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From "Jason Zheng (JIRA)" <>
Subject [jira] Created: (OPENJPA-600) java.lang.NoClassDefFoundError is thrown when using JRocket and application-provided OpenJPA jars
Date Tue, 13 May 2008 18:43:55 GMT
java.lang.NoClassDefFoundError is thrown when using JRocket and application-provided OpenJPA

                 Key: OPENJPA-600
             Project: OpenJPA
          Issue Type: Bug
          Components: kernel
    Affects Versions: 1.1.0
         Environment: Runtime enhancement in combination with a pure-JIT JVM such as JRocket
            Reporter: Jason Zheng

Customers want to use a version of OpenJPA in their applications other than the version bundled
with WebLogic. It enables customers to use an upgraded version of OpenJPA than is shipped
with the product. 

The customer's application would have openjpa.jar and kodo.jar in its lib or APP-INF/lib directory,
and use the filtering classloader to filter out org.apache.openjpa.*, com.solarmetric.* and

When I deploy a sample application with embedded openjpa.jar to weblogic server, the following
exception is thrown during deployment:

java.lang.NoClassDefFoundError: org/apache/openjpa/enhance/PCEnhancer
	at org.apache.openjpa.enhance.PCClassFileTransformer.transform(
	at org.apache.openjpa.persistence.PersistenceProviderImpl$ClassTransformerImpl.transform(
	at weblogic.deployment.PersistenceUnitInfoImpl$ClassPreProcessorImpl.preProcess(
	at weblogic.utils.classloaders.ClassPreProcessor$ClassPreProcessorSupport.preProcess(
	at weblogic.utils.classloaders.GenericClassLoader.doPreProcess(
	at weblogic.utils.classloaders.GenericClassLoader.defineClass(
	at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(
	at weblogic.utils.classloaders.GenericClassLoader.findClass(
	at java.lang.ClassLoader.loadClass(
	at java.lang.ClassLoader.loadClass(
	at weblogic.utils.classloaders.GenericClassLoader.loadClass(
	at java.lang.Class.getDeclaredMethods0(Native Method)
	at java.lang.Class.privateGetDeclaredMethods(
	at java.lang.Class.privateGetPublicMethods(
	at java.lang.Class.getMethods(
	at weblogic.ejb.container.ejbc.VersionHelperImpl.computeCRC(
	at weblogic.ejb.container.ejbc.VersionHelperImpl.makeFileHash(
	at weblogic.ejb.container.ejbc.VersionHelperImpl.<init>(
	at weblogic.ejb.container.deployer.EJBDeployer.compileIfNecessary(
	at weblogic.ejb.container.deployer.EJBDeployer.prepare(
	at weblogic.ejb.container.deployer.EJBModule.prepare(
	at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(
	at weblogic.application.internal.flow.DeploymentCallbackFlow$
	at weblogic.application.utils.StateMachineDriver$ParallelChange$
	at Source)
	at weblogic.application.utils.StateMachineDriver$

Note this error happens in pure-JIT JVM such as JRocket only, not with the interpreting JVMs
(for instance HotSpot).

The error is because the tranformer plugin in openjpa makes a faulty assumption (which happens
to work on interpreters), that types can be 
resolved during execution of a method. Read up on the VM/lanf spec, it clearly states that
you may not make such an assumption. Thus, while it might work with the reference, the preprocessor
is quite broken.

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