InstrumentationFactory crashes the tomcat WebappClassLoader by injecting
org.apache.openjpa classes into the SystemClassLoader
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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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