spring控制器List<User>参数?报错

实体类User:Name,Id两个属性的set/get

实体类UserListWrapper:ArrayList<User>的set/get

ajax post json数据：

ajax json:
{  name:"xx",
   users:[
              {id:1},
              {id:2}
            ]
}

法1,@RequestParam(value="content") String content,@ModelAttribute("users[]") UserListWrapper users 

org.springframework.beans.InvalidPropertyException: Invalid property 'users[0][Id]' of bean class 
   [me.***.TagListWrapper]: Property referenced in indexed property path 'users[0][Id]' is neither an array nor a List nor a Map; returned value was [me.**.domain.User@4706e34d]

法2,@RequestParam(value="content") String content,@ModelAttribute("users") UserListWrapper users

  报错如 法1
法3,@RequestParam(value="content") String content,@ModelAttribute("users") ArrayList<User> users
  users.size等于0
法4,@RequestParam(value="content") String content,@ModelAttribute("users[]") ArrayList<User> users
   users.size等于0