MarshallingException：无法取消编组结果参考

我正在使用play 2.4，并且想要在模型“user”中设置参考对象“文档”。如果我遍历迭代器，我得到以下错误：因此，如果我调用路由/用户，通常我应该得到一个与所有用户对象和嵌入式文档的Json列表。内容{“_id”：{“$ oid”：“560969b4d4c6209ff2a1a973”}，“name”：“Alexander Buder”，“documents”：[{“命名”： “Sample.pdf”}，{ “名称”： “检验.pdf”}]}]MarshallingException：无法取消编组结果参考

模型用户

package models; 


import com.fasterxml.jackson.annotation.JsonProperty; 
import org.jongo.MongoCollection; 
import org.bson.types.ObjectId; 
import uk.co.panaxiom.playjongo.PlayJongo; 

import java.util.ArrayList; 
import java.util.Iterator; 
import java.util.List; 

/** 
* Created by abuder on 28.09.15. 
*/ 
public class User { 

    public static MongoCollection users() { 
     return PlayJongo.getCollection("users"); 
    } 

    @JsonProperty("_id") 
    private ObjectId id; 
    private String name; 
    private List<Document> documents = new ArrayList<Document>(); 

    public User save() { 
     users().save(this); 
     return this; 
    } 

    public ObjectId getId() { 
     return id; 
    } 

    public void setId(ObjectId id) { 
     this.id = id; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

    public List<Document> getDocuments() { 
     return documents; 
    } 

    public void setDocuments(List<Document> documents) { 
     this.documents = documents; 
    } 

    public void remove() { 
     users().remove(this.id); 
    } 

    public static User findByName(String name) { 
     return users().findOne("{name: #}", name).as(User.class); 
    } 

    public static List<User> findAll(){ 
     List<User> userList = new ArrayList<User>(); 
     Iterator<User> iterator = users().find().as(User.class).iterator(); 
     while (iterator.hasNext()){ 
      userList.add(iterator.next()); 
     } 
     return userList; 
    } 

}

模型文献

package models; 

/** 
* Created by abuder on 28.09.15. 
*/ 
public class Document { 


    private String name; 
    public Document(String name){ 
     this.name = name; 
    } 

    public String getName() { 
     return name; 
    } 

    public void setName(String name) { 
     this.name = name; 
    } 

}

控制器

条

package controllers; 

import models.Document; 
import models.User; 
import play.*; 
import play.libs.Json; 
import play.mvc.*; 

import views.html.*; 

import java.util.List; 

public class Application extends Controller { 

    public Result index() { 

     Document doc1 = new Document("Sample.pdf"); 
     Document doc2 = new Document("Test.pdf"); 

     User user = new User(); 
     user.setName("Alexander Buder"); 
     user.getDocuments().add(doc1); 
     user.getDocuments().add(doc2); 
     user.save(); 

     return ok(Json.toJson(user)); 
    } 


    public Result usersJson(){ 
     List<User> userList = User.findAll(); 
     return ok(Json.toJson(userList)); 
    } 

}

路线

GET  /     controllers.Application.index() 

GET  /users    controllers.Application.usersJson()

来源

2015-09-28 abuder

我发现这个问题。我忘了在展台模型中实现默认的构造函数，实现后，程序运行良好。

来源

2015-09-29 07:22:52 abuder

MarshallingException：无法取消编组结果参考

回答

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