final ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_FRAMES);
final String proxyClassFileName = getSubclassName(classToProxy).replace('.', '/');
final String classFileName = classToProxy.getName().replace('.', '/');
cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER, proxyClassFileName, null, classFileName, null);
cw.visitSource(classFileName + ".java", null);
// push InvocationHandler field
cw.visitField(ACC_FINAL + ACC_PRIVATE, "this$handler", "Ljava/lang/reflect/InvocationHandler;", null, null).visitEnd();