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POAbility to switch Persistence Unit dynamically within the application (JPA)
 

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    <p>My application data access layer is built using Spring and EclipseLink and I am currently trying to implement the following feature - Ability to switch the current/active persistence unit dynamically for a user. I tried various options and finally ended up doing the following. </p> <p>In the persistence.xml, declare multiple PUs. Create a class with as many EntityManagerFactory attributes as there are PUs defined. This will act as a factory and return the appropriate EntityManager based on my logic</p> <pre><code>public class MyEntityManagerFactory { @PersistenceUnit(unitName="PU_1") private EntityManagerFactory emf1; @PersistenceUnit(unitName="PU_2") private EntityManagerFactory emf2; public EntityManager getEntityManager(int releaseId) { // Logic goes here to return the appropriate entityManeger } } </code></pre> <p>My spring-beans xml looks like this..</p> <pre><code>&lt;!-- First persistence unit --&gt; &lt;bean class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" id="emFactory1"&gt; &lt;property name="persistenceUnitName" value="PU_1" /&gt; &lt;/bean&gt; &lt;bean class="org.springframework.orm.jpa.JpaTransactionManager" id="transactionManager1"&gt; &lt;property name="entityManagerFactory" ref="emFactory1"/&gt; &lt;/bean&gt; &lt;tx:annotation-driven transaction-manager="transactionManager1"/&gt; </code></pre> <p>The above section is repeated for the second PU (with names like emFactory2, transactionManager2 etc).</p> <p>I am a JPA newbie and I know that this is not the best solution. I appreciate any assistance in implementing this requirement in a better/elegant way!</p> <p>Thanks!</p>
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