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PODDL generation and general persistence.xml settings (OpenJPA)
 

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  1. PODDL generation and general persistence.xml settings (OpenJPA)
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    <p><strong>Summary</strong></p> <p>I'm trying to run a Java web application JPA 2.0 example. The <a href="http://docs.oracle.com/javaee/6/tutorial/doc/giqst.html" rel="noreferrer">example application</a> was written to run in <code>Glassfish</code>, using <code>EclipseLink</code> as JPA provider. I would like to convert it to run in <code>TomEE</code> with <code>OpenJPA</code> as the JPA provider, but I can't any detailed tutorials for getting up and running with <code>OpenJPA</code>.</p> <p><strong>Problem</strong></p> <p>I'm having trouble converting <code>persistence.xml</code> to work with <code>OpenJPA</code> instead of <code>EclipseLink</code>. More specifically, the given <code>persistence.xml</code> doesn't specify:</p> <ul> <li><code>Entity</code> classes. Are these necessary?</li> <li>The desired JPA provider. Will the container default to something?</li> <li>The JDBC driver. How do I specify an "in-memory" DB (just for initial testing purposes)?</li> </ul> <p>Also:</p> <ul> <li>How are the DDL generation properties expressed in OpenJPA? I wasn't able to find them the <a href="http://openjpa.apache.org/builds/2.2.0/apache-openjpa/docs/manual.html" rel="noreferrer">OpenJPA User Guide</a>.</li> </ul> <p><strong>Details</strong></p> <p>Below is the EclipseLink <code>persistence.xml</code>:</p> <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt; &lt;persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd"&gt; &lt;persistence-unit name="order" transaction-type="JTA"&gt; &lt;jta-data-source&gt;jdbc/__default&lt;/jta-data-source&gt; &lt;properties&gt; &lt;property name="eclipselink.ddl-generation" value="drop-and-create-tables" /&gt; &lt;property name="eclipselink.ddl-generation.output-mode" value="both" /&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; &lt;/persistence&gt; </code></pre> <p>I have the following <code>Entity</code> classes:</p> <ul> <li><code>order.entity.LineItem</code></li> <li><code>order.entity.LineItemKey</code></li> <li><code>order.entity.Order</code></li> <li><code>order.entity.Part</code></li> <li><code>order.entity.PartKey</code></li> <li><code>order.entity.Vendor</code></li> <li><code>order.entity.VendorPart</code></li> </ul> <p><strong>Question</strong></p> <ul> <li>Does anyone know what the equivalent persistence.xml would look like for OpenJPA?</li> <li>Alternatively, if anyone could point me to an OpenJPA tutorial that covers these issues that would be just as good</li> </ul>
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    1. COHave you spent any time reading the OpenJPA user manual?
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    2. COIf you have a specific link, that would be **swell**. I'm going through these now: http://openjpa.apache.org/samples.html
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    3. COI haven't been able to find any persistence.xml properties for DDL generation, in here: http://openjpa.apache.org/builds/2.2.0/apache-openjpa/docs/manual.html
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