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POHow to reuse class declarations from a persistence.xml?
 

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  1. POHow to reuse class declarations from a persistence.xml?
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    <p>I am working on a project that uses JPA/HIbernate and Spring for persistence and transaction management. This application has tables mapped from several catalogs and schemas from the same database server (a Sybase environment).</p> <p>In order to start creating automated tests for this app using an in-memory database, I had to create an alternative <code>test-persistence.xml</code> listing all the same entities from the default <code>persistence.xml</code>, but specifying alternative <code>orm.xml</code> mapping files that override the schema information from the annotations in the classes.</p> <p>The critical piece in my Spring configuration for tests is like this:</p> <pre><code>&lt;bean id="hsqlFixes" class="com.example.app.util.HSQLFixes" /&gt; &lt;bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" depends-on="hsqlFixes"&gt; &lt;property name="persistenceUnitName" value="puName" /&gt; &lt;property name="persistenceXmlLocation" value="META-INF/persistence-tests.xml" /&gt; .... &lt;/bean&gt; </code></pre> <p><sub>Where <code>HSQLFixes</code> is a bean that executes some JDBC statements just creating some types.</sub></p> <p>And in the <code>persistence-tests.xml</code>:</p> <pre><code>&lt;persistence-unit name="puName" transaction-type="RESOURCE_LOCAL"&gt; &lt;mapping-file&gt;META-INF/orm-tests-db1.xml&lt;/mapping-file&gt; &lt;mapping-file&gt;META-INF/orm-tests-db2.xml&lt;/mapping-file&gt; &lt;mapping-file&gt;META-INF/orm-tests-db3.xml&lt;/mapping-file&gt; ... followed by the same list of entities from persistence.xml </code></pre> <p>Now, I want to get rid of the duplication of the classes listing in <code>persistence.xml</code> and <code>test-persistence.xml</code>, cause I feel I could automate the generation of this second file.</p> <p>How could I go to do it dynamically, so that I don't need to change both XML files when I add/remove an entity?</p>
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