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https://issues.apache.org/jira/browse/OPENJPA-1454?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12797296#action_12797296
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Mark Struberg commented on OPENJPA-1454:
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yes and no ;)
I inject the EntityManager myself via OpenWebBeans, but use an extended EM
(Persistence.createEntityManagerFactory())
The EntityManager gets created via a @Producer, thus lazy initialised in the
WebappClassLoader realm.
> 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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