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From conflue...@apache.org
Subject [CONF] Apache Geronimo v2.2: Developing container managed persistence with JPA (page edited)
Date Tue, 09 Dec 2008 03:24:00 GMT
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/******* Edit Page Styles *******/
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</head>
<body>

<div id="PageContent">
<table class="pagecontent" border="0" cellpadding="0" cellspacing="0" width="100%"><tr>
<td valign="top" class="pagebody">

    <div class="pageheader">
        <span class="pagetitle">
            Page Edited :
            <a href="http://cwiki.apache.org/confluence/display/GMOxDOC22">GMOxDOC22</a> :
            <a href="http://cwiki.apache.org/confluence/display/GMOxDOC22/Developing+container+managed+persistence+with+JPA">Developing container managed persistence with JPA</a>
        </span>
    </div>

     <p>
        <a href="http://cwiki.apache.org/confluence/display/GMOxDOC22/Developing+container+managed+persistence+with+JPA">Developing container managed persistence with JPA</a>
        has been edited by             <a href="http://cwiki.apache.org/confluence/display/~sophia">Ying Tang</a>
            <span class="smallfont">(Dec 08, 2008)</span>.
     </p>
    
     <p>
                 <a href="http://cwiki.apache.org/confluence/pages/diffpagesbyversion.action?pageId=93372&originalVersion=8&revisedVersion=9">(View changes)</a>
     </p>

    <span class="label">Content:</span><br/>
    <div class="greybox wiki-content"><style type='text/css'>/*<![CDATA[*/
table.ScrollbarTable  {border: none;padding: 3px;width: 100%;padding: 3px;margin: 0px;background-color: #f0f0f0}
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/*]]>*/</style><div class="Scrollbar"><table class='ScrollbarTable'><tr><td class='ScrollbarPrevIcon'><a href="/confluence/display/GMOxDOC22/Developing+bean+managed+persistence+with+JPA"><img border='0' align='middle' src='/confluence/images/icons/back_16.gif' width='16' height='16'></a></td><td width='33%' class='ScrollbarPrevName'><a href="/confluence/display/GMOxDOC22/Developing+bean+managed+persistence+with+JPA">Developing bean managed persistence with JPA</a>&nbsp;</td><td width='33%' class='ScrollbarParent'><sup><a href="/confluence/display/GMOxDOC22/Developing+JPA+applications"><img border='0' align='middle' src='/confluence/images/icons/up_16.gif' width='8' height='8'></a></sup><a href="/confluence/display/GMOxDOC22/Developing+JPA+applications">Developing JPA applications</a></td><td width='33%' class='ScrollbarNextName'>&nbsp;<a href="/confluence/display/GMOxDOC22/Working+with+JSF+and+JPA">Working with JSF and JPA</a></td><td class='ScrollbarNextIcon'><a href="/confluence/display/GMOxDOC22/Working+with+JSF+and+JPA"><img border='0' align='middle' src='/confluence/images/icons/forwd_16.gif' width='16' height='16'></a></td></tr></table></div>
<p>The Java Persistence API is a new programming model under EJB3.0 specification (JSR220) for the management of persistence and object/relational mapping with Java EE and Java SE. With JPA, developers can easily develop java applications that perform operations on relational database management systems using java objects and mapping. In that way, java applications developed using JPA are not only portable across different platforms, but also applications can be easily developed using simple yet powerful programming model provided by JPA. This greatly improves application maintainability against ever changing database world. JPA insulates applications from all the complexity and non-portable boilerplate code involved in database connectivity and operations.</p>

<p>Apache geronimo uses <span class="nobr"><a href="http://openjpa.apache.org/" title="Visit page outside Confluence" rel="nofollow">OpenJPA<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> for providing Java Persistence API to Java EE applications deployed in the server. Even though JPA is a part of EJB3.0 spec, it is independent of it. Hence, JPA can be used in JavaSE, web and ejb applications in the same uniform way. </p>

<p>Below tutorial illustrates the use of container managed entity manager object. When @PersistenceContext annotation is used, container injects <tt>EntityManager</tt> object to the reference. The persistence context of the entity manager is propagated along with any transaction that is currently active. If the transaction spans across components, all the entity manager object references that point to same persistence unit will have the same persistence context through out the transaction. Thus, any changes made to the entities through any entity manager reference, are seen through other entity manager references. The persistence scope of the container managed entity manager is <tt>Transaction</tt> by default. The <tt>transaction-type</tt> is always <tt>JTA</tt>. That is,  entity manager object is always registered with the transaction which is active when entity manager is invoked. In summary, the life cycle of the entity manager and the associated persistence context is managed automatically by the container. </p>

<p>The tutorial creates an enterprise application that has an ejb module and a web module. The ejb module uses <tt>Account</tt> entity with <tt>AccountNumber</tt> as primary key along with <tt>OwnerName</tt> and <tt>Balance</tt> attributes to create accounts in the <tt>AccountDB</tt> database. The <tt>AccountDB</tt> is created in the embedded derby database. The <tt>AccountBean</tt> in the ejb module has the methods to create the Account entities, deposit amount into an account, withdraw amount from an account and retrieve the available balance in a account. The wed module has a servlet that retrieves source account number, destination account number and the amount from user, and performs transfer of the amount from source account to destination account. </p>

<p>The web module uses container injected <tt>EntityManager</tt> object to check whether the source account has enough available balance to perform the transfer. If yes, it invokes ejb to withdraw the amount from the source account and deposits the same amount in the destination account. Finally, the servlet uses the injected <tt>EntityManager</tt> object to print the balances in the source and destination accounts. All the above mentioned operations are performed within a JTA transaction. So, persistence context of the entity manager is propagated across web and ejb modules. Hence, any changes made to the entities in ejb module are seen in the web modules when the available balance values are printed.</p>

<p>In order to develop, deploy and run the application, the following environment is required.</p>

<ul>
	<li>Sun JDK 5.0+ (J2SE 1.5)</li>
	<li>Eclipse 3.3.1.1 (Eclipse Classic package of Europa distribution), which is platform specific</li>
	<li>Web Tools Platform (WTP) 2.0.1</li>
	<li>Data Tools Platform (DTP) 1.5.1</li>
	<li>Eclipse Modeling Framework (EMF) 2.3.1</li>
	<li>Graphical Editing Framework (GEF) 3.3.1</li>
</ul>


<p>The tutorial is divided into the following sections.</p>

<ul>
	<li>Setting the Eclipse environment</li>
	<li>Creating ejb application with entities</li>
	<li>Creating web application</li>
	<li>Setting up the database tables and the Datasource.</li>
	<li>Deploying the (ear) application</li>
	<li>Running the application</li>
</ul>


<p>The entire application can be downloaded from this <span class="nobr"><a href="/confluence/download/attachments/93372/ContainerManagedJPA-EAR.ear?version=1" title="ContainerManagedJPA-EAR.ear attached to Developing container managed persistence with JPA">link<sup><img class="rendericon" src="/confluence/images/icons/link_attachment_7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span>.</p>

<h2><a name="DevelopingcontainermanagedpersistencewithJPA-SettingtheEclipseenvironment"></a>Setting the Eclipse environment</h2>

<p>1. Download Apache Geronimo2.1 and install it on the server. Look into the geronimo documentation for   <br/>
   instructions.</p>

<p>2. Install the eclipse IDE and download geronimo eclipse plugin and install it on top of eclipse. Look into the<br/>
   geronimo eclipse plugin documentation for instructions.</p>

<p>3. Create a runtime environment for Apache Geronimo2.1 in the eclipse. Look into the geronimo eclipse plugin <br/>
   documentation for instructions to install a runtime for Apache Geronimo2.1.</p>

<h2><a name="DevelopingcontainermanagedpersistencewithJPA-Creatingejbapplicationwithentities"></a>Creating ejb application with entities</h2>

<p>1. Open the eclipse tool and change the perspective to <em>Java EE</em> by clicking on <br/>
   <em>Windows =&gt; Open Perspective =&gt; Other</em>. It will open up <em>Open Perspective</em> wizard. <br/>
   Select <em>Java EE</em> from the list and click <em>OK</em> button.</p>

<p>   <img src="/confluence/download/attachments/93372/1.jpg" align="absmiddle" border="0" /></p>

<p>2. Right click on the <em>Package Explorer</em> and select <em>EJB Project</em>. </p>

<p>   <img src="/confluence/download/attachments/93372/2.jpg" align="absmiddle" border="0" /></p>

<p>3. This will open up the <em>New EJB Project</em> wizard. Provide the values for <em>Project Name</em>, <em>Target Runtime</em> as given in the screen shot below. Click on <em>Next</em> button.</p>
<table cellpadding='5' width='85%' cellspacing='8px' class='noteMacro' border="0" align='center'><colgroup><col width='24'><col></colgroup><tr><td valign='top'><img src="/confluence/images/icons/emoticons/warning.gif" width="16" height="16" align="absmiddle" alt="" border="0"></td><td>
<p>If target runtime is not setup, create a new target runtime pointing to geronimo installation directory. For more information, look at the geronimo documentation that explains setting up eclipse plugin for geronimo and setting up runtime environment. This setup is required to resolve class dependencies during compilation.</p></td></tr></table>

<p>   <img src="/confluence/download/attachments/93372/3.jpg" align="absmiddle" border="0" /></p>

<p>4. Select the check boxes as given in the screen shot below and click on the <em>Next</em> button.</p>

<p>   <img src="/confluence/download/attachments/93372/4.jpg" align="absmiddle" border="0" /></p>

<p>5. Select the checkboxes as given in the below screen shot and click on the <em>Next</em> button.</p>

<p>   <img src="/confluence/download/attachments/93372/5.jpg" align="absmiddle" border="0" /></p>


<p>6. Provide the following values in textboxes and click on the <em>Finish</em> button.</p>

<p>   <img src="/confluence/download/attachments/93372/6.jpg" align="absmiddle" border="0" /></p>

<p>7. Right click on the <em>ContainerManagedJPA-EJB</em> project and navigate to <em>New =&gt; Class</em> option. Provide the <br/>
   following values in the <em>New Java Class</em> wizard and click on <em>Finish</em> button.</p>

<p>   <img src="/confluence/download/attachments/93372/7.jpg" align="absmiddle" border="0" /></p>


<p>8. Copy the following contents into <tt>Account.java</tt>.</p>
<div class="code" style="border-style: solid; "><div class="codeHeader" style="border-bottom-style: solid; "><b>sample.jpa.Account.java</b></div><div class="codeContent">
<pre class="code-java"><span class="code-keyword">package</span> sample.jpa;

<span class="code-keyword">import</span> java.io.Serializable;
<span class="code-keyword">import</span> javax.persistence.Entity;
<span class="code-keyword">import</span> javax.persistence.Id;
<span class="code-keyword">import</span> javax.persistence.PostLoad;
<span class="code-keyword">import</span> javax.persistence.PostUpdate;
<span class="code-keyword">import</span> javax.persistence.PrePersist;
<span class="code-keyword">import</span> javax.persistence.PreUpdate;
<span class="code-keyword">import</span> javax.persistence.Table;


@Entity
@Table(name = <span class="code-quote">"ACCOUNTCME"</span>)
<span class="code-keyword">public</span> class Account <span class="code-keyword">implements</span> Serializable {

 @Id
 <span class="code-keyword">public</span> <span class="code-object">int</span> accountNumber;
 <span class="code-keyword">public</span> <span class="code-object">String</span> ownerName;
 <span class="code-keyword">public</span> <span class="code-object">double</span> balance;


 <span class="code-keyword">public</span> Account() {
  accountNumber = (<span class="code-object">int</span>) <span class="code-object">System</span>.nanoTime();
 }

 <span class="code-keyword">public</span> <span class="code-object">String</span> toString() {
 <span class="code-keyword">return</span> <span class="code-quote">"Acc.# "</span> + accountNumber + <span class="code-quote">", owner"</span> + ownerName 
        + <span class="code-quote">", balance: "</span> + balance
        + <span class="code-quote">" $"</span>;
 }

 @PrePersist
 <span class="code-keyword">public</span> void prepersist() {
  <span class="code-object">System</span>.out.println(<span class="code-quote">"pre persist!!"</span>);
 }

 @PreUpdate
 <span class="code-keyword">public</span> void preupdate() {
  <span class="code-object">System</span>.out.println(<span class="code-quote">"pre update!!"</span>);
 }

 @PostUpdate
 <span class="code-keyword">public</span> void postupdate() {
  <span class="code-object">System</span>.out.println(<span class="code-quote">"post update!!"</span>);
 }

 @PostLoad
 <span class="code-keyword">public</span> void postload() {
  <span class="code-object">System</span>.out.println(<span class="code-quote">"post load!!"</span>);
 }

 <span class="code-keyword">public</span> <span class="code-object">int</span> getAccountNumber() {
  <span class="code-keyword">return</span> accountNumber;
 }

 <span class="code-keyword">public</span> void setAccountNumber(<span class="code-object">int</span> accountNumber) {
  <span class="code-keyword">this</span>.accountNumber = accountNumber;
 }

 <span class="code-keyword">public</span> <span class="code-object">String</span> getOwnerName() {
  <span class="code-keyword">return</span> ownerName;
 }

 <span class="code-keyword">public</span> void setOwnerName(<span class="code-object">String</span> ownerName) {
  <span class="code-keyword">this</span>.ownerName = ownerName;
 }

 <span class="code-keyword">public</span> void setBalance(<span class="code-object">double</span> balance) {
  <span class="code-keyword">this</span>.balance = balance;
 }

 <span class="code-keyword">public</span> <span class="code-object">double</span> getBalance() {
 <span class="code-keyword">return</span> balance;
 }
}</pre>
</div></div>

<p>9. Similarly, create <tt>AccountInterface.java</tt> and copy the following contents.</p>
<div class="code" style="border-style: solid; "><div class="codeHeader" style="border-bottom-style: solid; "><b>sample.jpa.AccountInterface.java</b></div><div class="codeContent">
<pre class="code-java"><span class="code-keyword">package</span> sample.jpa;

<span class="code-keyword">public</span> <span class="code-keyword">interface</span> AccountInterface {

 <span class="code-keyword">public</span> Account open(<span class="code-object">int</span> accountNumber) ;
 <span class="code-keyword">public</span> <span class="code-object">double</span> getBalance(<span class="code-object">int</span> accountNumber);
 <span class="code-keyword">public</span> void deposit(<span class="code-object">int</span> accountNumber,<span class="code-object">double</span> amount) ;
 <span class="code-keyword">public</span> <span class="code-object">double</span> withdraw(<span class="code-object">int</span> accountNumber,<span class="code-object">double</span> amount) ;
}</pre>
</div></div>
<p>10. Similarly, create <tt>AccountBean.java.java</tt> and copy the following contents.</p>
<div class="code" style="border-style: solid; "><div class="codeHeader" style="border-bottom-style: solid; "><b>sample.jpa.AccountBean.java</b></div><div class="codeContent">
<pre class="code-java"><span class="code-keyword">package</span> sample.jpa;


<span class="code-keyword">import</span> javax.ejb.EJBException;
<span class="code-keyword">import</span> javax.ejb.Remote;
<span class="code-keyword">import</span> javax.ejb.Stateless;
<span class="code-keyword">import</span> javax.ejb.TransactionAttribute;
<span class="code-keyword">import</span> javax.ejb.TransactionAttributeType;
<span class="code-keyword">import</span> javax.persistence.EntityManager;
<span class="code-keyword">import</span> javax.persistence.PersistenceContext;
<span class="code-keyword">import</span> javax.persistence.PersistenceContextType;


@Stateless
@Remote(AccountInterface.class)
<span class="code-keyword">public</span> class AccountBean <span class="code-keyword">implements</span> AccountInterface { 

 @PersistenceContext(type=PersistenceContextType.TRANSACTION)    
 <span class="code-keyword">private</span> EntityManager manager;


 @TransactionAttribute(TransactionAttributeType.REQUIRED)    
 <span class="code-keyword">public</span> Account open(<span class="code-object">int</span> accountNumber) {
  Account account = manager.find(Account.class, accountNumber);
  <span class="code-keyword">if</span>(account == <span class="code-keyword">null</span>){
   account = <span class="code-keyword">new</span> Account();
   account.ownerName = <span class="code-quote">"anonymous"</span>;
   account.accountNumber = accountNumber;
   manager.persist(account);
   <span class="code-keyword">return</span> account;
  }<span class="code-keyword">else</span>{
   <span class="code-keyword">throw</span> <span class="code-keyword">new</span> EJBException(<span class="code-quote">"Account already exists..!!. Account <span class="code-object">Number</span> = "</span>+accountNumber);
  }
 }    

 @TransactionAttribute(TransactionAttributeType.REQUIRED)    
 <span class="code-keyword">public</span> <span class="code-object">double</span> getBalance(<span class="code-object">int</span> accountNumber) {
  Account account = manager.find(Account.class, accountNumber);
  <span class="code-keyword">if</span>(account==<span class="code-keyword">null</span>)
   <span class="code-keyword">throw</span> <span class="code-keyword">new</span> EJBException(<span class="code-quote">"Account not found..!!. Account <span class="code-object">Number</span> = "</span>+accountNumber);
  <span class="code-keyword">return</span> account.balance;
 }

 @TransactionAttribute(TransactionAttributeType.REQUIRED)
 <span class="code-keyword">public</span> void deposit(<span class="code-object">int</span> accountNumber, <span class="code-object">double</span> amount) {
  Account account = manager.find(Account.class, accountNumber);
  <span class="code-keyword">if</span>(account==<span class="code-keyword">null</span>)
   <span class="code-keyword">throw</span> <span class="code-keyword">new</span> EJBException(<span class="code-quote">"Account not found..!!. Account <span class="code-object">Number</span> = "</span>+accountNumber);
  <span class="code-object">double</span> new_balance = account.getBalance() + amount;
  account.setBalance(new_balance);
 }

 @TransactionAttribute(TransactionAttributeType.REQUIRED)    
 <span class="code-keyword">public</span> <span class="code-object">double</span> withdraw(<span class="code-object">int</span> accountNumber, <span class="code-object">double</span>  amount) { 
  Account account = manager.find(Account.class, accountNumber);
  <span class="code-keyword">if</span>(account==<span class="code-keyword">null</span>)
   <span class="code-keyword">throw</span> <span class="code-keyword">new</span> EJBException(<span class="code-quote">"Account not found..!!. Account <span class="code-object">Number</span> = "</span>+accountNumber);
  <span class="code-keyword">if</span> (amount &gt; account.getBalance()) {
   <span class="code-keyword">return</span> 0;
  }<span class="code-keyword">else</span> {
   <span class="code-object">double</span> new_balance = account.getBalance() - amount;
   account.setBalance(new_balance);
   <span class="code-keyword">return</span> amount;
  }
 }
}</pre>
</div></div>

<p>11. As outlined above, right click on the <tt>META_INF</tt> directory of <tt>ContainerManagedJPA-EJB</tt> project and  <br/>
    create <tt>persistence.xml</tt>. Copy the following contents into <tt>persistence.xml</tt>.</p>
<div class="code" style="border-style: solid; "><div class="codeHeader" style="border-bottom-style: solid; "><b>persistence.xml</b></div><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;?xml version=<span class="code-quote">"1.0"</span> encoding=<span class="code-quote">"UTF-8"</span>?&gt;</span>
&lt;persistence xmlns=<span class="code-quote">"http://java.sun.com/xml/ns/persistence"</span>
 <span class="code-keyword">xmlns:xsi</span>=<span class="code-quote">"http://www.w3.org/2001/XMLSchema-instance"</span> version=<span class="code-quote">"1.0"</span>
 xsi:schemaLocation="http://java.sun.com/xml/ns/persistence  
 http://java.sun.com/xml/ns/persistence/persistence_1_0.xsd"&gt;

 <span class="code-tag">&lt;persistence-unit name=<span class="code-quote">"AccountUnit"</span> transaction-type=<span class="code-quote">"JTA"</span>&gt;</span>
  <span class="code-tag">&lt;description&gt;</span>ContainerManagedJPA<span class="code-tag">&lt;/description&gt;</span>
  <span class="code-tag">&lt;provider&gt;</span>org.apache.openjpa.persistence.PersistenceProviderImpl<span class="code-tag">&lt;/provider&gt;</span>
  <span class="code-tag">&lt;jta-data-source&gt;</span>AccountDS<span class="code-tag">&lt;/jta-data-source&gt;</span>
  <span class="code-tag">&lt;class&gt;</span>sample.jpa.Account<span class="code-tag">&lt;/class&gt;</span>
 <span class="code-tag">&lt;/persistence-unit&gt;</span>
<span class="code-tag">&lt;/persistence&gt;</span></pre>
</div></div>

<p>12. Since we are going to use EJB annotations, the <tt>META-INF/ejb-jar.xml</tt> will not have any declarations. The contents of the <tt>META-INF/openejb-jar.xml</tt> file should be as below. Otherwise, modify it accordingly.</p>
<div class="code" style="border-style: solid; "><div class="codeHeader" style="border-bottom-style: solid; "><b>openejb-jar.xml</b></div><div class="codeContent">
<pre class="code-xml"><span class="code-tag">&lt;?xml version=<span class="code-quote">"1.0"</span> encoding=<span class="code-quote">"UTF-8"</span>?&gt;</span>
&lt;openejb-jar xmlns=<span class="code-quote">"http://openejb.apache.org/xml/ns/openejb-jar-2.2"</span> 
 <span class="code-keyword">xmlns:naming</span>=<span class="code-quote">"http://geronimo.apache.org/xml/ns/naming-1.2"</span> 
 <span class="code-keyword">xmlns:sec</span>=<span class="code-quote">"http://geronimo.apache.org/xml/ns/security-2.0"</span> 
 <span class="code-keyword">xmlns:sys</span>=<span class="code-quote">"http://geronimo.apache.org/xml/ns/deployment-1.2"</span>&gt;
 
 <span class="code-tag">&lt;sys:environment&gt;</span>
  <span class="code-tag">&lt;sys:moduleId&gt;</span>
   <span class="code-tag">&lt;sys:groupId&gt;</span>ContainerManagedJPA<span class="code-tag">&lt;/sys:groupId&gt;</span>
   <span class="code-tag">&lt;sys:artifactId&gt;</span>EJB<span class="code-tag">&lt;/sys:artifactId&gt;</span>
   <span class="code-tag">&lt;sys:version&gt;</span>1.0<span class="code-tag">&lt;/sys:version&gt;</span>
   <span class="code-tag">&lt;sys:type&gt;</span>car<span class="code-tag">&lt;/sys:type&gt;</span>
  <span class="code-tag">&lt;/sys:moduleId&gt;</span>

  <span class="code-tag">&lt;dependencies&gt;</span>
   <span class="code-tag">&lt;dependency&gt;</span>
    <span class="code-tag">&lt;groupId&gt;</span>console.dbpool<span class="code-tag">&lt;/groupId&gt;</span>
    <span class="code-tag">&lt;artifactId&gt;</span>AccountDS<span class="code-tag">&lt;/artifactId&gt;</span>
   <span class="code-tag">&lt;/dependency&gt;</span>
  <span class="code-tag">&lt;/dependencies&gt;</span>

 <span class="code-tag">&lt;/sys:environment&gt;</span>
 <span class="code-tag">&lt;enterprise-beans/&gt;</span>
 <span class="code-tag">&lt;/openejb-jar&gt;</span></pre>
</div></div>

<p>13. Finally the project <tt>ContainerManagedJPA-EJB</tt> should like as below.</p>

<p><img src="/confluence/download/attachments/93372/8.jpg" align="absmiddle" border="0" /></p>


<h2><a name="DevelopingcontainermanagedpersistencewithJPA-Creatingwebapplication"></a>Creating web application </h2>

<p>1. Right click on the <em>Project Explorer</em> and select <em>New =&gt; Project</em>. This will popup <em>New Project</em> wizard.  <br/>
   Select <em>Dynamic Web Project</em> under option <em>Web</em>. Click on the <em>Next</em> button.</p>

<p><img src="/confluence/download/attachments/93372/9.jpg" align="absmiddle" border="0" /></p>

<p>2. Provide the values as given in the screen shot below on the <em>New Dynamic Web Project</em> wizard. Please note that <em>Add project to an EAR</em> checkbox is check to add this web project to <em>ContainerManagedJPA-EAR</em> created during the creation of <em>ContainerManagedJPA-EJB</em> project.</p>

<p><img src="/confluence/download/attachments/93372/10.jpg" align="absmiddle" border="0" /></p>

<p>3. In the next screen, select the <em>Version</em> values as given in the below figure and click on the <em>Next</em> button. </p>

<p><img src="/confluence/download/attachments/93372/11.jpg" align="absmiddle" border="0" /></p>

<p>4. Check on the <em>Generate Deployment Descriptor</em> checkbox and click on the <em>Next</em> button. On the next screen, configure the deployment plan as follows. After this, click on the <em>Finish</em> button to complete creating web project</p>

<p><img src="/confluence/download/attachments/93372/12.jpg" align="absmiddle" border="0" /></p>


<p>5. Right click on the <em>WebContent</em> folder of the web project and navigate to <em>New =&gt; HTML</em> to create the index.html file as given in the screen shot. Click on the <em>Next</em> button and on the next screen click on the <em>Finish</em> button. The content of the index.html is provided below the screen shot.</p>

<p><img src="/confluence/download/attachments/93372/13.jpg" align="absmiddle" border="0" /></p>

<div class="code" style="border-style: solid; "><div class="codeHeader" style="border-bottom-style: solid; "><b>index.html</b></div><div class="codeContent">
<pre class="code-actionscript">&lt;!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"&gt;
&lt;html&gt;
&lt;head&gt;
&lt;meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1"&gt;
&lt;title&gt;Input Account Numbers and Amount&lt;/title&gt;
&lt;/head&gt;
&lt;body&gt;
&lt;form name="input" action="/ContainerManagedJPA-WEB/Test"method="get"&gt;
&lt;table border="0"&gt;
&lt;tr&gt;
&lt;td align="right"&gt;&lt;font color="black" size="5"&gt; Debit Account <span class="code-object">Number</span>&lt;/font&gt;&lt;/td&gt;
&lt;td align="left"&gt;&lt;input type="text" name="account1"&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td align="right"&gt;&lt;font color="black" size="5"&gt; Credit Account <span class="code-object">Number</span>&lt;/font&gt;&lt;/td&gt;
&lt;td align="left"&gt;&lt;input type="text" name="account2"&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td align="right"&gt;&lt;font color="black" size="5"&gt; Amount to be Transfered &lt;/font&gt;&lt;/td&gt;
&lt;td align="left"&gt;&lt;input type="text" name="amount"&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;tr&gt;
&lt;td align="right"&gt;&lt;input type="submit" value="Submit"&gt;&lt;/td&gt;
&lt;td&gt;&lt;/td&gt;
&lt;/tr&gt;
&lt;/table&gt;
&lt;/form&gt;
&lt;/body&gt;
&lt;/html&gt;</pre>
</div></div>


<p>6. Right click on the web project and navigate to <em>New =&gt; Servlet</em> and click on it.</p>

<p><img src="/confluence/download/attachments/93372/14.jpg" align="absmiddle" border="0" /></p>


<p>7. On the <em>Create Servlet</em> wizard, provide the values as given in the below screen shot and click on the <em>Next</em> button.</p>

<p><img src="/confluence/download/attachments/93372/15.jpg" align="absmiddle" border="0" /></p>

<p>8. Select the defaults in the next screens and finally click on the <em>Finish</em> button.</p>


<p>9. Copy the below content into the servlet <tt>Test.java</tt></p>
<div class="code" style="border-style: solid; "><div class="codeHeader" style="border-bottom-style: solid; "><b>Test.java</b></div><div class="codeContent">
<pre class="code-java"><span class="code-keyword">package</span> sample.jpa;

<span class="code-keyword">import</span> java.io.IOException;
<span class="code-keyword">import</span> java.io.PrintWriter;

<span class="code-keyword">import</span> javax.ejb.EJB;
<span class="code-keyword">import</span> javax.naming.Context;
<span class="code-keyword">import</span> javax.naming.InitialContext;
<span class="code-keyword">import</span> javax.persistence.EntityManager;
<span class="code-keyword">import</span> javax.persistence.PersistenceContext;
<span class="code-keyword">import</span> javax.servlet.ServletException;
<span class="code-keyword">import</span> javax.servlet.http.HttpServletRequest;
<span class="code-keyword">import</span> javax.servlet.http.HttpServletResponse;
<span class="code-keyword">import</span> javax.transaction.UserTransaction;

<span class="code-keyword">public</span> class Test <span class="code-keyword">extends</span> javax.servlet.http.HttpServlet 
 <span class="code-keyword">implements</span> javax.servlet.Servlet {

 <span class="code-keyword">static</span> <span class="code-keyword">final</span> <span class="code-object">long</span> serialVersionUID = 1L;

 @PersistenceContext(unitName=<span class="code-quote">"AccountUnit"</span>)
 <span class="code-keyword">private</span> EntityManager em;

 @EJB AccountInterface accountBean;

 <span class="code-keyword">public</span> Test() {
  <span class="code-keyword">super</span>();
 }   	

 <span class="code-keyword">protected</span> void doGet(HttpServletRequest request, 
                      HttpServletResponse response) 
                      <span class="code-keyword">throws</span> ServletException, 
                      IOException {


 PrintWriter out = response.getWriter();

 <span class="code-object">int</span> accNo1 = <span class="code-object">Integer</span>.parseInt(
              request.getParameter(<span class="code-quote">"account1"</span>));
 <span class="code-object">int</span>  accNo2 = <span class="code-object">Integer</span>.parseInt(
              request.getParameter(<span class="code-quote">"account2"</span>));
 <span class="code-object">double</span> amount = <span class="code-object">Double</span>.parseDouble(
                 request.getParameter(<span class="code-quote">"amount"</span>));

 <span class="code-keyword">try</span>{
  Context ctx = <span class="code-keyword">new</span> InitialContext();
  UserTransaction ut = (UserTransaction)
                        ctx.lookup(<span class="code-quote">"java:comp/UserTransaction"</span>);
  ut.begin();

  Account account = em.find(Account.class, accNo1);
  <span class="code-keyword">if</span>(account.getBalance() &lt; amount){
   <span class="code-keyword">throw</span> <span class="code-keyword">new</span> Exception(<span class="code-quote">"&lt;font size=5&gt;Account "</span>+accNo1+
         <span class="code-quote">" does not have enough balance "</span>+amount+<span class="code-quote">"&lt;/font&gt;"</span>);
  }<span class="code-keyword">else</span>{
   outputText(out, <span class="code-quote">"2"</span>, <span class="code-quote">"green"</span>, 
              <span class="code-quote">"Message : Getting the balance amount available in Account <span class="code-object">Number</span> "</span>
              +accNo1+<span class="code-quote">" in the Test Servlet"</span>);

   outputText(out, <span class="code-quote">"5"</span>, <span class="code-quote">"black"</span>,<span class="code-quote">"Account ="</span>+
              accNo1+<span class="code-quote">" : Current balance "</span>+account.getBalance());
   out.println(<span class="code-quote">"&lt;br/&gt;"</span>);

   outputText(out, <span class="code-quote">"2"</span>, <span class="code-quote">"green"</span>,<span class="code-quote">"Message : Withdrawing amount ("</span>+
              amount+<span class="code-quote">") using AccountBean from the Account <span class="code-object">Number</span> "</span>+accNo1);

   accountBean.withdraw(accNo1, amount);

   outputText(out, <span class="code-quote">"2"</span>, <span class="code-quote">"green"</span>,
     <span class="code-quote">"Message : Getting the balance amount available in Account <span class="code-object">Number</span> "</span>+accNo1+
     <span class="code-quote">" in the Test Servlet after withdrawing"</span>);

   <span class="code-object">double</span> balance = account.getBalance();
   outputText(out, <span class="code-quote">"5"</span>, <span class="code-quote">"black"</span>,<span class="code-quote">"Account ="</span>+accNo1+
   <span class="code-quote">" : After withdrawing the balance is "</span>+balance);
   out.println(<span class="code-quote">"&lt;br/&gt;"</span>);

   outputText(out, <span class="code-quote">"2"</span>, <span class="code-quote">"green"</span>,
    <span class="code-quote">"Message : Getting the balance amount available in Account <span class="code-object">Number</span> "</span>+
    accNo2+<span class="code-quote">" in the Test Servlet"</span>);

   Account account2 = em.find(Account.class, accNo2);
   outputText(out, <span class="code-quote">"5"</span>, <span class="code-quote">"black"</span>,<span class="code-quote">"Account ="</span>+
    accNo2+<span class="code-quote">" : Current balance "</span>+account2.getBalance());
   
   out.println(<span class="code-quote">"&lt;br/&gt;"</span>);

   outputText(out, <span class="code-quote">"2"</span>, <span class="code-quote">"green"</span>,
    <span class="code-quote">"Message : depositing amount ("</span>+amount+
    <span class="code-quote">") using AccountBean to the Account <span class="code-object">Number</span> "</span>+accNo2);

   accountBean.deposit(accNo2, amount);
   outputText(out, <span class="code-quote">"2"</span>, <span class="code-quote">"green"</span>,
   <span class="code-quote">"Message : Getting the balance amount available in Account <span class="code-object">Number</span> "</span>+
   accNo2+<span class="code-quote">" in the Test Servlet after depositing"</span>);

   outputText(out, <span class="code-quote">"5"</span>, <span class="code-quote">"black"</span>,<span class="code-quote">"Account ="</span>+
              accNo2+<span class="code-quote">" : After depositing the balance is "</span>+
              account2.getBalance());

   out.println(<span class="code-quote">"&lt;br/&gt;"</span>);
   }
  ut.commit();
  }<span class="code-keyword">catch</span>(Exception e){
  <span class="code-keyword">throw</span> <span class="code-keyword">new</span> ServletException(e);
 }
}  	

 <span class="code-keyword">protected</span> void doPost(HttpServletRequest request, 
                       HttpServletResponse response) 
                       <span class="code-keyword">throws</span> ServletException, IOException {
 }   	

 <span class="code-keyword">private</span> void outputText(PrintWriter out, 
                         <span class="code-object">String</span> fontsize, 
                         <span class="code-object">String</span> color,
                         <span class="code-object">String</span> text){
  out.println(<span class="code-quote">"&lt;font size="</span>+fontsize+<span class="code-quote">" color="</span>+
                color+<span class="code-quote">"&gt;"</span>+text+<span class="code-quote">"&lt;/font&gt;"</span>+<span class="code-quote">"&lt;br/&gt;"</span>);
 }
}</pre>
</div></div>

<p>10. Right click on the <tt>ContainerManagedJPA-WEB</tt> project and click on <em>Properties</em> to open <em>Properties for ContainerManagedJPA-WEB</em> wizard. Click on the <em>Java Build Path</em> and <em>Projects</em> tab. Click on the <em>Add</em> button and add <tt>ContainerManagedJPA-EJB</tt> project. Finally, click on the <em>OK</em> button on <em>Properties for ContainerManagedJPA-WEB</em> wizard. This is required because, <tt>ContainerManagedJPA-WEB</tt> projects looks up <tt>AccountInterface</tt> ejb in the <tt>ContainerManagedJPA-EJB</tt> project. To resolve the dependency during compilation, the EJB project has to be added to the build path of the WEB project.</p>

<p><img src="/confluence/download/attachments/93372/16.jpg" align="absmiddle" border="0" /></p>


<h2><a name="DevelopingcontainermanagedpersistencewithJPA-SettingupthedatabasetablesandtheDatasource"></a>Setting up the database tables and the Datasource</h2>

<p>1. Start the geronimo server and open the admin console on a browser window with the url  <br/>
   <span class="nobr"><a href="http://localhost:8080/console" title="Visit page outside Confluence" rel="nofollow">http://localhost:8080/console<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span>.</p>

<p>2. Click on the <em>Embedded DB =&gt; DB Manager</em> on the <em>Console Navigation</em> portlet. </p>

<p>3. On the <em>Run SQL</em> portlet on the right side, enter <em>AccountDB</em> in the <em>Create DB</em> textbox and click on the <br/>
  <em>Create</em> button.</p>

<p><img src="/confluence/download/attachments/93372/17.jpg" align="absmiddle" border="0" /></p>

<p>4. The above step will create <tt>AccountDB</tt> database. On the same screen, enter the below SQL command on the <em>SQL Command/s</em> textarea and select <em>AccountDB</em> in the <em>Use DB</em> combo box and click on the <em>Run SQL</em> button. This will create <em>ACCOUNTCME</em> table in the <em>AccountDB</em> database.</p>

<div class="code" style="border-style: solid; "><div class="codeContent">
<pre class="code-sql">create table ACCOUNTCME (ACCOUNTNUMBER integer, OWNERNAME varchar(100), BALANCE decimal(15,2));</pre>
</div></div>

<p><img src="/confluence/download/attachments/93372/18.jpg" align="absmiddle" border="0" /></p>

<p>5. Also insert two rows using the below SQL command. </p>

<div class="code" style="border-style: solid; "><div class="codeContent">
<pre class="code-sql">insert into ACCOUNTCME values (1, 'Phani',2000);
insert into ACCOUNTCME values (2, 'Nag',2000);</pre>
</div></div>

<p>After inserting the rows, table will look like the below screen shot.</p>

<p><img src="/confluence/download/attachments/93372/19.jpg" align="absmiddle" border="0" /></p>


<p>6. We need to deploy datasource over AccountDB database for JPA. This datasource will be used by JPA to connect to database and perform DML operations. Admin console can be used to deploy a datasource over AccountDB. Click on the <em>services =&gt; Database Pools</em> in the <em>Console =&gt; Navigation</em> portlet. This will display the list of database pools currently running in the server.</p>

<p><img src="/confluence/download/attachments/93372/20.jpg" align="absmiddle" border="0" /></p>


<p>7. Click on the <em>Using the Geronimo database pool wizard</em> link. This will open up the <em>Database pools</em> portlet as follows. Provide  the value for <em>Name of the Database pool</em> as <em>AccountDS</em> and select <em>Derby embedded</em> as below and click on the <em>Next</em> button.</p>

<p><img src="/confluence/download/attachments/93372/21.jpg" align="absmiddle" border="0" /></p>


<p>8. On the next screen, select the JAR file listed in the <em>Driver JAR</em> select box and provide <em>AccountDB</em> as the value for Database Name and click on the <em>Deploy</em> button at the bottom. This will deploy the data source and display the list of datasources currently deployed on the server.</p>

<p><img src="/confluence/download/attachments/93372/22.jpg" align="absmiddle" border="0" /></p>

<p>9. In the eclipse, open the <tt>openejb-jar.xml</tt> and provide the dependency to the <tt>AccountDS</tt>. Finally, the <tt>openejb-jar.xml</tt> should be as below. This configuration is already done in the step-12 of <em>Creating ejb application with entities</em> above</p>

<h2><a name="DevelopingcontainermanagedpersistencewithJPA-Deployingthe%28ear%29application"></a>Deploying the (ear) application</h2>

<p>1. Deploy the EAR file as follows<br/>
<font color="white"><br/>
<div class="preformatted" style="border-style: solid; "><div class="preformattedContent" style="background-color: #000000; ">
<pre>C:\Geronimo-2.1\bin&gt;deploy.bat --user system --password manager deploy c:\temp\ContainerManagedJPA-EAR.ear
Using GERONIMO_BASE:   C:\Geronimo-2.1
Using GERONIMO_HOME:   C:\Geronimo-2.1
Using GERONIMO_TMPDIR: var\temp
Using JRE_HOME:        C:\SDK-May-31-2007\jre
    Deployed default/ContainerManagedJPA-EAR/1.0/car
      `-&gt; ContainerManagedJPA-WEB.war @ /ContainerManagedJPA-WEB
      `-&gt; ContainerManagedJPA-EJB.jar</pre>
</div></div></font></p>


<p>22. Running the application</p>

<p>1. Open a browser window and hit the URL as <span class="nobr"><a href="http://localhost:8080/ContainerManagedJPA-WEB/" title="Visit page outside Confluence" rel="nofollow">http://localhost:8080/ContainerManagedJPA-WEB/<sup><img class="rendericon" src="/confluence/images/icons/linkext7.gif" height="7" width="7" align="absmiddle" alt="" border="0"/></sup></a></span> <br/>
This page displays a html form with input fields for <em>Debit Account Number</em>, <em>Credit Account Number</em> and <em>Amount to be Transferred</em>. Enter the values as given in the below screen shot and click on the <em>Submit</em> button.</p>

<p><img src="/confluence/download/attachments/93372/23.jpg" align="absmiddle" border="0" /></p>

<p>2. On the next page, several messages are displayed as below. From the messages, it can seen that the persistence context is propagated along with the transaction and hence the changes made to Account balance in the ejb is observed in the servlet when <tt>account.getBalance(accountNumber)</tt> is called.</p>

<p><img src="/confluence/download/attachments/93372/24.jpg" align="absmiddle" border="0" /></p>

<p>3. The values of the balance fields in the <tt>ACCOUNTCME</tt> table after the transaction are as follows.</p>

<p><img src="/confluence/download/attachments/93372/25.jpg" align="absmiddle" border="0" /></p></div>


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