Retrieving the object reference of the return value or exception in onMethodExit

Since the top element of the stack contains the return value or the exception instance, I tried to retrieve them in onMethodExit, but it resulted in stack exception. Please advice.

protected void onMethodExit(int opcode){

     if (opcode == ATHROW){
         mv.visitInsn(DUP);
         mv.visitVarInsn(ASTORE, exceptionIndex);      // Stores exception in local variable
     }
    else {
         mv.visitInsn(ACONST_NULL);
         mv.visitVarInsn(ASTORE, exceptionIndex);       
         if (opcode == ARETURN) {
            mv.visitInsn(DUP);
            mv.visitVarInsn(ASTORE, returnValueIndex);   // Stores return value in local variable
         }
    }
   mv.visitVarInsn(ALOAD, myClassIndex);              
   mv.visitVarInsn(ALOAD, exceptionIndex);              // passes them to MyClass
   mv.visitVarInsn(ASTORE, returnValueIndex);        
   mv.visitMethodInsn(INVOKEVIRTUAL, "com/bv/MyClass", "myMethod", "(Ljava/lang/Throwable;Ljava/lang/Object;)V");

Thanks

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