title: No Persistence provider error for the OSGI bunfle with JPA support
body: <p>I have created small OSGI buldle project with the JPA2.0 support to persist the Student(Entity class) Object.</p>
  
  <p>I would be able to start this service successfully.</p>
  
  <p>I have created another client bundle project to access this service. When I try to start the client buldle service I am gettting the bellow error</p>
  
  <p><strong>Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named StudentJPAService</strong></p>
  
  <p><strong>Please find the full stacktrace bellow</strong></p>
  
  <pre><code>!ENTRY StudentJPAClient 4 0 2013-03-04 14:17:21.846
  !MESSAGE FrameworkEvent ERROR
  !STACK 0
  org.osgi.framework.BundleException: Exception in student.jpaclient.Activator.start() of bundle StudentJPAClient.
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:734)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
      at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
      at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:390)
      at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1176)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:559)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:544)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:457)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:438)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:1)
      at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
      at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
  Caused by: java.lang.ExceptionInInitializerError
      at com.student.jpaservice.serviceimpl.StudentDAOService.persist(StudentDAOService.java:16)
      at student.jpaclient.Activator.start(Activator.java:30)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
      ... 12 more
  Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named StudentJPAService
      at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
      at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
      at com.student.jpaservice.util.StudentUtil.&lt;clinit&gt;(StudentUtil.java:11)
      ... 17 more
  Root exception:
  java.lang.ExceptionInInitializerError
      at com.student.jpaservice.serviceimpl.StudentDAOService.persist(StudentDAOService.java:16)
      at student.jpaclient.Activator.start(Activator.java:30)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:711)
      at java.security.AccessController.doPrivileged(Native Method)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:702)
      at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:683)
      at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:381)
      at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:390)
      at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1176)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:559)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:544)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:457)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:438)
      at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:1)
      at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:230)
      at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:340)
  Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named StudentJPAService
      at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
      at javax.persistence.Persistence.createEntityManagerFactory(Unknown Source)
      at com.student.jpaservice.util.StudentUtil.&lt;clinit&gt;(StudentUtil.java:11)
      ... 17 more
  </code></pre>
  
  <p><strong>MANIFEST.MF</strong></p>
  
  <pre><code>Manifest-Version: 1.0
  Bundle-ManifestVersion: 2
  Bundle-Name: StudentJPAService
  Bundle-SymbolicName: StudentJPAService;singleton:=true
  Bundle-Version: 1.0.0.qualifier
  Bundle-Activator: com.student.jpaservice.actovator.Activator
  Import-Package: javax.persistence;version="1.1.0",
   org.osgi.framework
  Bundle-RequiredExecutionEnvironment: JavaSE-1.6
  Export-Package: com.student.jpaservice.actovator,
   com.student.jpaservice.model,
   com.student.jpaservice.service,
   com.student.jpaservice.serviceimpl,
   com.student.jpaservice.util
  Bundle-ActivationPolicy: lazy
  Meta-Persistence: META-INF/persistence.xml
  Bundle-ClassPath: ../lib/j2ee.jar,
   ../lib/javax.j2ee.persistence.jar,
   ../lib/mysql-connector-java-5.1.7-bin.jar,
   .
  JPA-PersistenceUnits: StudentJPAService
  </code></pre>
  
  <p>I can see the same problem in bellow post, But It didnt help me to solve my issue.<br>
  <a href="https://stackoverflow.com/questions/7879827/osgi-jpapostgresql">OSGi + JPA(postgresql)</a></p>
  
  <p>Please help me to resolve this issue.</p>