I have created small OSGI buldle project with the JPA2.0 support to persist the Student(Entity class) Object.

I would be able to start this service successfully.

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

**Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named StudentJPAService**

**Please find the full stacktrace bellow**

```
!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.<clinit>(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.<clinit>(StudentUtil.java:11)
    ... 17 more

```

**MANIFEST.MF**

```
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

```

I can see the same problem in bellow post, But It didnt help me to solve my issue.  

[OSGi + JPA(postgresql)](https://stackoverflow.com/questions/7879827/osgi-jpapostgresql)

Please help me to resolve this issue.