Re: ClassWriter.COMPUTE_FRAMES & Stack size too large

You must call visitMaxs before visitEnd. Just pass 0, 0.

On Jul 26, 2010, at 5:43 PM, Bhaskar Maddala <[email protected]> wrote:

> Hello,
> 
>  I was playing around with ASM and as  a newbie cannot seem to figure
> out what I am doing wrong in the following code
> 
> public class VarianceOnReturnTypeGenerator {
>    public static void main(String[] args) throws Exception {
>        Class<?> clazz = writeClass();
>        Object o = clazz.newInstance();
>    }
> 
>    private static Class<?> writeClass() {
>        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
> 
>        cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, "OverriddenMethods", null,
>                "java/lang/Object", null);
>        writeConstructor(cw);
>        cw.visitEnd();
>        GeneratedClassLoader gcl = new GeneratedClassLoader();
>        return gcl.defineClass("OverriddenMethods", cw.toByteArray());
>    }
> 
>    private static void writeConstructor(ClassWriter cw) {
>        MethodVisitor mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null,
>                null);
>        mv.visitCode();
>        mv.visitVarInsn(ALOAD, 0);
>        mv.visitMethodInsn(INVOKESPECIAL, "java/lang/Object", "<init>", "()V");
>        mv.visitInsn(RETURN);
>        mv.visitEnd();
>    }
> }
> 
> When attempting to create an instance of the object using newInstance,
> I get the following exception
> 
> Exception in thread "main" java.lang.VerifyError: (class:
> OverriddenMethods, method: <init> signature: ()V) Stack size too large
>    at java.lang.Class.getDeclaredConstructors0(Native Method)
> 
> Pointers much appreciated.
> 
> Thanks
> Bhaskar
> 
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