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From "Jason Zheng (JIRA)" <j...@apache.org>
Subject [jira] Commented: (OPENJPA-600) java.lang.NoClassDefFoundError is thrown when using JRocket and application-provided OpenJPA jars
Date Tue, 13 May 2008 18:59:55 GMT

    [ https://issues.apache.org/jira/browse/OPENJPA-600?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12596498#action_12596498
] 

Jason Zheng commented on OPENJPA-600:
-------------------------------------

The patch, OPENJPA-600.txt,  is based on:

OpenJPA 1.1.0-SNAPSHOT
version id: openjpa-1.1.0-SNAPSHOT-r422266:653176M

Jason

> java.lang.NoClassDefFoundError is thrown when using JRocket and application-provided
OpenJPA jars
> -------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-600
>                 URL: https://issues.apache.org/jira/browse/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
>         Attachments: OPENJPA-600.txt
>
>
> 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 kodo.*.
> 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(PCClassFileTransformer.java:127)
> 	at org.apache.openjpa.persistence.PersistenceProviderImpl$ClassTransformerImpl.transform(PersistenceProviderImpl.java:201)
> 	at weblogic.deployment.PersistenceUnitInfoImpl$ClassPreProcessorImpl.preProcess(PersistenceUnitInfoImpl.java:490)
> 	at weblogic.utils.classloaders.ClassPreProcessor$ClassPreProcessorSupport.preProcess(ClassPreProcessor.java:95)
> 	at weblogic.utils.classloaders.GenericClassLoader.doPreProcess(GenericClassLoader.java:351)
> 	at weblogic.utils.classloaders.GenericClassLoader.defineClass(GenericClassLoader.java:332)
> 	at weblogic.utils.classloaders.GenericClassLoader.findLocalClass(GenericClassLoader.java:291)
> 	at weblogic.utils.classloaders.GenericClassLoader.findClass(GenericClassLoader.java:259)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
> 	at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
> 	at weblogic.utils.classloaders.GenericClassLoader.loadClass(GenericClassLoader.java:179)
> 	at java.lang.Class.getDeclaredMethods0(Native Method)
> 	at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
> 	at java.lang.Class.privateGetPublicMethods(Class.java:2547)
> 	at java.lang.Class.getMethods(Class.java:1410)
> 	at weblogic.ejb.container.ejbc.VersionHelperImpl.computeCRC(VersionHelperImpl.java:350)
> 	at weblogic.ejb.container.ejbc.VersionHelperImpl.makeFileHash(VersionHelperImpl.java:268)
> 	at weblogic.ejb.container.ejbc.VersionHelperImpl.<init>(VersionHelperImpl.java:78)
> 	at weblogic.ejb.container.deployer.EJBDeployer.compileIfNecessary(EJBDeployer.java:521)
> 	at weblogic.ejb.container.deployer.EJBDeployer.prepare(EJBDeployer.java:1154)
> 	at weblogic.ejb.container.deployer.EJBModule.prepare(EJBModule.java:400)
> 	at weblogic.application.internal.flow.ModuleListenerInvoker.prepare(ModuleListenerInvoker.java:93)
> 	at weblogic.application.internal.flow.DeploymentCallbackFlow$1.next(DeploymentCallbackFlow.java:385)
> 	at weblogic.application.utils.StateMachineDriver$ParallelChange$1.run(StateMachineDriver.java:71)
> 	at weblogic.security.acl.internal.AuthenticatedSubject.doAs(AuthenticatedSubject.java:321)
> 	at weblogic.security.service.SecurityManager.runAs(Unknown Source)
> 	at weblogic.application.utils.StateMachineDriver$ParallelChange.run(StateMachineDriver.java:79)
> 	at java.lang.Thread.run(Thread.java:619)
> 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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