使用子类对象执行Spring Rest Post时发生java 400错误

Question

我越来越 从子类对象到超类引用执行Spring Rest Post时出现400错误

jUnit测试：-（失败）

SubClass subClassObj = new SubClass();
restTemplate.postForObject(restURL, subClassObj, SubClass.class);

弹簧控制器方法：-

@RequestMapping(method = RequestMethod.POST, value =
 "/post-subclass-obj", headers = "Accept=application/json") 

public @ResponseBody SuperClass postSubClassObj(@RequestBody SuperClass
 superClassObj) { 

        return superClassObj;
}

jUnit测试：-（它可以工作）

SuperClass superClassObj = new SuperClass();
restTemplate.postForObject(restURL, superClassObj, SubClass.class);

提前谢谢