错误原因controller层 没有加@ResponseBody
加上就不会报错了
@RequestMapping(value = "/insert", method = RequestMethod.GET, produces = "application/json; charset=utf-8")
@ResponseBody
public Integer insertUser(User user){
return userDao.insertUser(user);
}
java.lang.IllegalArgumentException: Unknown return value type: java.lang.Integer] with root cause
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转载自blog.csdn.net/qq_39326137/article/details/81367510
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