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Subject: Tutorial for building J2EE Applications using JBOSS and ECLIPSE
Date: Sun, 5 Dec 2004 11:56:23 +0800
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<H2 align=3Dcenter>Tutorial for building J2EE Applications using JBOSS =
and ECLIPSE=20
<IMG height=3D2 =
src=3D"http://www.tusc.com.au/tutorial/images/redrulr5.gif"=20
width=3D775 align=3Dmiddle border=3D0 name=3DGraphic1></H2>
<P><BR><BR></P>
<H1>Chapter 4. </H1>
<P><IMG height=3D2 =
src=3D"http://www.tusc.com.au/tutorial/images/blurulr6.gif"=20
width=3D785 align=3Dmiddle border=3D0 name=3DGraphic2></P>
<H2>Creating a Stateful Session Bean</H2>
<P align=3Dleft>This chapter covers how to create a stateful session EJB =

component. Unlike stateless beans, stateful bean instances are =
associated with a=20
particular client session and can therefore maintain information useful =
during=20
the lifetime of that session. A classic and familiar example of this in =
a web=20
e-commerce context is that of a shopping cart.</P>
<P align=3Dleft>We'll try something a little less ambitious for the time =
being!=20
This bean is similar to the StoreAccess Bean created in the previous =
chapter=20
except that it will store the userID of the client, after authentication =
is=20
successful. </P>
<P><IMG height=3D92=20
src=3D"http://www.tusc.com.au/tutorial/images/chap4/StoreAccessState.png"=
=20
width=3D439 align=3Dleft border=3D0 name=3DGraphic21><BR =
clear=3Dleft><BR><BR></P>
<P><FONT color=3D#800000><I>Note : This bean will not be used further in =
tutorial,=20
as this chapter demonstrates how stateful beans are created. =
</I></FONT></P>
<H3>Tasks :</H3>
<OL>
  <LI>
  <P>Create a Stateful Session Bean named StoreAccessState.</P>
  <LI>
  <P>Add a business method in the bean named loginUser with the =
signature</P>
  <P><B>public String loginUser (String username, String =
password)</B></P>
  <LI>
  <P>Add a call back method ejbCreate with the signature</P>
  <P><B>public void ejbCreate (String userID)</B></P>
  <LI>
  <P>Generate the DAO interface.</P>
  <LI>
  <P>Access the DAO named StoreAccesDAOImpl under package =
au.com.tusc.dao,=20
  created and implemented in the previous chapter. This DAO has a method =
named=20
  loginUser, called by loginUser in the bean with the signature </P>
  <P><B>public String loginUser (String username, String =
password)</B></P>
  <LI>
  <P>Deploy the StoreAccessState bean.</P>
  <LI>
  <P>Create your test client named SessionStateClient under package=20
  au.com.tusc.client.</P>
  <LI>
  <P>Run your client and test the bean.</P></LI></OL>
<H3><BR><BR></H3>
<H3><B>Create Stateless Bean :</B></H3>
<P style=3D"MARGIN-BOTTOM: 0in"><BR></P>
<P><B>Go To Package Explorer &gt; Expand Mystore (project) node &gt; =
select src,=20
right click and a menu will pop up.</B></P>
<P><B>On pop up menu &gt; New &gt; Lomboz EJB Creation Wizard.</B></P>
<P><B>Enter the package name au.com.tusc.sessionState, bean name=20
StoreAccessState and select bean type as stateful &gt; Finish.</B></P>
<P><B>This will create package named au.com.tusc.sessionState under src =
and=20
StoreAccessStateBean under that package as shown below.</B></P>
<P align=3Dleft><IMG height=3D218=20
src=3D"http://www.tusc.com.au/tutorial/images/chap4/StaoreAccessState.png=
"=20
width=3D570 align=3Dleft border=3D0 name=3DGraphic43><BR =
clear=3Dleft><B>As we can see=20
from the figure above it has created a class level tag @ejb.bean, which =
has=20
assigned the bean type, name and its JNDI name which will be generated =
in the=20
Home interface. This tag will also generate deployment descriptors in=20
ejb-jar.xml and jboss.xml file as well once you generate your EJB =
classes, which=20
is covered later on in this chapter</B>.</P>
<P align=3Dleft><FONT color=3D#800000><I>Note: It will generate the bean =
name,=20
jndi-name and type of bean in file. Also, the name of file is appended =
with word=20
'Bean' as you gave the name of the bean as StoreAccess only. So be =
careful with=20
your naming convention, as you only need specify the bean name in the =
wizard=20
(ie. without a 'Bean' suffix as the wizard will append that for you).=20
</I></FONT></P>
<P><IMG height=3D514=20
src=3D"http://www.tusc.com.au/tutorial/images/chap3/SessionBeanGeneartedD=
escView.png"=20
width=3D311 align=3Dleft border=3D0 name=3DGraphic3><BR =
clear=3Dleft><BR><BR></P>
<H3 style=3D"MARGIN-TOP: 0in; MARGIN-BOTTOM: 0in"><B>Create DAO =
Interface=20
:</B></H3>
<P style=3D"MARGIN-BOTTOM: 0in"><BR></P>
<P>Since we are going to use a DAO to access the database for this =
Stateful=20
Bean, we will use the StoreAccesDAOImpl class which was created and =
implemented=20
in the previous chapter. This will provide the implementation for the =
generated=20
DAO interface.</P>
<P><B>Now go to your Bean class and declare this tag at class level =
(i:e; at=20
top), as described below to generate the DAO =
interface.</B></P><PRE><FONT color=3D#3f5fbf>   <FONT size=3D3><FONT =
face=3DSans>@ejb.dao =
class=3D"au.com.tusc.sessionState.StoreAccessStateDAO"</FONT></FONT></FON=
T>
<FONT color=3D#3f5fbf>    <FONT size=3D3><FONT =
face=3DSans>impl-class=3D"au.com.tusc.dao.StoreAccessDAOImpl"</FONT></FON=
T></FONT></PRE>
<P style=3D"MARGIN-BOTTOM: 0in"><IMG height=3D296=20
src=3D"http://www.tusc.com.au/tutorial/images/chap4/StoreAccessStateDAOIm=
pl.png"=20
width=3D812 align=3Dleft border=3D0 name=3DGraphic5><BR =
clear=3Dleft><BR></P>
<P style=3D"MARGIN-BOTTOM: 0in"><B>Expand the StoreAccessStateBean node =
under=20
Package Explorer. Right click and a pop up menu will appear. </B></P>
<P><B>On that menu go to Lomboz J2EE &gt; Add EJB to module. Select EJB=20
MyStoreMgr &gt; OK.</B></P>
<P style=3D"MARGIN-BOTTOM: 0in"><FONT color=3D#800000><I>Note : This =
step is covered=20
in previous chapter.</I></FONT></P>
<P style=3D"MARGIN-BOTTOM: 0in"><BR></P>
<P style=3D"MARGIN-BOTTOM: 0in"><B>Expand MyStoreMgr node under MyStore =
Project in=20
Package Explorer. Right click and a pop up menu will appear.</B></P>
<P style=3D"MARGIN-BOTTOM: 0in"><B>Go to Lomboz J2EE &gt; Generate EJB =
Classes as=20
shown in figure at right.</B></P>
<P style=3D"MARGIN-BOTTOM: 0in"><IMG height=3D432=20
src=3D"http://www.tusc.com.au/tutorial/images/chap3/GenerateEJBClassesNow=
.png"=20
width=3D474 align=3Dleft border=3D0 name=3DGraphic44><BR =
clear=3Dleft><BR></P>
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