Spring HashSet Rest 模型问题

Question

我有一个用户模型。它在我的 Spring Security 中使用，我有一些 HashSet 字段，其中包含我的用户的角色。但现在我尝试设置休息。当我获得 json 格式的 User 对象时，由于这个 HashSet，我还得到了一些无限循环。

我的控制器：

@RequestMapping(value="/rest/{login}", method = RequestMethod.GET)
    public String getRest(@PathVariable String login, Model model){
        model.addAttribute("user",dao.findByLogin(login));
        return "rest";
    }

小片段：

{
  "user" : {
    "login" : "roman",
    "password" : "$2a$10$04TVADrR6/SPLBjsK0N30.Jf5fNjBugSACeGv1S69dZALR7lSov0y",
    "email" : "email",
    "enabled" : true,
    "userRole" : [ {
      "roleId" : 1,
      "user" : {
        "login" : "roman",
        "password" : "$2a$10$04TVADrR6/SPLBjsK0N30.Jf5fNjBugSACeGv1S69dZALR7lSov0y",
        "email" : "email",
        "enabled" : true,
        "userRole" : [ {
          "roleId" : 1,
          "user" : {
            "login" : "roman",
            "password" : "$2a$10$04TVADrR6/SPLBjsK0N30.Jf5fNjBugSACeGv1S69dZALR7lSov0y",
            "email" : "email",
            "enabled" : true,
            "userRole" : [ {
              "roleId" : 1,
              "user" : {
                "login" : "roman",
                "password" : "$2a$10$04TVADrR6/SPLBjsK0N30.Jf5fNjBugSACeGv1S69dZALR7lSov0y",
                "email" : "email",
                "enabled" : true,
                "userRole" : [ {
                  "roleId" : 1,
                  "user" : {
                    "login" : "roman",
                    "password" : "$2a$10$04TVADrR6/SPLBjsK0N30.Jf5fNjBugSACeGv1S69dZALR7lSov0y",
                    "email" : "email",
                    "enabled" : true,
                    "userRole" : [ {
                      "roleId" : 1,
                      "user" : {
                        "login" : "roman",
                        "password" : "$2a$10$04TVADrR6/SPLBjsK0N30.Jf5fNjBugSACeGv1S69dZALR7lSov0y",
                        "email" : "email",
                        "enabled" : true,
                        "userRole" : [ {
                          "roleId" : 1,
                          "user" : {
                            "login" : "roman",
                            "password" : "$2a$10$04TVADrR6/SPLBjsK0N30.Jf5fNjBugSACeGv1S69dZALR7lSov0y",
                            "email" : "email",
                            "enabled" : true,
                            "userRole" : [ {
                              "roleId" : 1,
                              "user" : {
                                "login" : "roman",
                                "password" : "$2a$10$04TVADrR6/SPLBjsK0N30.Jf5fNjBugSACeGv1S69dZALR7lSov0y",
                                "email" : "email",
                                "enabled" : true,
                                "userRole" : [ {
                                  "roleI ....

在这种情况下我能做什么？

Answer 1

用以下方式注释user的属性UserRole：

@JsonBackReference

这告诉杰克逊这是一个循环引用，不应该被遵循。