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From "Timothy Ward (JIRA)" <j...@apache.org>
Subject [jira] Created: (OPENJPA-1491) org.apache.openjpa.kernel.Bootstrap uses the application classloader to load OpenJPA internals
Date Mon, 01 Feb 2010 17:16:18 GMT
org.apache.openjpa.kernel.Bootstrap uses the application classloader to load OpenJPA internals
----------------------------------------------------------------------------------------------

                 Key: OPENJPA-1491
                 URL: https://issues.apache.org/jira/browse/OPENJPA-1491
             Project: OpenJPA
          Issue Type: Bug
          Components: integration
    Affects Versions: 2.0.0-beta
         Environment: OSGi
            Reporter: Timothy Ward


When attempting to create an EntityManagerFactory in an OSGi environment the org.apache.openjpa.kernel.Bootstrap
class attempts to instantiate a BrokerFactory using reflection. When the Bootstrap class attempts
to load this class it only ever uses the ClassLoader passed in by the PersistenceUnitInfo.
This means that the default broker (contained within OpenJPA) can never be loaded. The client
bundle should not have to import the internals of OpenJPA to make this work, so OpenJPA should
attempt to load the class using its own bundle classloader. This is the expected behaviour
for an OSGi bundle.

Additionally, the implementation uses Class.forName() which should be avoided in an OSGi envrionment
(to see why read http://blog.bjhargrave.com/2007/09/classforname-caches-defined-class-in.html
).

The following exception is generated when OpenJPA attempts to use the application classloader
to load an internal class.

<openjpa-2.0.0-SNAPSHOT-r422266:905001 fatal user error> org.apache.openjpa.persistence.ArgumentException:
Could not invoke the static newInstance method on the named factory class "<<openjpa-2.0.0-SNAPSHOT-r422266:905001
fatal user error> org.apache.openjpa.util.UserException: The named BrokerFactory "org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory"
is not valid.>".
	at org.apache.openjpa.kernel.Bootstrap.newBrokerFactory(Bootstrap.java:70)
	at org.apache.openjpa.persistence.PersistenceProviderImpl.getBrokerFactory(PersistenceProviderImpl.java:145)
	at org.apache.openjpa.persistence.PersistenceProviderImpl.createContainerEntityManagerFactory(PersistenceProviderImpl.java:180)
	at org.apache.openjpa.persistence.PersistenceProviderImpl.createContainerEntityManagerFactory(PersistenceProviderImpl.java:62)
	at org.apache.aries.jpa.container.impl.EntityManagerFactoryManager.createEntityManagerFactories(EntityManagerFactoryManager.java:227)
	at org.apache.aries.jpa.container.impl.EntityManagerFactoryManager.bundleStateChange(EntityManagerFactoryManager.java:121)
	at org.apache.aries.jpa.container.impl.PersistenceBundleManager.modifiedBundle(PersistenceBundleManager.java:197)
	at org.apache.aries.util.tracker.MultiBundleTracker$InternalBundleTracker.modifiedBundle(MultiBundleTracker.java:108)
	at org.osgi.util.tracker.BundleTracker$Tracked.customizerModified(BundleTracker.java:453)
	at org.osgi.util.tracker.AbstractTracked.track(AbstractTracked.java:237)
	at org.osgi.util.tracker.BundleTracker$Tracked.bundleChanged(BundleTracker.java:413)
	at org.eclipse.osgi.framework.internal.core.BundleContextImpl.dispatchEvent(BundleContextImpl.java:916)
	at org.eclipse.osgi.framework.eventmgr.EventManager.dispatchEvent(EventManager.java:220)
	at org.eclipse.osgi.framework.eventmgr.ListenerQueue.dispatchEventSynchronous(ListenerQueue.java:149)
	at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEventPrivileged(Framework.java:1350)
	at org.eclipse.osgi.framework.internal.core.Framework.publishBundleEvent(Framework.java:1301)
	at org.eclipse.osgi.framework.internal.core.BundleHost.stopWorker(BundleHost.java:490)
	at org.eclipse.osgi.framework.internal.core.AbstractBundle.suspend(AbstractBundle.java:546)
	at org.eclipse.osgi.framework.internal.core.Framework.suspendBundle(Framework.java:1098)
	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.suspendBundle(PackageAdminImpl.java:314)
	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.processDelta(PackageAdminImpl.java:460)
	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl.doResolveBundles(PackageAdminImpl.java:241)
	at org.eclipse.osgi.framework.internal.core.PackageAdminImpl$1.run(PackageAdminImpl.java:176)
	at java.lang.Thread.run(Thread.java:735)
Caused by: <openjpa-2.0.0-SNAPSHOT-r422266:905001 fatal user error> org.apache.openjpa.persistence.ArgumentException:
The named BrokerFactory "org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory" is not valid.
	at org.apache.openjpa.kernel.Bootstrap.getFactoryClass(Bootstrap.java:159)
	at org.apache.openjpa.kernel.Bootstrap.invokeFactory(Bootstrap.java:111)
	at org.apache.openjpa.kernel.Bootstrap.newBrokerFactory(Bootstrap.java:62)
	... 23 more
Caused by: java.lang.ClassNotFoundException: org.apache.openjpa.jdbc.kernel.JDBCBrokerFactory
	at java.lang.Class.forName(Class.java:169)
	at org.apache.openjpa.kernel.Bootstrap.getFactoryClass(Bootstrap.java:157)
	... 25 more

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