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Subject: Tutorial for building J2EE Applications using JBOSS and ECLIPSE
Date: Thu, 16 Dec 2004 14:35:13 +0800
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<H2 align=3Dcenter>Tutorial for building J2EE Applications using JBOSS =
and ECLIPSE=20
<IMG height=3D2 =
src=3D"file:///F:/java_trainning/1206/tuscejb/3.files/redrulr5.gif"=20
width=3D775 align=3Dmiddle border=3D0 name=3DGraphic1></H2>
<P><BR><BR></P>
<H1>Chapter 3. </H1>
<P><IMG height=3D2=20
src=3D"file:///F:/java_trainning/1206/tuscejb/3.files/blurulr6.gif" =
width=3D785=20
align=3Dmiddle border=3D0 name=3DGraphic2></P>
<H2>Creating a Stateless Session Bean</H2>
<P>This chapter covers how to create a stateless session EJB component. =
This=20
bean will be responsible for authenticating the user by communicating =
with the=20
database using Data Access Object (DAO) which encapsulates Java Database =
Connectivity (JDBC) code. A DAO has all attributes (fields) and behavior =
(methods) corresponding to the bean it is being used for. </P>
<P><BR><BR></P>
<P><IMG height=3D86=20
src=3D"file:///F:/java_trainning/1206/tuscejb/3.files/J2EECaseStudyFlowDi=
agram.png"=20
width=3D607 align=3Dleft border=3D0 name=3DGraphic26><BR =
clear=3Dleft><BR><BR></P>
<P>All customers, supplier and manager of MyStore have been assigned a =
unique=20
username and userid to access services of MyStore, but in order to =
access these=20
services all these entities have to first login into the system =
(MyStore). The=20
method for authentication is named <B>loginUser</B>, which takes <B>two =
String=20
parameters, username and password and returns the userID if =
authentication is=20
successful. </B></P>
<P><FONT color=3D#800000><I>Note : This method loginUser is a business =
method,=20
normally business methods carry out operations or processing on values =
EJB=20
components. From clients perspective, clients can see only business =
methods and=20
invoke them on bean.</I></FONT></P>
<H3>Tasks :</H3>
<OL>
<LI>
<P>Create a J2EE project named MyStore.</P>
<LI>
<P>Create a Stateless Session Bean named StoreAccess.</P>
<LI>
<P>Add a business method in bean named loginUser with the following=20
signature</P>
<P><B>public String loginUser (String username, String =
password)</B></P>
<LI>
<P>Create a DAO named StoreAccessDAOImpl under package =
au.com.tusc.dao.=20
Generate the DAO interface.</P>
<LI>
<P>Implement the method named loginUser, generated in DAO interface, =
in=20
StoreAccessDAOImpl. Method signature is </P>
<P><B>public String loginUser (String username, String password) =
</B></P>
<LI>
<P>Add callback methods and implement them.</P>
<LI>
<P>Deploy StoreAccess bean.</P>
<LI>
<P>Create your test client named SessionClient under package=20
au.com.tusc.client.</P>
<LI>
<P>Run your client and test the bean.</P></LI></OL>
<H3><B>Create J2EE Project :</B></H3>
<P>Now, lets start to write our first component of this tutorial.</P>
<P><B>Go to File > New > LombozJ2EE Project, project creation =
wizard will=20
pop up.</B></P>
<P><B>Insert Project Name MyStore > Next .</B></P>
<P><B>Under Java Settings Check source, should be MyStore/src , =
libraries=20
pointing to $JAVA_HOME > Go Next as shown in fig below. </B></P>
<P align=3Dleft><FONT color=3D#800000><I>Note: This step is shown in =
chapter1, as=20
there is a bug in eclipse 2.1, so its important that you check your =
library=20
settings are right.</I></FONT></P>
<P><IMG height=3D527=20
src=3D"file:///F:/java_trainning/1206/tuscejb/3.files/CreateJ2eeProjectLi=
braries.png"=20
width=3D605 align=3Dleft border=3D0 name=3DGraphic53><BR =
clear=3Dleft><BR><BR></P>
<P><B>Under Create J2EE Module, select Web Modules tab > Add.., enter =
Module=20
name as OnlineStore > OK as shown in figure below.</B></P>
<P><IMG height=3D548=20
src=3D"file:///F:/java_trainning/1206/tuscejb/3.files/CreateJ2eeAddWebMod=
ule.png"=20
width=3D713 align=3Dleft border=3D0 name=3DGraphic52><BR =
clear=3Dleft><BR><BR></P>
<P><B>Under Create J2EE Module, select EJB Modules tab > Add.., enter =
Module=20
name as MyStoreMgr > OK .</B></P>
<P><B>Under Create J2EE Module, select Targeted Servers tab > Select =
JBOSS=20
3.2.1 ALL > Add.. > Finish.</B></P>
<P><BR><BR></P>
<H3 style=3D"MARGIN-TOP: 0in; MARGIN-BOTTOM: 0in"><B>Create Stateless =
Bean=20
:</B></H3>
<P style=3D"MARGIN-BOTTOM: 0in"><BR></P>
<P><B>Go To Package Explorer > Expand Mystore (project) node > =
select src,=20
right click and menu will pop up.</B></P>
<P><B>On pop up menu > New > Lomboz EJB Creation Wizard.</B></P>
<P><B>Enter package name au.com.tusc.session, bean name StoreAccess and =
select=20
bean type as stateless > Finish.</B></P>
<P><B>This will create a package named au.com.tusc.session under src and =
StoreAccessBean under that package as shown in the figure below.</B></P>
<P align=3Dleft><IMG height=3D489=20
src=3D"file:///F:/java_trainning/1206/tuscejb/3.files/SessionBeanView.png=
"=20
width=3D922 align=3Dleft border=3D0 name=3DGraphic54><BR =
clear=3Dleft><BR><BR></P>
<P align=3Dleft><B>As we can see from the figure below it has created a =
class=20
level tag @ejb.bean, which has assigned the bean type, name and its JNDI =
name=20
which will be generated in Home interface. This tag will also generate=20
deployment descriptors in ejb-jar.xml and jboss.xml file as well once =
you=20
generate your EJB classes, which is covered later on in this =
chapter.</B></P>
<P align=3Dleft><IMG height=3D195=20
src=3D"file:///F:/java_trainning/1206/tuscejb/3.files/StoreAccessBeanJndi=
Descp.png"=20
width=3D217 align=3Dleft border=3D0 name=3DGraphic43><BR =
clear=3Dleft><BR><BR></P>
<P><FONT color=3D#800000><I>Note: It will generate the bean name, =
jndi-name and=20
type of bean in the file. Also, the name of file is appended with word =
'Bean' as=20
you gave the name of the bean as StoreAccess only. Again, be careful =
with naming=20
conventions, specifying the bean name only in the wizard without adding =
the word=20
'Bean' to the name as the wizard appends that for you. </I></FONT></P>
<P><FONT color=3D#800000><I>Expand MyStoreMgr/META-INF node under =
Package=20
Explorer. You will find there are seven files which are generated by =
Lomboz=20
using Xdoclet as shown in the figure below. </I></FONT></P>
<P align=3Dleft><IMG height=3D514=20
src=3D"file:///F:/java_trainning/1206/tuscejb/3.files/SessionBeanGenearte=
dDescView.png"=20
width=3D311 align=3Dleft border=3D0 name=3DGraphic3><BR =
clear=3Dleft><BR><BR></P>
<P>Now we are going to generate all the interfaces including Home, =
Remote, DAO=20
and other helper classes. We will explain why later on, but for the time =
being=20
just follow the steps.</P>
<P>But before we get too excited, there are a few concepts to cover =
here.</P>
<P><B>Go to MyStoreMgr/META-INF > select and open =
ejbGenerate.xml.</B></P>
<P><FONT color=3D#800000><I>Note: Lomboz uses this file to generate =
required=20
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