Re: Transforming classes from an agent, as per the example in the asm-guide.pdf

On Thu, Apr 22, 2010 at 7:55 PM, Stanislav Paskalev <[email protected]> wrote:
> Hello,
>
> I'm having an issue with this code and any help will be appreciated :)
>
> http://pastebin.com/c8Hpdbp4 - the transform(...) method
> http://pastebin.com/UqXLZ6xD - the class modifying adapter
> http://pastebin.com/145GzSzG - the method modifying adapter.
>
> Forgive the fantasy names, I can't seem to get it working after the
> transform() method. Calls to transforms do happen every time the jvm
> loads a class, however when it hits the first line of it during debug
> (with the class reader), it seems to completely leave this and instead
> gets at
>        TransformerManager.transform(ClassLoader, String, Class,
> ProtectionDomain, byte[]) line: 175
>        InstrumentationImpl.transform(ClassLoader, String, Class,
> ProtectionDomain, byte[], boolean) line: 365
>        Signal.dispatch(int) line: 189

What is it?  Call stack?  It might be good if you can paste full call
stack here.

>
> If I place a breakpoint at the second line of the transform method -
> it's never reached.
>
> The pdf suggested doing it this way, but something isn't right by me.

To be honest, I don't understand your problem.

>
> I'm loading my agent in a jvm running jboss and some j2ee-based custom
> applications.
>
> (also, as a side question - can I use asm to redefine classes from the
> java runtime ?)
Yes, you can do that.

http://lamp.epfl.ch/java/jdk1.6/docs/api/java/lang/instrument/package-summary.html

>
> Thanks for reading all of this!
>
> Regards,
> Stanislav Paskalev
>
>
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>



-- 
Yao Qi <qiyaoltc AT gmail DOT com>    GNU/Linux Developer
http://duewayqi.googlepages.com/

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