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POLiferay JPA ClassLoader Error
 

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  1. POLiferay JPA ClassLoader Error
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    <p><strong>EDITED (I'm simplifying as my original question was too convoluted):</strong></p> <p>Create a portlet plugin in Liferay 6.1.20</p> <p>Add in your portlet's web.xml a spring context loader</p> <pre><code>&lt;context-param&gt; &lt;param-name&gt;contextConfigLocation&lt;/param-name&gt; &lt;param-value&gt;/WEB-INF/applicationContext.xml&lt;/param-value&gt; &lt;/context-param&gt; &lt;listener&gt; &lt;listener-class&gt;org.springframework.web.context.ContextLoaderListener&lt;/listener-class&gt; &lt;/listener&gt; </code></pre> <p>Add in your application context an instance of an EntityManagerFactory</p> <pre><code>&lt;bean id="localEntityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"&gt; &lt;property name="persistenceXmlLocation" value="WEB-INF/classes/META-INF/persistence.xml" /&gt; &lt;/bean&gt; </code></pre> <p>Make sure in your persistance definition you're referencing a JPA Implementation</p> <pre><code>&lt;persistence-unit name="casd" transaction-type="RESOURCE_LOCAL"&gt; &lt;provider&gt;org.eclipse.persistence.jpa.PersistenceProvider&lt;/provider&gt; &lt;properties&gt; &lt;property name="eclipselink.weaving" value="false" /&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; </code></pre> <p>Watch Tomcat cry</p> <pre><code>java.lang.LinkageError: loader constraint violation in interface itable initialization: when resolving method "org.eclipse.persistence.jpa.PersistenceProvider.getProviderUtil()Ljavax/persistence/spi/ProviderUtil;" the class loader (instance of org/apache/catalina/loader/WebappClassLoader) of the current class, org/eclipse/persistence/jpa/PersistenceProvider, and the class loader (instance of org/apache/catalina/loader/StandardClassLoader) for interface javax/persistence/spi/PersistenceProvider have different Class objects for the type javax/persistence/spi/ProviderUtil used in the signature </code></pre> <p>Play with hibernate3.jar, eclipselink.jar, persistence.jar until exhaustion, and realize Liferay is grinning at you.</p> <p>How would you erase that irritating smile from Liferay's face? In other words, </p> <p><strong>How can I get a JPA provider instantiated in a spring context within a portlet plugin in liferay 6.1.20 without getting a classloader error?</strong></p>
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    1. USGabriel
    1. USGabriel
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    1. COwild guess: sounds like you either have some code twice on the classpath or code that assumes a different JRE than you are using. If you look at the classpath, look at what's available to tomcat after deployment, not in your source project.
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      1. POLiferay JPA ClassLoader Error
      1. USOlaf Kock
    2. COLiferay manages the dependencies and classloaders on its own, I have no control over that. I already tried playing moving or removing the jars that could be causing the problem :(
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      1. USGabriel
    3. CObut if you find out that something ends up twice on the classpath, we can see how to mitigate that. At least the injections at deployment (e.g. when you use the Liferay deploy folder) are transparent and get added to WEB-INF/lib
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      1. POLiferay JPA ClassLoader Error
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