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无法读取文件：N / A com.fasterxml.jackson.databind.JsonMappingException

[英]Could not read document: N/A com.fasterxml.jackson.databind.JsonMappingException

 原文  2016-06-25 14:09:59  3   1    java/ json/ rest/ jackson/ gson

问题描述

我正在构建一个通过REST和HTTP进行通信的服务器-客户端应用程序。 我的问题是，我尝试创建一个任务。 我从客户端发送的JSON如下所示： 

{
"taskType": "USER_STORY",
"headLine": "ew",
"taskText": "wewe",
"author": {
"id": 1,
"confirmed": false,
"email": "testlogin@test.de",
"userName": "Daniel",
"password": "test",
"creationTime": 1466843454239,
"assignedTasks": [
  {
    "id": 1,
    "possibleTaskTypes": [
      "USER_STORY",
      "TECHNICAL_STORY",
      "BUG"
    ],
    "possibleTaskContainer": [
      "PRODUCT_BACKLOG",
      "SELECTED_BACKLOG",
      "SPRINT"
    ],
    "taskType": "USER_STORY",
    "headLine": "123",
    "taskText": "fsfd",
    "possibleworkFlowStati": [
      "START",
      "READY_FOR_ESTIMATION",
      "READY_FOR_SPRINT",
      "OPEN",
      "IN_PROGRESS",
      "DONE"
    ],
    "author": {
      "id": 1,
      "confirmed": false
    },
    "assignee": {
      "id": 1,
      "confirmed": false
    },
    "comments": [],
    "creationTime": 1466843507898
  }
],
"createdTasks": [
  {
    "id": 1,
    "possibleTaskTypes": [
      "USER_STORY",
      "TECHNICAL_STORY",
      "BUG"
    ],
    "possibleTaskContainer": [
      "PRODUCT_BACKLOG",
      "SELECTED_BACKLOG",
      "SPRINT"
    ],
    "taskType": "USER_STORY",
    "headLine": "123",
    "taskText": "fsfd",
    "possibleworkFlowStati": [
      "START",
      "READY_FOR_ESTIMATION",
      "READY_FOR_SPRINT",
      "OPEN",
      "IN_PROGRESS",
      "DONE"
    ],
    "author": {
      "id": 1,
      "confirmed": false
    },
    "assignee": {
      "id": 1,
      "confirmed": false
    },
    "comments": [],
    "creationTime": 1466843507898
  }
]
},
 "assignee": {
 "id": 1,
 "confirmed": false,
 "email": "testlogin@test.de",
  "userName": "Daniel",
 "password": "test",
"creationTime": 1466843454239,
"assignedTasks": [
  {
    "id": 1,
    "possibleTaskTypes": [
      "USER_STORY",
      "TECHNICAL_STORY",
      "BUG"
    ],
    "possibleTaskContainer": [
      "PRODUCT_BACKLOG",
      "SELECTED_BACKLOG",
      "SPRINT"
    ],
    "taskType": "USER_STORY",
    "headLine": "123",
    "taskText": "fsfd",
    "possibleworkFlowStati": [
      "START",
      "READY_FOR_ESTIMATION",
      "READY_FOR_SPRINT",
      "OPEN",
      "IN_PROGRESS",
      "DONE"
    ],
    "author": {
      "id": 1,
      "confirmed": false
    },
    "assignee": {
      "id": 1,
      "confirmed": false
    },
    "comments": [],
    "creationTime": 1466843507898
  }
],
"createdTasks": [
  {
    "id": 1
  }
]
 }
}

我从服务器收到的错误消息是这样的： 

 {
  "title": "Message Not Readable",
  "status": 400,
  "detail": "Could not read document: N/A (through reference chain:     de.name.supervisor.rest.domain.Task[\"author\"]->de.name.supervisor.rest.domain.User[\"assignedTasks\"]->java.util.HashSet[0]->de.name.supervisor.rest.domain.Task[\"author\"]); nested exception is com.fasterxml.jackson.databind.JsonMappingException: N/A (through reference chain: de.name.supervisor.rest.domain.Task[\"author\"]->de.name.supervisor.rest.domain.User[\"assignedTasks\"]->java.util.HashSet[0]->de.name.supervisor.rest.domain.Task[\"author\"])","timeStamp": 1466859943472,
  "developerMessage":   "org.springframework.http.converter.HttpMessageNotReadableException",
  "errors": {}
}

我不知道，什么是行不通的。 当我发布一个用户时，我没有任何问题。

Swagger-UI生成的示例JSON是： 

    {
  "comments": [
    "string"
  ],
  "creationTime": 0,
  "possibleTaskContainer": [
    "string"
  ],
  "author": {
    "password": "string",
    "creationTime": 0,
    "createdTasks": [
      {}
    ],
    "id": 0,
    "userName": "string",
    "confirmed": true,
    "email": "string",
    "assignedTasks": [
      {}
    ]
  },
  "sprint": {
    "inProgress": [
      {}
    ],
    "creationTime": 0,
    "endDate": {
      "dayOfWeek": "MONDAY",
      "month": "JANUARY",
      "year": 0,
      "dayOfMonth": 0,
      "era": {
        "value": 0
      },
      "dayOfYear": 0,
      "monthValue": 0,
      "chronology": {
        "id": "string",
        "calendarType": "string"
      },
      "leapYear": true
    },
    "allTasks": [
      {}
    ],
    "sprintName": "string",
    "id": 0,
    "toDos": [
      {}
    ],
    "done": [
      {}
    ],
    "startDate": {
      "dayOfWeek": "MONDAY",
      "month": "JANUARY",
      "year": 0,
      "dayOfMonth": 0,
      "era": {
        "value": 0
      },
      "dayOfYear": 0,
      "monthValue": 0,
      "chronology": {
        "id": "string",
        "calendarType": "string"
      },
      "leapYear": true
    }
  },
  "taskContainer": "string",
  "headLine": "string",
  "taskType": "string",
  "id": 0,
  "possibleTaskTypes": [
    "string"
  ],
  "assignee": {
    "password": "string",
    "creationTime": 0,
    "createdTasks": [
      {}
    ],
    "id": 0,
    "userName": "string",
    "confirmed": true,
    "email": "string",
    "assignedTasks": [
      {}
    ]
  },
  "possibleworkFlowStati": [
    "string"
  ],
  "taskText": "string",
  "status": "string"
}

可能是客户端发送的JSON中的assingee和user对象只有id和Confirmed字段的问题？ 如果这是原因，那么这将意味着我的控制器无法正常工作。 因此，此处为发布请求的控制器方法： 

public HttpResponse postTask(Task task)throws ClientProtocolException, IOException{
        HttpClient client = HttpClients.createDefault();
        HttpPost post = new HttpPost(TASK_URI_V1);
        Gson gson = new Gson();
        String json = gson.toJson(task);
        logger.info("Request-Body created: "+json);
        post.setEntity(new StringEntity(json));
        post.setHeader("Content-type", "application/json");
        HttpResponse  response = client.execute(post);
        logger.info("Response from Web-Service after executing postTask request: "+response.getStatusLine().toString());
        logger.info("Response Head from Web-Service after executing postTask request: "+response.toString());
        logger.info("Response Body from Web-Service after executing postTask request: "+RestControllerUtils.getResponseBodyAsString(response));

        return response;
    }

这是客户端的用户模型： 

@JsonIgnoreProperties(ignoreUnknown = true)
public class User {

    public User(){};

    public User(int id){
        setId(new Long(id));
    }

    private Long id;

    private boolean confirmed;

    private String email;

    private String userName;

    private String password;

    private Long creationTime;

    private Set<Task> assignedTasks;

    private Set<Task> createdTasks;

    public Long getId() {
        return id;
    }

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

    public boolean isConfirmed() {
        return confirmed;
    }

    public void setConfirmed(boolean confirmed) {
        this.confirmed = confirmed;
    }

    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Long getCreationTime() {
        return creationTime;
    }

    public void setCreationTime(Long creationTime) {
        this.creationTime = creationTime;
    }

    public Set<Task> getAssignedTasks() {
        return assignedTasks;
    }

    public void setAssignedTasks(Set<Task> assignedTasks) {
        this.assignedTasks = assignedTasks;
    }

    public void addAssignedTasks(Task task){
        addAssignedTasks(task,true);
    }

    void addAssignedTasks(Task task, boolean set){
        if(task != null){
            getAssignedTasks().add(task);
            if(set){
                task.setAssignee(this);
            }
        }
    }
    public void removeAssidnedTask(Task task) {
        getAssignedTasks().remove(task);
        task.setAssignee(null);;
    }

    public Set<Task> getCreatedTasks() {
        return createdTasks;
    }

    public void setCreatedTasks(Set<Task> createdTasks) {
        this.createdTasks = createdTasks;
    }

    public void addCreatedTask(Task task){
        addCreatedTask(task,true);
    }

    void addCreatedTask(Task task, boolean set){
        if(task != null){
            getCreatedTasks().add(task);
            if(set){
                task.setAuthor(this);
            }
        }
    }

    public void removeCreatedTask(Task task) {
        getCreatedTasks().remove(task);
        task.setAuthor(null);
    }

}

以及服务器的用户模型： 

@Entity
@Table(name="User")

@JsonIdentityInfo(generator=ObjectIdGenerators.IntSequenceGenerator.class,property="@id", scope = User.class)
public class User {
    @Id
    @GeneratedValue
    @Column(name="USER_ID")
    private Long id;

    @Column(name="CONFIRMATION")
    private boolean confirmed;

    @Column(name = "EMAIL",nullable = false)
    private String email;

    @Column(name = "USERNAME",nullable = false)
    @NotNull
    private String userName;

    @Column(name="PASSWORD",nullable = false)
    @NotNull
    private String password;

    @Column(name="TIMESTAMP")
    private Long creationTime;

    @OneToMany(cascade={CascadeType.DETACH,CascadeType.MERGE,CascadeType.REFRESH }, mappedBy="author",fetch=FetchType.EAGER)
    private Set<Task>assignedTasks;

    @OneToMany(cascade={CascadeType.DETACH,CascadeType.MERGE,CascadeType.REFRESH }, mappedBy="assignee",fetch=FetchType.EAGER) 
    private Set<Task>createdTasks;


    public User() {
    }

    public Long getId() {
        return id;
    }

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



    public String getEmail() {
        return email;
    }

    public void setEmail(String email) {
        this.email = email;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }

    public Long getCreationTime() {
        return creationTime;
    }

    public void setCreationTime(Long creationTime) {
        this.creationTime = creationTime;
    }

    public boolean isConfirmed() {
        return confirmed;
    }

    public void setConfirmed(boolean confirmed) {
        this.confirmed = confirmed;
    }

    public Set<Task> getAssignedTasks() {
        return assignedTasks;
    }

    public void setAssignedTasks(Set<Task> assignedTasks) {
        this.assignedTasks = assignedTasks;
    }

    public void addAssignedTasks(Task task){
        addAssignedTasks(task,true);
    }

    void addAssignedTasks(Task task, boolean set){
        if(task != null){
            getAssignedTasks().add(task);
            if(set){
                task.setAssignee(this);
            }
        }
    }
    public void removeAssidnedTask(Task task) {
        getAssignedTasks().remove(task);
        task.setAssignee(null);;
    }

    public Set<Task> getCreatedTasks() {
        return createdTasks;
    }

    public void setCreatedTasks(Set<Task> createdTasks) {
        this.createdTasks = createdTasks;
    }

    public void addCreatedTask(Task task){
        addCreatedTask(task,true);
    }

    void addCreatedTask(Task task, boolean set){
        if(task != null){
            getCreatedTasks().add(task);
            if(set){
                task.setAuthor(this);
            }
        }
    }

    public void removeCreatedTask(Task task) {
        getCreatedTasks().remove(task);
        task.setAuthor(null);
    }

    @Override
    public String toString() {
        return "User [id=" + id + ", confirmed=" + confirmed + ", email=" + email + ", userName=" + userName
                + ", password=" + password + "]";
    }  


}

服务器的任务类： 

@Entity
@Table(name="Task")
//@JsonIdentityInfo(generator = ObjectIdGenerators.PropertyGenerator.class, property = "id")
@JsonIdentityInfo(generator=ObjectIdGenerators.IntSequenceGenerator.class,property="@id", scope = Task.class)
public class Task {


    @Id
    @GeneratedValue
    @Column(name="TASK_ID")
    private Long id;

    @Transient
    private List<String> possibleTaskTypes = TaskType.getTaskTypesAsString();

    @Transient 
    private List<String>possibleTaskContainer = TaskContainer.getTaskContainerAsString();

    @Column(name="TASK_Container")
    private String taskContainer;

    @Column(name="TASK_TYPE")
    private String taskType;

    @Column(name="HEAD_LINE")
    private String headLine;

    @Column(name="TASK_TEXT")
    private String taskText;

    @Transient
    private List<String> possibleworkFlowStati = WorkFlowStatus.getWorkFlowsStatiAsString();

    @Column(name="WORKFLOW_STATUS")
    private String status;

    @ManyToOne(cascade = {CascadeType.DETACH,CascadeType.MERGE,CascadeType.REFRESH })
    private User author;

    @ManyToOne(cascade = {CascadeType.DETACH,CascadeType.MERGE,CascadeType.REFRESH }) //TODO Check wether remove too.
    private User assignee;

    @Column(name="COMMENTS")
    @ElementCollection(targetClass=String.class)
    private List<String>comments;

    @ManyToOne(cascade=CascadeType.ALL)
    private Sprint sprint;

    @Column(name="TIMESTAMP")
    private Long creationTime;

    public Long getId() {
        return id;
    }

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

    public String getHeadLine() {
        return headLine;
    }

    public void setHeadLine(String headLine) {
        this.headLine = headLine;
    }

    public String getTaskText() {
        return taskText;
    }

    public void setTaskText(String taskText) {
        this.taskText = taskText;
    }

    public User getAuthor() {
        return author;
    }

    public void setAuthor(User author) {
        setAuthor(author, true);
    }

    void setAuthor(User author, boolean add){
        this.author = author;
        if(author !=null&&add){
            author.addCreatedTask(this, false);
        }
    }

    public User getAssignee() {
        return assignee;
    }

    public void setAssignee(User assignee) {
        setAssignee(assignee,true);
    }

    void setAssignee(User assignee, boolean add){
        this.assignee = assignee;
        if(assignee != null && add){
            assignee.addAssignedTasks(this,false);
        }
    }

    public List<String> getComments() {
        return comments;
    }

    public void setComments(List<String> comments) {
        this.comments = comments;
    }

    public Sprint getSprint() {
        return sprint;
    }

    public void setSprint(Sprint sprint) {
        this.sprint = sprint;
    }

    public Long getCreationTime() {
        return creationTime;
    }

    public void setCreationTime(Long creationTime) {
        this.creationTime = creationTime;
    }

    public String getTaskType() {
        return taskType;
    }

    public void setTaskType(String taskType) {
        this.taskType = taskType;
    }

    public List<String> getPossibleTaskTypes() {
        return possibleTaskTypes;
    }

    public void setPossibleTaskTypes(List<String> possibleTaskTypes) {
        this.possibleTaskTypes = possibleTaskTypes;
    }

    public List<String> getPossibleworkFlowStati() {
        return possibleworkFlowStati;
    }

    public void setPossibleworkFlowStati(List<String> possibleworkFlowStati) {
        this.possibleworkFlowStati = possibleworkFlowStati;
    }

    public String getStatus() {
        return status;
    }

    public void setStatus(String status) {
        this.status = status;
    }

    public List<String> getPossibleTaskContainer() {
        return possibleTaskContainer;
    }

    public void setPossibleTaskContainer(List<String> possibleTaskContainer) {
        this.possibleTaskContainer = possibleTaskContainer;
    }

    public String getTaskContainer() {
        return taskContainer;
    }

    public void setTaskContainer(String taskContainer) {
        this.taskContainer = taskContainer;
    }

    @Override
    public String toString() {
        return "Task [id=" + id + ", possibleTaskTypes=" + possibleTaskTypes + ", possibleTaskContainer="
                + possibleTaskContainer + ", taskContainer=" + taskContainer + ", taskType=" + taskType + ", headLine="
                + headLine + ", taskText=" + taskText + ", possibleworkFlowStati=" + possibleworkFlowStati + ", status="
                + status + ", author=" + author + ", assignee=" + assignee + ", comments=" + comments + ", sprint="
                + sprint + ", creationTime=" + creationTime + "]";
    }




}

1 个解决方案

解决方案1
 0 已采纳  2016-06-25 14:22:31

看起来您的JSON包含某种递归。

你有author包含createTasks和assignedTasks ，以及这些对象包括author 。

您可以使用Java Pojos提供服务器代码吗？

更新

我看到了Pojos，所以我认为您可以在这篇文章中找到一些线索。

你应该告诉杰克逊如何处理createTasks和assignedTask 。

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