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examples.ejb20.basic.statelessSession (WebLogic Server 8.1 Examples)
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<TD ALIGN="right" VALIGN="top" ROWSPAN=3><EM>
</td><td valign=bottom align=right><b>WebLogic Server 8.1 Code Examples</b>, BEA Systems, Inc.</td></EM>
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<H2>
Package examples.ejb20.basic.statelessSession
</H2>
This example is a package that demonstrates an
Enterprise JavaBean written to the EJB 2.0 specification.
<P>
<B>See:</B>
<BR>
<A HREF="#package_description"><B>Description</B></A>
<P>
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<TR BGCOLOR="#CCCCFF" CLASS="TableHeadingColor">
<TD COLSPAN=2><FONT SIZE="+2">
<B>Interface Summary</B></FONT></TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="Trader.html"><I>Trader</I></A></B></TD>
<TD>The methods in this interface are the public face of TraderBean.
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="TraderHome.html"><I>TraderHome</I></A></B></TD>
<TD>This interface is the home interface for the TraderBean.java,
which in WebLogic is implemented by the code-generated container
class TraderBeanC. </TD>
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<P>
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<TD COLSPAN=2><FONT SIZE="+2">
<B>Class Summary</B></FONT></TD>
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<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="Client.html">Client</A></B></TD>
<TD>This class illustrates calling a stateless Session Bean and performing
the following exercises:
Create a Trader
Buy some shares using the Trader
Sell some shares using the Trader
Remove the Trader
</TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="TraderBean.html">TraderBean</A></B></TD>
<TD>TraderBean is a stateless Session Bean. </TD>
</TR>
<TR BGCOLOR="white" CLASS="TableRowColor">
<TD WIDTH="15%"><B><A HREF="TradeResult.html">TradeResult</A></B></TD>
<TD>This class reflects the results of a buy/sell transaction.</TD>
</TR>
</TABLE>
<P>
<A NAME="package_description"><!-- --></A><H2>
Package examples.ejb20.basic.statelessSession Description
</H2>
<P>
<p>This example is a package that demonstrates an
Enterprise JavaBean written to the EJB 2.0 specification. The example is a stateless session EJBean
called <font face="Courier New" size=-1>TraderBean</font>.
<p>
The example demonstrates:
<ul>
<li>Usage of a session EJBean written to the EJB 2.0 specification
<li>Stateless; client must maintain any state across calls to the EJBean
<li>Using application-defined exceptions and utilities
<li><a href="#Client">Client</a> Application
</ul>
<h3>
Pre-Built Examples</h3>
<p>This EJB 2.0 example is shipped pre-built. However, if you want to re-run this example, you can build it following the instructions in <a href="#Build the example">Build the example</a> and then re-run it following the instructions in <a href="#Run the example">Run the example</a>.
<a name="Client"></a><h2>Client Application</h2>
The Client
application performs these steps:
<ol>
<li>Creates a Trader
<li>Buys and sells shares of "BEAS", "MSFT", "AMZN", and "HWP"
<br>(The EJB does not actually "buy" or "sell"; it
simulates the actions of accessing a database.)
<li>Removes the Trader
</ol>
The application demonstrates how the client must maintain any
persistent state -- such as the change in the cash account -- across
repeated calls to the session EJBean.
All the logic for the balance is encapsulated
in the Client, unlike the
<a href="../statefulSession/package-summary.html">stateful session example</a>,
where all the persistence is provided by the container and the
logic is maintained in the EJBean.
<p>
To get the most out of this example, first read through the source code files
to see what is happening.
<ul>
<li>Client applications
<dd><a href="Client.java">Client.java</a>
<p>
<li>Interfaces
<dd><a href="Trader.java">Trader.java</a>
<dd><a href="TraderHome.java">TraderHome.java</a>
<dd><a href="TradeResult.java">TradeResult.java</a>
<p>
<li>Deployment
<dd><a href="ejb-jar.xml">ejb-jar.xml</a>
<dd><a href="weblogic-ejb-jar.xml">weblogic-ejb-jar.xml</a>
<p>
<li> Server (EJBean)
<dd><a href="TraderBean.java">TraderBean.java</a>
</ul>
Start with the XML deployment files <a href="ejb-jar.xml">ejb-jar.xml</a> and <a href="weblogic-ejb-jar.xml">weblogic-ejb-jar.xml</a> to find the general structure of the EJBean, which classes are used for the
different objects and interfaces, then look at
<a href="Client.java">Client.java</a> to see how the application works.
<p>
These three sections cover what to do:
<p>
<ol>
<li><a href="#Build the example">Build the example</a>
<li><a href="#Start the Examples server">Start the Examples server</a>
<li><a href="#Run the example">Run the example</a>
</ol>
<h3><a name="Build the example">Build the example</a></h3>
Set up your development shell as described in
<a href=../../../examples.html#environment>Setting up your environment</a>.
<p>
We provide a build script for you to build the example:
<p>The build script is <b><a href="build.xml">build.xml</a></b>.
<p>Run the build script using the following Java ant command:
<pre>prompt><b> ant</b></pre>
<p>
The script will build the example and place the files in the
correct locations in your WebLogic Server distribution:
<ul>
<li>Client.jar file: in <font face="Courier New" size=-1>SAMPLES_HOME\server\examples\build\clientclasses</font>
<li>EJB (in EAR file): in <font face="Courier New" size=-1>SAMPLES_HOME\domains\examples\applications\ejb20_basic_statelessSession.ear</font>
</ul>
<p>
Running the build script places the EJB in the <font face="Courier New"
size=-1>%applications%</font> directory, where it automatically
deploys once the server is started. If you are already running the server and build
another EJB, it is automatically placed in this directory and instantly deployed.
<p>
Additional information on using the build scripts
is found in
<a href="../../../examples.html#buildScripts">More About Building Examples</a>.
<h3><a name="Start the Examples server">Start the Examples server</a></h3>
<ol>
<li><a href=../../../examples.html#startServer>Start the Examples Server</a>.
<!-- Taking this out because the EJB deploys automatically when server starts; no need for manual deployment instructions
<p>
<li><a href=../../../examples.html#console >
Start the Administration Console.</a>
<p>
<li>Click the Deployments node in the left pane and select EJB.
<p>
A list of deployed EJBs displays in the left pane.
<p>
<li>Choose the EJB that you want to deploy from the list of deployment units.
<p>
<li>On the Edit EJB Descriptor page in the right pane, select the Targets tab.
<p>
<li> Verify that the EJB is deployed on the examplesServer. The examplesServer should be listed in the Chosen column.
-->
</ol>
<h3><a name="Run the example"></a>Run the example</h3>
<ol>
<p>
<li>Run the client in a separate command line window. Set up your client as described in
<a href=../../../examples.html#environment>Setting up your environment</a>,
and then run the client by entering:
<!--
<pre><font face="Courier New">prompt><b> java examples.ejb20.basic.statelessSession.Client</b></font></pre>
<p>
If you're not running the WebLogic Server with its default settings,
you will have to run the client using:
-->
<pre> prompt><b> ant run </b> </pre>
<p>
<li>If you're running the <font face="Courier New" size=-1>Client</font> example,
you should get output similar to this from the client application:
<pre><font face="Courier New">Beginning statelessSession.Client...
Creating a trader
Buying 100 shares of BEAS.
Buying 200 shares of MSFT.
Buying 300 shares of AMZN.
Buying 400 shares of HWP.
Selling 100 shares of BEAS.
Selling 200 shares of MSFT.
Selling 300 shares of AMZN.
Selling 400 shares of HWP.
Removing the trader
End statelessSession.Client...</font></pre>
</ol>
<h2>There's more...</h2>
Read more about EJB in
<a href="http://e-docs.bea.com/wls/docs81/ejb/index.html">BEA
WebLogic Server Enterprise Java Beans</a>.
<P>
<P>
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</td><td valign=bottom align=right>Documentation is available at<br> <a href=http://e-docs.bea.com/wls/docs81>http://e-docs.bea.com/wls/docs81</a></td></EM>
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