老师后面我又出现了这样的问题
int result = appUserMapper.updateByPrimaryKeySelective(userInfo); 这里更新也是 null
WARN o.s.w.s.m.m.a.ExceptionHandlerExceptionResolver - Failure in @ExceptionHandler com.imooc.exception.GraceExceptionHandler#returnException(MyException)
java.lang.NullPointerException: null