Re: Stack size too large

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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