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POHow to make PostgreSQL work with OSGi using EclipseLink
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  1. POHow to make PostgreSQL work with OSGi using EclipseLink
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    copied!<p>I need to develop a OSGi bundle with EclipseLink, which should connect to PostgreSQL, but I wasted a bunch of time and could not make it work. I receive this "javax.persistence.PersistenceException: No Persistence provider for EntityManager named rooms".</p> <p>Basically, I followed the steps of tutorials I found on the web. I use Eclipse Indigo</p> <pre><code>Manifest file : Manifest-Version: 1.0 Meta-Persistence: persistence.xml JPA-PersistenceUnits: rooms Bundle-ClassPath: ., META-INF/persistence.xml Bundle-ManifestVersion: 2 Bundle-Name: PMSTestTask Bundle-SymbolicName: PMSTestTask Bundle-Version: 1.0.0.qualifier Bundle-Activator: pmstesttask.Activator Bundle-ActivationPolicy: lazy Bundle-RequiredExecutionEnvironment: JavaSE-1.6 Import-Package: javax.persistence;version="2.0.3", org.osgi.framework;version="1.3.0", org.postgresql Require-Bundle: org.eclipse.persistence.jpa;bundle-version="2.1.0", org.eclipse.persistence.jpa.osgi;bundle-version="2.3.0" </code></pre> <p>persistence.xml</p> <pre><code> &lt;?xml version="1.0" encoding="UTF-8" ?&gt; &lt;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" version="2.0" xmlns="http://java.sun.com/xml/ns/persistence"&gt; &lt;persistence-unit name="rooms" transaction-type="RESOURCE_LOCAL"&gt; &lt;provider&gt;org.eclipse.persistence.jpa.PersistenceProvider&lt;/provider&gt; &lt;class&gt;test_task.domain.Room&lt;/class&gt; &lt;properties&gt; &lt;property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver" /&gt; &lt;property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/Hotel_test_task" /&gt; &lt;property name="javax.persistence.jdbc.user" value="" /&gt; &lt;property name="javax.persistence.jdbc.password" value="" /&gt; &lt;/properties&gt; &lt;/persistence-unit&gt; &lt;/persistence&gt; </code></pre> <p>Activator.java</p> <pre><code> EntityManagerFactory emf = Persistence .createEntityManagerFactory("rooms"); EntityManager em = emf.createEntityManager(); </code></pre> <p>Update. 0</p> <p>Added required-bundle to manifest. And got this </p> <pre><code>org.osgi.framework.BundleException: The bundle "org.eclipse.persistence.jpa.osgi_2.3.0.v20110604-r9504 [26]" could not be resolved. Reason: Missing Constraint: Require-Bundle: org.eclipse.persistence.core; bundle-version="2.3.0" </code></pre>
 

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