session5.html

j2eePDF格式的电子书

<a name="wp80614"> </a><div class="pSmartList2"><li>Read the explanatory text for an overview of the wizard's features. </li></div>
<a name="wp80615"> </a><div class="pSmartList2"><li>Click Next.</li></div>
</ol></div>
<a name="wp80616"> </a><div class="pSmartList1"><li> JAR File Contents dialog box</li></div>
<div class="pSmartList2"><ol type="a" class="pSmartList2">
<a name="wp80617"> </a><div class="pSmartList2"><li>Select the button labelled Create New AppClient Module in Application.</li></div>
<a name="wp80618"> </a><div class="pSmartList2"><li>In the combo box below this button, select <code class="cCode">TimerSessionApp</code>.</li></div>
<a name="wp80619"> </a><div class="pSmartList2"><li>In the AppClient Display Name field, enter <code class="cCode">TimerSessionClient</code>.</li></div>
<a name="wp80620"> </a><div class="pSmartList2"><li>Click Edit.</li></div>
<a name="wp80621"> </a><div class="pSmartList2"><li>In the tree under Available Files, locate the <code class="cVariable">&lt;INSTALL&gt;</code><code class="cCode">/j2eetutorial14/examples/ejb/timersession/build </code>directory.</li></div>
<a name="wp80622"> </a><div class="pSmartList2"><li>Select the <code class="cCode">TimerSessionClient.class</code> file</li></div>
<a name="wp80623"> </a><div class="pSmartList2"><li>Click Add. </li></div>
<a name="wp80624"> </a><div class="pSmartList2"><li>Click OK.</li></div>
<a name="wp80625"> </a><div class="pSmartList2"><li>Click Next.</li></div>
</ol></div>
<a name="wp80626"> </a><div class="pSmartList1"><li>General dialog box </li></div>
<div class="pSmartList2"><ol type="a" class="pSmartList2">
<a name="wp80627"> </a><div class="pSmartList2"><li>In the Main Class combo box, select <code class="cCode">TimerSessionClient</code>.</li></div>
<a name="wp80628"> </a><div class="pSmartList2"><li>Click Next.</li></div>
<a name="wp80629"> </a><div class="pSmartList2"><li>Click Finish.</li></div>
</ol></div>
</ol></div>
<a name="wp80630"> </a><h4 class="pHeading3">
Specifying the Application Client's Enterprise Bean Reference
</h4>
<a name="wp80631"> </a><p class="pBody">
When it invokes the <code class="cCode">lookup</code> method, the <code class="cCode">TimerSessionClient</code> refers to the home of an enterprise bean:
</p>
<div class="pPreformattedRelative"><pre class="pPreformattedRelative">
Object objref =
&nbsp;&nbsp;initial.lookup(&quot;java:comp/env/ejb/SimpleTimerSession&quot;);<a name="wp80632"> </a>
</pre></div>
<a name="wp80633"> </a><p class="pBody">
You specify this reference as follows.
</p>
<div class="pSmartList1"><ol type="1" class="pSmartList1">
<a name="wp80634"> </a><div class="pSmartList1"><li>In the tree, select <code class="cCode">TimerSessionClient</code>.</li></div>
<a name="wp80635"> </a><div class="pSmartList1"><li>Select the EJB Refs tab.</li></div>
<a name="wp80636"> </a><div class="pSmartList1"><li>Click Add.</li></div>
<a name="wp80637"> </a><div class="pSmartList1"><li>In the Coded Name field, enter <code class="cCode">ejb/SimpleTimerSession</code>.</li></div>
<a name="wp80638"> </a><div class="pSmartList1"><li>In the EJB Type field, select <code class="cCode">Session</code>.</li></div>
<a name="wp80639"> </a><div class="pSmartList1"><li>In the Interfaces field, select <code class="cCode">Remote</code>.</li></div>
<a name="wp80640"> </a><div class="pSmartList1"><li>In the Home Interface field, enter <code class="cCode">TimerSessionHome</code>.</li></div>
<a name="wp80641"> </a><div class="pSmartList1"><li>In the Local/Remote Interface field, enter <code class="cCode">TimerSession</code>.</li></div>
<a name="wp80642"> </a><div class="pSmartList1"><li>In the JNDI field, enter <code class="cCode">TimerSessionEJB</code>.</li></div>
<a name="wp80643"> </a><div class="pSmartList1"><li>Click OK.</li></div>
</ol></div>
<a name="wp80650"> </a><h4 class="pHeading3">
Deploying the Enterprise Application
</h4>
<a name="wp80652"> </a><p class="pBody">
Now that the J2EE application contains the components, it is ready for deployment. 
</p>
<div class="pSmartList1"><ol type="1" class="pSmartList1">
<a name="wp80653"> </a><div class="pSmartList1"><li>Select <code class="cCode">TimerSessionApp</code>.</li></div>
<a name="wp80654"> </a><div class="pSmartList1"><li>Select Tools<span style="font-family: Symbol"><img src="images/arrwrite.gif" border="0" alt="Right Arrow"></span>Deploy.</li></div>
<a name="wp80655"> </a><div class="pSmartList1"><li>Under Connection Settings, enter the user name and password for the J2EE application server. </li></div>
<a name="wp80923"> </a><div class="pSmartList1"><li>Under Application Client Stub Directory check Return Client Jar.</li></div>
<a name="wp80924"> </a><div class="pSmartList1"><li>In the field below the checkbox enter <code class="cVariable">&lt;INSTALL&gt;</code><code class="cCode">/j2eetutorial14/examples/ejb/timersession/</code>.</li></div>
<a name="wp80656"> </a><div class="pSmartList1"><li>Click OK.</li></div>
<a name="wp80657"> </a><div class="pSmartList1"><li>In the Distribute Module dialog box click Close when the deployment completes.</li></div>
<a name="wp80658"> </a><div class="pSmartList1"><li>Verify the deployment.</li></div>
<div class="pSmartList2"><ol type="a" class="pSmartList2">
<a name="wp80659"> </a><div class="pSmartList2"><li>In the tree, expand the Servers node and select the host that is running the J2EE server.</li></div>
<a name="wp80660"> </a><div class="pSmartList2"><li>In the Deployed Objects table, make sure that <code class="cCode">TimerSessionApp</code> is listed and its status is <code class="cCode">Running</code>.</li></div>
<a name="wp80931"> </a><div class="pSmartList2"><li>Verify that <code class="cCode">TimerSessionAppClient.jar</code> is in <code class="cVariable">&lt;INSTALL&gt;</code><code class="cCode">/j2eetutorial14/examples/ejb/timersession/.</code></li></div>
</ol></div>
</ol></div>
<a name="wp80671"> </a><h4 class="pHeading3">
Running the J2EE Application Client
</h4>
<a name="wp80672"> </a><p class="pBody">
To run the J2EE application client, perform the following steps.
</p>
<div class="pSmartList1"><ol type="1" class="pSmartList1">
<a name="wp80673"> </a><div class="pSmartList1"><li>In a terminal window, go to the <code class="cVariable">&lt;INSTALL&gt;</code><code class="cCode">/j2eetutorial14/<br />examples/ejb/timersession/</code> directory.</li></div>
<a name="wp80674"> </a><div class="pSmartList1"><li>Type the following command:</li></div>
<a name="wp81596"> </a><p class="pBodyRelative">
<code class="cCode">appclient -client TimerSessionAppClient.jar</code> 
</p>
<a name="wp81597"> </a><div class="pSmartList1"><li>In the terminal window, the client displays these lines:</li></div>
<a name="wp80677"> </a><p class="pBodyRelative">
<code class="cCode">Creating a timer with an interval duration of 30000 ms.</code> 
</p>
</ol></div>
<a name="wp80678"> </a><p class="pBody">
The output from the timer is sent to the server.log located in the <code class="cCode">&lt;</code><code class="cVariable">J2EE_HOME</code><code class="cCode">&gt;/domains/domain1/server/logs/</code> directory. After about 30 seconds, open up <code class="cCode">server.log</code> in a text editor and you will see the following lines:
</p>
<div class="pPreformattedRelative"><pre class="pPreformattedRelative">
TimerSessionBean: setSessionContext
TimerSessionBean: ejbCreate
TimerSessionBean: start createTimer 
TimerSessionBean: ejbTimeout <a name="wp80679"> </a>
</pre></div>
<hr>
<a name="wp80944"> </a><p class="pNote">
Note: To run the <code class="cCode">TimerSessionEJB</code> example, you must start the PointBase server before you start the J2EE application server. If you don&#39;t start the PointBase server, or if you start it after the J2EE application server, then you will get a <code class="cCode">java.rmi.RemoteException</code> with the message, <code class="cCode">EJB Timer service not available</code>.
</p>
<hr>
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