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[eclipselink-users] Question about createEntityManagerFactory
Hi, everyone.
I'm using eclipselink under an OSGi environment.
My code is as follows:

EntityManager em = Persistence.createEntityManagerFactory("checkpoint").createEntityManager();

I also had a file named "javax.persistence.spi.PersistenceProvider" under the directory "META-INF/services", with the only line "org.eclipse.persistence.jpa.PersistenceProvider" in it, and a file named "persistence.xml" under the directory"META-INF/", the content of which is as follows:

<?xml version="1.0" encoding="UTF-8"?>
<persistence xmlns="http://java.sun.com/xml/ns/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="1.0">

<persistence-unit name="checkpoint" transaction-type="RESOURCE_LOCAL">
<properties>
<property name="eclipselink.jdbc.url" value="jdbc:mysql://localhost/secsuite_core" />
<property name="eclipselink.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="eclipselink.jdbc.user" value="root" />
<property name="eclipselink.jdbc.password" value="root" />
<property name="eclipselink.logging.level" value="OFF" />
<property name="eclipselink.ddl-generation" value="create-tables" />
</properties>
</persistence-unit>

</persistence>

When I tried to run the program, I got the following exception:

org.osgi.framework.BundleException: Exception in jpa_test.Activator.start() of bundle jpa_test.
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:806)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:374)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1067)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:561)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:546)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:459)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:440)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:227)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:337)
Caused by: javax.persistence.PersistenceException: No Persistence provider for EntityManager named checkpoint
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:84)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
at jpa_test.Activator.start(Activator.java:44)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
... 11 more
Root exception:
javax.persistence.PersistenceException: No Persistence provider for EntityManager named checkpoint
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:84)
at javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:54)
at jpa_test.Activator.start(Activator.java:44)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl$1.run(BundleContextImpl.java:783)
at java.security.AccessController.doPrivileged(Native Method)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.startActivator(BundleContextImpl.java:774)
at org.eclipse.osgi.framework.internal.core.BundleContextImpl.start(BundleContextImpl.java:755)
at org.eclipse.osgi.framework.internal.core.BundleHost.startWorker(BundleHost.java:370)
at org.eclipse.osgi.framework.internal.core.AbstractBundle.resume(AbstractBundle.java:374)
at org.eclipse.osgi.framework.internal.core.Framework.resumeBundle(Framework.java:1067)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:561)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.resumeBundles(StartLevelManager.java:546)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.incFWSL(StartLevelManager.java:459)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.doSetStartLevel(StartLevelManager.java:243)
at org.eclipse.osgi.framework.internal.core.StartLevelManager.dispatchEvent(StartLevelManager.java:440)
at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:227)
at org.eclipse.osgi.framework.eventmgr.EventManager$EventThread.run(EventManager.java:337)

I debugged into the JPA code, it seems that the problem is in the method javax.persistence.spi.PersistenceProviderResolverHolder.DefaultPersistenceProviderResolver.getProviderNames().
It seems that although the classloader retrieved using Thread.currentThread().getContextClassLoader() is the same classloader as that of my bundle, it always try to load resources from the bundle that contains the class "javax.persistence.spi.PersistenceProviderResolverHolder" 

How should I deal with this problem? I'm looking forward to the answer, thank you very much:-)

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