Re: RE: trouble with instrumenting interdependent classes

Hi,

@ Tim - Based on my analysis, I  can conclude am not facing the problem scenario you have reported. Besides, shouldn't the VM resolve all the dependency before loading a class.


However I noticed something strange. Since I'm in development phase, I keep the CheckClassAdapter in between before returning the transformed byte-code. If I remove this adapter everything works fine. I haven't got the time to analyze further in this regard.


Will post if I find out something.


Thanks,
Rajaraman




---- On Fri, 01 Apr 2011 23:47:15 +0530 Tim Eck <[email protected]> wrote ---- 


Can't tell for sure if this is what is happening to you but I'm fairly 
certain class transformers are not-reentrant unfortunately. So if in the 
middle of your transform() method you end up loading a class that would 
end up calling back into the same transformer it will just get skipped -- 
it is a very annoying "feature". I'd google around on this for more 
information and possible workarounds. 
 
I think one hack is to use another thread since the flag for this is 
thread local I believe. 
 
If you are indeed hitting this problem and find a solution/workaround 
please report back 
 
Good luck 
 
-----Original Message----- 
From: [email protected] [mailto:[email protected]] 
Sent: Friday, April 01, 2011 2:43 AM 
To: [email protected] 
Subject: [asm] trouble with instrumenting interdependent classes 
 
Hi, 
 
I'm facing an issue while instrumenting two classes that are 
interdependent. 
 
The classes in dispute are com/mysql/jdbc/ConnectionImpl & 
com/mysql/jdbc/PreparedStatement. I'm instrumenting the method 
ConnectionImpl.prepareStatement() which returns an instance of 
PreparedStatement. There is also a rule defined to instrument certain 
methods 
in PreparedStatement. 
 
My ClassFileTransformer implementation is not called at all while loading 
PreparedStatement whenever I instrument ConnectionImpl. However, if I 
disable 
instrumenting ConnectionImpl everything seems to work fine! 
 
Any special case I have to handle here? or am I missing something here? 
 
thanks, 
ramanr

-- 
You receive this message as a subscriber of the [email protected] mailing list.
To unsubscribe: mailto:[email protected]
For general help: mailto:[email protected]?subject=help
OW2 mailing lists service home page: http://www.ow2.org/wws