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我已经创建了小OSGI buldle项目与JPA2.0支持，坚持学生（实体类）对象。与JPA支持OSGI bunfle没有持久性提供程序错误
我将能够成功启动此服务。
我已经创造了另一个客户端包项目访问此服务。当我尝试启动客户端buldle服务我流汗波纹错误
产生的原因：javax.persistence.PersistenceException：否EntityManager的持久性提供者名为StudentJPAService
请找到完整的堆栈跟踪波纹管
!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
我可以在下面的文章中看到同样的问题，但它并没有帮助我解决我的问题。
OSGi + JPA(postgresql)
请帮我解决这个问题。
感谢您的帮助。你有什么想法，我们可以使用这些接口的引擎？ – 2013-03-04 11:04:00
是的，有几个ORM实现JPA。一些例子是：Hibernate，EclipseLink，TopLink或OpenJPA。我认为最受欢迎的是Hibernate和EclipseLink。 Hibernate是最流行，功能强大且灵活的ORM，但它也是最重的，也是最难学的。另一方面EclipseLink是一个轻量级的ORM，但它不像休眠那样强大。 – 2013-03-04 11:24:24
你可以看看下一期：http://stackoverflow.com/questions/2569522/hibernate-or-eclipselink – 2013-03-04 11:30:23