Re: Re: Stack size too large

I had made a mistake on assigning the label for visitTryCatchBlock. On checking the cause for NPE in MethodWriter code, I went back and checked my code and I have assigned the same label for both end & exception handler!

---- On Thu, 11 Nov 2010 07:20:07 +0530 Yao Qi <[email protected]> wrote ---- 

On Mon, Nov 8, 2010 at 9:18 PM, Rajaraman Santhanam <[email protected]> wrote: 
> Hi, 
> Getting Stack size too large error on inserting some code. 
> 
> java.lang.VerifyError: (class: org/apache/catalina/servlets/DefaultServlet, 
> method: doGet signature: 
> (Ljavax/servlet/http/HttpServletRequest;Ljavax/servlet/http/HttpServletResponse;)V) 
> Stack size too large 
> 
> My class writer is invoked as below: 
> 
> ClassWriter writer = new ClassWriter(reader, ClassWriter.COMPUTE_MAXS | 
> ClassWriter.COMPUTE_FRAMES); 
> 
> I'm getting the error: 
> 
> java.lang.NullPointerException 
>         at org.objectweb.asm.MethodWriter.visitMaxs(Unknown Source) 
>         at 
> com.manageengine.dpm.agent.instrumentation.BasicMethodAdapter.visitMaxs(BasicMethodAdapter.java:88) 
>         at org.objectweb.asm.ClassReader.accept(Unknown Source) 
>         at org.objectweb.asm.ClassReader.accept(Unknown Source) 
>         at 
> com.manageengine.dpm.agent.instrumentation.ClassTransformer.transform(ClassTransformer.java:93) 
> 
 
Looks like you get two errors, NPE and too-large-stack. Which one 
happens earlier? 
I suggest that we can solve two errors one by one. 
 
> BasicMethodAdapter is the class that extends AdviceAdapter. My 
> implementation is something similar to the FinallyAdapter as mentioned 
> in "Using ASM framework to implement common bytecode transformation 
> patterns" 
> Any pointer where the issue could be?? 
 
It is hard for us to figure out what is your problem unless you can show us what 
exactly you did. 
 
-- 
Yao Qi <qiyaoltc AT gmail DOT com> 
http://sites.google.com/site/duewayqi/

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