[ 
https://issues.apache.org/jira/browse/OPENJPA-1454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797350#action_12797350
 ] 

Mark Struberg commented on OPENJPA-1454:
----------------------------------------

@Rick here is an example stacktrace:

Caused by: java.lang.ClassNotFoundException: 
org.apache.openjpa.lib.util.Closeable
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
        at java.lang.ClassLoader.defineClass1(Native Method)
        at java.lang.ClassLoader.defineClass(ClassLoader.java:616)
        at 
java.security.SecureClassLoader.defineClass(SecureClassLoader.java:124)
        at java.net.URLClassLoader.defineClass(URLClassLoader.java:260)
        at java.net.URLClassLoader.access$000(URLClassLoader.java:56)
        at java.net.URLClassLoader$1.run(URLClassLoader.java:195)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1302)
        at 
org.apache.catalina.loader.WebappClassLoader.loadClass(WebappClassLoader.java:1233)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryImpl.setBrokerFactory(EntityManagerFactoryImpl.java:95)
        at 
org.apache.openjpa.persistence.EntityManagerFactoryValue.newFactory(EntityManagerFactoryValue.java:53)
        at 
org.apache.openjpa.persistence.JPAFacadeHelper.toEntityManagerFactory(JPAFacadeHelper.java:75)
        at 
org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:109)
        at 
org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:151)
        at 
org.apache.openjpa.persistence.PersistenceProviderImpl.createEntityManagerFactory(PersistenceProviderImpl.java:59)
        at 
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:150)
        at 
javax.persistence.Persistence.createEntityManagerFactory(Persistence.java:70)
        at 
org.apache.webbeans.resource.spi.se.ResourceServiceImpl.getPersistenceUnit(ResourceServiceImpl.java:111)
        at 
org.apache.webbeans.resource.spi.se.ResourceServiceImpl.getPersistenceContext(ResourceServiceImpl.java:125)
        at 
org.apache.webbeans.resource.spi.se.ResourceServiceImpl.getResource(ResourceServiceImpl.java:59)
        at 
org.apache.webbeans.resource.OpenWebBeansResourcePlugin.injectResources(OpenWebBeansResourcePlugin.java:61)
        at 
org.apache.webbeans.component.AbstractInjectionTargetBean.postConstructDefault(AbstractInjectionTargetBean.java:230)
        at 
org.apache.webbeans.component.AbstractInjectionTargetBean.postConstruct(AbstractInjectionTargetBean.java:213)
        at 
org.apache.webbeans.component.AbstractInjectionTargetBean.afterConstructor(AbstractInjectionTargetBean.java:199)
        at 
org.apache.webbeans.component.AbstractInjectionTargetBean.createDefaultInstance(AbstractInjectionTargetBean.java:136)


And this is the Instrumentation part. Please note that only openjpa-kernel gets 
injected into the root classpath as agent-jar, thus the lib.log.Log causes the 
clash.

Exception in thread "Attach Listener" java.lang.NoClassDefFoundError: 
org/apache/openjpa/lib/log/Log
        at java.lang.Class.getDeclaredMethods0(Native Method)
        at java.lang.Class.privateGetDeclaredMethods(Class.java:2427)
        at java.lang.Class.getMethod0(Class.java:2670)
        at java.lang.Class.getMethod(Class.java:1603)
        at 
sun.instrument.InstrumentationImpl.loadClassAndStartAgent(InstrumentationImpl.java:294)
        at 
sun.instrument.InstrumentationImpl.loadClassAndCallAgentmain(InstrumentationImpl.java:348)
Caused by: java.lang.ClassNotFoundException: org.apache.openjpa.lib.log.Log
        at java.net.URLClassLoader$1.run(URLClassLoader.java:200)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.net.URLClassLoader.findClass(URLClassLoader.java:188)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:303)
        at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
        at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:316)
        ... 6 more
Agent failed to start!


txs and LieGrue,
strub

> InstrumentationFactory crashes the tomcat WebappClassLoader by injecting 
> org.apache.openjpa classes into the SystemClassLoader
> ------------------------------------------------------------------------------------------------------------------------------
>
>                 Key: OPENJPA-1454
>                 URL: https://issues.apache.org/jira/browse/OPENJPA-1454
>             Project: OpenJPA
>          Issue Type: Bug
>          Components: UnenhancedClasses
>    Affects Versions: 2.0.0-M3
>            Reporter: Mark Struberg
>
> The InstrumentationFactory tries to find the jar containing the manifest with 
> the pre-main and attaches this jar to the VM.
> This has the side effect that all classes which get loaded via the 
> Instrumentation are added to the 'classes' Vector of the SystemClassLoader. 
> And this causes a problem when running OpenJPA in a WebApplication - because 
> the SystemClassLoader only contains a few of those class definitions, and 
> e.g. executing     
> public void setBrokerFactory(BrokerFactory factory) {
>         _factory = new DelegatingBrokerFactory(factory,
>             PersistenceExceptions.TRANSLATOR);
>     }
> crashes the WebApp because org.apache.openjpa.util.Exceptions is available in 
> the SystemClassLoader but the dependent J2DoPrivHelper is not.
> This is even more problematic when using openjpa-lib, openjpa-kernel, etc as 
> single jars (instead of openjpa-all), because in this case only 
> openjpa-kernel gets injected into the VMs  system classpath - causing the 
> agent to subsequently crash because all the classes from openjpa-lib 
> obviously cannot be found. 
> This might also be an explanation to a few other open JIRAs I've read through 
> the last few days.

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