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POusing the MergingPersistenceUnitManager to load entity
 

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    <p>I have a project setup where i have a module which is present in the WEB-INF/lib folder of the parent war file. This module contains a persistence.xml and an entity which i need to be loaded when the JPA container loads during startup. Somehow i need to merge the persistence units of the war and the lib jar. the persistence.xml of my war is present in WEB-INF/classes/META-INF hence it would take WEB-INF/classes as the persistence root and wouldnt understand the entity from my lib jar. That i found out the hard way. </p> <p>I stumbled across multiple people suggesting solutions to this problem </p> <p><a href="http://ancientprogramming.blogspot.com/2007/05/multiple-persistencexml-files-and.html" rel="nofollow">http://ancientprogramming.blogspot.com/2007/05/multiple-persistencexml-files-and.html</a> And i also found out that there is Spring's Data-jpa project which has a MergingPersistenceUnitManager which will merge the class definitions of the entities. </p> <p>Here is my configuration </p> <pre><code>&lt;bean id="pum" class="org.springframework.data.jpa.support.MergingPersistenceUnitManager"&gt; &lt;property name="persistenceXmlLocations"&gt; &lt;list&gt; &lt;value&gt;classpath*:META-INF/persistence.xml&lt;/value&gt; &lt;/list&gt; &lt;/property&gt; &lt;property name="defaultDataSource" ref="dataSource"&gt;&lt;/property&gt; &lt;/bean&gt; &lt;bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"&gt; &lt;property name="dataSource" ref="dataSource" /&gt; &lt;property name="persistenceUnitName" value="LineManagement" /&gt; &lt;property name="persistenceUnitManager" ref="pum"&gt;&lt;/property&gt; &lt;property name="jpaVendorAdapter"&gt; &lt;bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"&gt; &lt;property name="generateDdl" value="false" /&gt; &lt;property name="showSql" value="false" /&gt; &lt;property name="databasePlatform" ref="cpsHibernateDialectClassName" /&gt; &lt;/bean&gt; &lt;/property&gt; </code></pre> <p>which doesnt work. It gives me an error <code>java.lang.NoSuchMethodError:org.springframework.data.jpa.support.MergingPersistenceUnitManager.getPersistenceUnitInfo(Ljava/lang/String;)Lorg/springframework/orm/jpa/persistenceunit/MutablePersistenceUnitInfo;</code></p> <p>I have no clue how it gives me this error. From my understanding the MergingPersistenceUnitManager extends the DefaultPersistenceManager. Only thing i suspect is that there might be a conflict. </p> <p>Here are my dependencies. spring-orm-3.0.2-RELEASE.jar and spring-data-jpa-1.0.3-RELEASE.jar.</p> <p>I can go back to the ancient programming solution, but shouldnt it just work out of the box?</p>
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