Java方法上注解值修改不成功的问题

private synchronized  Map<Class<? extends Annotation>, Annotation> declaredAnnotations() {
        if (declaredAnnotations == null) {
            Executable root = getRoot();
            if (root != null) {
                declaredAnnotations = root.declaredAnnotations();
            } else {
                declaredAnnotations = AnnotationParser.parseAnnotations(
                    getAnnotationBytes(),
                    sun.misc.SharedSecrets.getJavaLangAccess().
                    getConstantPool(getDeclaringClass()),
                    getDeclaringClass());
            }
        }
        return declaredAnnotations;
    }

//
private Method root;

//
Executable getRoot() {
　　return root;
}

@SneakyThrows
public void changeAnnotation() {
    Method method_4_getMethods = this.getClass().getMethod("annotation");
    Options options_4_getMethods = method_4_getMethods.getAnnotationsByType(Options.class)[0];
    System.out.println(String.format("getMethods修改前：%d", options_4_getMethods.timeout()));
    changeTimeout(options_4_getMethods, 8888);
    System.out.println(String.format("getMethods修改后：%d", options_4_getMethods.timeout()));

    Method method_4_getDeclaredMethod = this.getClass().getDeclaredMethod("annotation");
    Options options_4_getDeclaredMethod = method_4_getDeclaredMethod.getAnnotationsByType(Options.class)[0];
    System.out.println(String.format("getDeclaredMethod修改前：%d", options_4_getDeclaredMethod.timeout()));
    changeTimeout(options_4_getDeclaredMethod, 9999);
    System.out.println(String.format("getDeclaredMethod修改前：%d", options_4_getDeclaredMethod.timeout()));
}

@SneakyThrows
private void changeTimeout(Options options, int timeout) {
    InvocationHandler invocationHandler = Proxy.getInvocationHandler(options);
    Field memberValues = invocationHandler.getClass().getDeclaredField("memberValues");
    memberValues.setAccessible(true);
    Map memberValuesMap = (Map) memberValues.get(invocationHandler);
    memberValuesMap.put("timeout", timeout);
}
@Options(timeout = -1)
public void annotation() {

}