAXP)
JAXP provides a standard service that supports the parsing
and manipulation of XML document
Java DataBase Connectivity (JDBC)
JDBC provides programmatic access to a relational
database
Java Message Service (JMS)
JMS provides a standard interface to reliable asynchronous
messaging implementations
Java Authentication and Authorization Service (JAAS)
JAAS allows J2EE applications to authenticate users and
authorize users
Java Transaction API (JTA)
JTA provides a standard interface to the transaction
services
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Services
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•
Java Mail API
The JavaMail API allows application components to send
mail using a standard interface
J2EE Connector Architecture (JCA)
JCA provides a standard means for providing resource
adapters
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2SE Services
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Hypertext Transfer Protocol (HTTP) API
The HTTP API is a client-side API that supports interaction
with server-side presentation tier elements using HTTP, the
standard protocol for communication on the Web.
HTTPS API
HTTPS is the use of HTTP over the Secure Socket Layer
(SSL).
Remote Method Invocation over Internet Inter-Orb
Protocol (RMI-IIOP)
Java Naming and Directory Interface (JNDI)
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Containers
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The concept of a container is central to the J2EE platform
•
A container provides runtime support for application
components (such as JSPs, servlets, or EJBs) that execute
within it.
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Deployment Configurations
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Standalone Deployment Configuration
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EJB-Centric Deployment Configuration
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Web-Centric Deployment Configuration
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Multitier Deployment Configuration
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Standalone Deployment Configuration
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
EJB-Centric Deployment Configuration
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Web-Centric Deployment Configuration
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Multitier Deployment Configuration
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Component Technologies
•
•
Applets
A Java applet is a java program that executes within an
applet container that is conained within a client device,
such as a Web browser.
An applet is specified using the OBJECT tag in HTML, as
shown in the code fragment below :
<html>
<body>
<object codetype= “application/java” code=
“TestApplet class”, width=300 height=100>
….
</object>
<\body>
<\html>
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Component Technologies
•
Application Clients
An application client is a standalone Java application that
can contain presentation logic, business logic, and
integration logic
•
Java Servlets
A servlet is a Java class that is used to implement
presentation logic on the server.
•
Java Server Pages (JSP)
A JSP is a text document that, like a servlet, describes how
a request is processed and a response is generated.
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Java Server Pages (JSP)
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Enterprise Java Beans (EJB)
Exposing Home and Remote Interfaces
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Enterprise Java Beans (EJB)
Exposing Local Home and Local Interface
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Component Technologies
•
Enterprise JavaBeans (EJB)
Enterprise JavaBeans (EJPs) reside in the business tier and
are typically responsible for implementing the business
logic of J2EE applications.
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Home Interface
The home interface of an EJB declares operations that
pertain to the management of the elements represented by
the EJB.
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Remote Interface
The remote interface of an EJB declares business
operations supported by the EJB
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Component Technologies
•
Bean Class
A code fragment of the bean class for the UserAccount
EJB (irrespective of whether it supports remote or local
interfaces)
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There are three distict “flavors” of EJBs : session beans,
entity beans, and message-driven beans
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
Interactions Involving a Message-Driven Bean
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098
J2EE Module Overview
Source: Peter Eeles, Kelli Houston, and Wojtek Kozaczynsky, Building J2EE Applicationa with the Rational
Unified Process, Addison Wesley, 2003
Prepared by Agus Widodo D2098