Re: ClassWriter.COMPUTE_FRAMES & Stack size too large

Thank you, I did not think the call was necessary since I was using
COMPUTE_FRAMES. Will do it now.

-Bhaskar

On Mon, Jul 26, 2010 at 5:50 PM, Scott Vachalek <[email protected]> wrote:
> 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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