org.apache.openjpa.kernel.Bootstrap uses the application classloader to load
OpenJPA internals
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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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