Re: Cross ClassLoader instrumentation issue

Hi All,

sorry for reposting the message. I haven't received any reply yet, and I
wonder if it is because my question is vague or because no one has had a
similar experience before?

-Nemo

On Tue, Nov 9, 2010 at 11:52 PM, Nemo Caviani <[email protected]>wrote:

> Hi all,
>
> I have a rather complicated problem that I am trying to deal with.
>
> I am doing binary rewriting within the context of Spring DM and the issue
> that I am dealing with is that several instances of an overwritten
> ClassLoader load different classes in the application. So, when I am doing
> binary rewriting some classes are not available for the class loader whose
> class byte code is being rewritten. This corrupts the overwritten bytecode
> for the instrumented class and when I check it with the CheckClassAdapter
> verifier, I receive exceptions similar to the following:
>
> org.objectweb.asm.tree.analysis.AnalyzerException: Error at instruction
> 392: java.lang.ClassNotFoundException: org.hibernate.HibernateException
>
> when checking the Class loader IDs for which the classes are being loaded,
> I see the following
>
> org.apache.felix.framework.ModuleImpl$ModuleClassLoader 8993129 ::
> Auth.class
> org.apache.felix.framework.ModuleImpl$ModuleClassLoader 16865950
> :: org.hibernate.HibernateException
>
> "Auth.class" is loaded via a ModuleClassLoader instance whose hashcode
> is 8993129 whereas the instance loading
> "org.hibernate.HibernateException.class" has the hashcode 16865950
> (Basically 2 different instances)
>
> I wonder if there is any way to get the ClassAdapter to do late binding
> when resolving dependencies? or if not, could anyone think of any solution?
>
> One possibility that I have been thinking about is to exhaustively find all
> the classes  in the byte code of the class being overwritten and create some
> proxies or interfaces for them to resolve the dependencies but this is
> insanely expensive and fairly complicated. I very much appreciate inputs
> from you guys.
>
> thanks a lot,
> Nemo
>

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