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Subject: Tutorial for building J2EE Applications using JBOSS and ECLIPSE
Date: Sun, 5 Dec 2004 12:00:35 +0800
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<H2 align=3Dcenter>Tutorial for building J2EE Applications using JBOSS =
and ECLIPSE=20
<IMG height=3D2 =
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<P><BR><BR></P>
<H1>Chapter 2. </H1>
<P><IMG height=3D2 =
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<H2>Overview Of J2EE Technology and Concepts</H2>
<P>The Java 2 Enterprise Edition (J2EE) is a multitiered architecture =
for=20
implementing enterprise-class applications and web based applications. =
This=20
technology supports a variety of application types from large scale web=20
applications to small client server applications. The main aim of J2EE=20
technology is to create a simple development model for enterprise =
applications=20
using component based application model. In this model such components =
use=20
services provided by the container, which would otherwise typically need =
to be=20
incorporated in application code. Note this may not be ideal in all =
scenarios:=20
for example, a small scale application might be a better fit for a =
light-weight=20
Java technology solution (e.g. Servlets, JSPs, etc.). </P>
<H3>J2EE Components :</H3>
<P>J2EE applications are made up of different components. A J2EE =
component is a=20
self-contained functional software unit that is assembled into a J2EE=20
application with its helper classes and files and that communicates with =
other=20
components in the application. The J2EE specification defines the =
following J2EE=20
components:</P>
<P><B>Application clients and applets are components that run on the=20
client.</B></P>
<P><B>Java Servlet and JavaServer Pages technology components are Web =
components=20
that run on the web server.</B> </P>
<P><B>Enterprise JavaBeans components (enterprise beans) are business =
components=20
that run on the application server.</B></P>
<P><IMG height=3D397=20
src=3D"http://www.tusc.com.au/tutorial/images/chap2/J2EEMultitiredApplica=
tionDiagram.png"=20
width=3D683 align=3Dleft border=3D0 name=3DGraphic3><BR =
clear=3Dleft><BR><BR></P>
<P>All these J2EE components are assembled into a J2EE application, =
verified to=20
be well formed and in compliance with the J2EE specification, and =
deployed to=20
production, where they are run and managed by the J2EE application =
server. </P>
<P><B>In addition to these primary components, it includes standard =
services and=20
supporting technologies which are :</B></P>
<P><B>Java Database Connectivity (JDBC) technology provides access to =
relational=20
database systems.</B></P>
<P><B>Java Transaction API (JTA) or Java Transaction Service (JTS) =
provides=20
transaction support for J2EE components.</B></P>
<P><B>Java Messaging Service (JMS) for asynchronous communication =
between J2EE=20
components. </B></P>
<P><B>Java Naming and Directory Interface (JNDI) provides naming and =
directory=20
access.</B></P>
<P><FONT color=3D#800000><I>Note : All J2EE components are written in =
the Java=20
programming language</I></FONT></P>
<H3><BR><BR></H3>
<H3>J2EE Clients : </H3>
<P>There are normally two types of J2EE client: a Web client and an =
Application=20
client as shown above in figure.</P>
<P>A Web client consists of two parts, dynamic Web pages containing =
various=20
types of markup language (HTML, XML and others), which are generated by =
Web=20
components running in the Web tier, and a Web browser, which draws the =
pages=20
received from the server. Another category of web clients are sometimes =
called=20
as thin client. Thin clients usually do not do things like query =
databases,=20
execute complex business rules, or connect to any legacy applications. =
When we=20
use a thin client, heavyweight operations like these are handled by =
enterprise=20
beans executing on the J2EE server where they can leverage the security, =
speed,=20
services, and reliability of J2EE server-side technologies. </P>
<P>A Web page received from the Web tier can include an embedded applet. =
An=20
applet is a small client application written in the Java programming =
language=20
that executes in the Java virtual machine installed in the Web browser. =
However,=20
client systems will need the Java Plug-in and possibly a security policy =
file in=20
order to execute applets successfully in the Web browser. Web components =
are=20
often a preferred API for creating a Web client program because no =
plug-ins or=20
security policy files are needed on the client systems. Moreover this =
allows=20
cleaner and more modular application design because they provide a means =
to=20
separate application logic from Web page design.</P>
<P>An Application client runs on a client machine and provides a way for =
users=20
to handle tasks that require a richer user interface than can be =
provided by a=20
markup language. It normally has a graphical user interface (GUI) =
created using=20
the Swing or Abstract Window Toolkit (AWT) APIs. Application clients =
directly=20
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