杰克逊JsonMappingException

杰克逊JsonMappingException

本文介绍了杰克逊JsonMappingException:无法反序列化实例的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!

问题描述

我想我的JSON数据转换为杰克逊使用一个POJO对象。这里是在MainActivity和我的POJO类code。我基本上得到一个JsonMappingException错误。我还附上了整个日志。

MainActivity.java:

  ObjectMapper映射器=新ObjectMapper();
    mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
    尝试{
        清单<&条目GT;结果= mapper.readValue(新URL(http://collegewires.com/android/jacksoncw.json),新TypeReference<名单,LT;条目>>(){});
        的for(int i = 0; I< results.size(); ++ I){
            的System.out.println(results.get(ⅰ).getName());
            OUT = OUT +##+ results.get(I).getName();
            txt.setText(1111);
        }
    }赶上(JsonParseException E){
        // TODO自动生成catch块
        e.printStackTrace();    }赶上(JsonMappingException E){
        // TODO自动生成catch块
        e.printStackTrace();    }赶上(MalformedURLException的E){
        // TODO自动生成catch块
        e.printStackTrace();    }赶上(IOException异常五){
        // TODO自动生成catch块
        e.printStackTrace();
    }

Entries.java(这是POJO)

 包com.collegewires.jackson;公共类条目{
公共条目(){
}私人字符串ID,姓名,电子邮件地址,性别;
私人手机电话;公用电话getPhone(){
    回电话;
}公共无效setPhone(电话电话){
    this.phone =电话;
}公共字符串的getId(){
    返回ID;
}公共无效SETID(字符串ID){
    this.id = ID;
}公共字符串的getName(){
    返回名称;
}公共无效setname可以(字符串名称){
    this.name =名称;
}公共字符串getEmail(){
    返回的电子邮件;
}公共无效setEmail(字符串email){
    this.email =电子邮件;
}公共字符串的getAddress(){
    退货地址;
}公共无效setAddress(字符串地址){
    this.address =地址;
}公共字符串getGender(){
    返回性别;
}公共无效setGender(字符串性别){
    this.gender =性别;
}@覆盖
公共字符串的toString(){
    返回条目:{ID:+身份证+,名称:+姓名+
                电子邮件:+电子邮件+,地址:+地址+,性别:+性别+,电话:+手机+};
}公共类电话{
    公用电话(){
    }
    公共字符串手机,家庭,办公;
    公共字符串getMobile(){
        返回移动;
    }    公共无效setMobile(字符串移动){
        this.mobile =移动;
    }    公共字符串getHome(){
        回家;
    }    公共无效设为首页(字符串家){
        this.home =回家;
    }    公共字符串getOffice(){
        返回办公室;
    }    公共无效setOffice(字符串办){
        this.office =办事处;
    }    @覆盖
    公共字符串的toString(){
        返回电话:{移动+移动+,回家+家居+
                    办公室:+办公+};
    }
}
}

现在,我得到我的日志中出现以下错误。正因为如此,我无法继续我的工作继续进行。这里是日志:

  12月7日至12日:06:13.206:W / System.err的(30593):com.fasterxml.jackson.databind.JsonMappingException:无法反序列化的java.util.ArrayList实例出来START_OBJECT令牌
12月7日至12日:06:13.206:W / System.err的(30593):在[来源:http://collegewires.com/android/jacksoncw.json;行:1,柱:1]
12月7日至12日:06:13.211:W / System.err的(30593):在com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:575)
12月7日至12日:06:13.211:W / System.err的(30593):在com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:569)
12月7日至12日:06:13.211:W / System.err的(30593):在com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.handleNonArray(CollectionDeserializer.java:259)
12月7日至12日:06:13.211:W / System.err的(30593):在com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:217)
12月7日至12日:06:13.211:W / System.err的(30593):在com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:207)
12月7日至12日:06:13.211:W / System.err的(30593):在com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:23)
12月7日至12日:06:13.211:W / System.err的(30593):在com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)
12月7日至12日:06:13.211:W / System.err的(30593):在com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2018)
12月7日至12日:06:13.211:W / System.err的(30593):在com.collegewires.jackson.MainActivity.onCreate(MainActivity.java:81)
12月7日至12日:06:13.211:W / System.err的(30593):在android.app.Activity.performCreate(Activity.java:5250)
12月7日至12日:06:13.211:W / System.err的(30593):在android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
12月7日至12日:06:13.211:W / System.err的(30593):在android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
12月7日至12日:06:13.211:W / System.err的(30593):在android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
12月7日至12日:06:13.211:W / System.err的(30593):在android.app.ActivityThread.access $ 700(ActivityThread.java:152)
12月7日至12日:06:13.211:W / System.err的(30593):在android.app.ActivityThread $ H.handleMessage(ActivityThread.java:1282)
12月7日至12日:06:13.211:W / System.err的(30593):在android.os.Handler.dispatchMessage(Handler.java:99)
12月7日至12日:06:13.211:W / System.err的(30593):在android.os.Looper.loop(Looper.java:137)
12月7日至12日:06:13.211:W / System.err的(30593):在android.app.ActivityThread.main(ActivityThread.java:5328)
12月7日至12日:06:13.211:W / System.err的(30593):在java.lang.reflect.Method.invokeNative(本机方法)
12月7日至12日:06:13.211:W / System.err的(30593):在java.lang.reflect.Method.invoke(Method.java:511)
12月7日至12日:06:13.211:W / System.err的(30593):在com.android.internal.os.ZygoteInit $ MethodAndArgsCaller.run(ZygoteInit.java:1102)
12月7日至12日:06:13.211:W / System.err的(30593):在com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
12月7日至12日:06:13.211:W / System.err的(30593):在dalvik.system.NativeStart.main(本机方法)
12月7日至12日:06:13.251:D / libEGL(30593):加载/vendor/lib/egl/libEGL_POWERVR_SGX544_115.so
12月7日至12日:06:13.261:D / libEGL(30593):加载/vendor/lib/egl/libGLESv1_CM_POWERVR_SGX544_115.so
12月7日至12日:06:13.266:D / libEGL(30593):加载/vendor/lib/egl/libGLESv2_POWERVR_SGX544_115.so
12月7日至12日:06:132.71:I /(30593):@IMGSRV:日期:2013年4月23日(11时19分33秒)|! BUILDER:LSI3D |修订:e9cd1377d8225457ae40
12月7日至12日:06:13.346:D / OpenGLRenderer(30593):启用调试模式0
12月7日至12日:06:31.521:W / IInputConnectionWrapper(30593)上的非活动InputConnection setComposingText


解决方案

  1. &放取出构造函数; 电话


  2. GetEntries结果= mapper.readValue(新URL(http://collegewires.com/android/jacksoncw.json),GetEntries.class);


  3. 条目似乎是在你的JSON的参数。


GetEntries.java

 包com.collegewires.jackson;进口的java.util.List;公共类GetEntries {
    私人列表<&条目GT;条目;    公开名单<&条目GT; getEntries(){
        返回this.entries;
    }
    公共无效setEntries(列表<&条目GT;项){
        this.entries =条目;
    }
}

Entries.java

 包com.collegewires.jackson;进口的java.util.List;公共类条目{
    私人字符串的地址;
    私人字符串电子邮件;
    私人字符串性别;
    私人字符串ID;
    私人字符串名称;
    私人手机电话;    公共字符串的getAddress(){
        返回this.address;
    }
    公共无效setAddress(字符串地址){
        this.address =地址;
    }
    公共字符串getEmail(){
        返回this.email;
    }
    公共无效setEmail(字符串email){
        this.email =电子邮件;
    }
    公共字符串getGender(){
        返回this.gender;
    }
    公共无效setGender(字符串性别){
        this.gender =性别;
    }
    公共字符串的getId(){
        返回this.id;
    }
    公共无效SETID(字符串ID){
        this.id = ID;
    }
    公共字符串的getName(){
        返回this.name;
    }
    公共无效setname可以(字符串名称){
        this.name =名称;
    }
    公用电话getPhone(){
        返回this.phone;
    }
    公共无效setPhone(电话电话){
        this.phone =电话;
    }
}

Phone.java

 包com.collegewires.jackson;进口的java.util.List;公共类电话{
    私人字符串回家;
    私人字符串移动;
    私人字符串办事处;    公共字符串getHome(){
        返回this.home;
    }
    公共无效设为首页(字符串家){
        this.home =回家;
    }
    公共字符串getMobile(){
        返回this.mobile;
    }
    公共无效setMobile(字符串移动){
        this.mobile =移动;
    }
    公共字符串getOffice(){
        返回this.office;
    }
    公共无效setOffice(字符串办){
        this.office =办事处;
    }
}

I'm trying to convert my json data to a POJO object using Jackson. Here is the MainActivity and my POJO class code. I'm basically getting a JsonMappingException error. I have also attached the whole log.

MainActivity.java :

ObjectMapper mapper = new ObjectMapper();
    mapper.disable(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES);
    try {
        List<Entries> results = mapper.readValue(new URL("http://collegewires.com/android/jacksoncw.json"), new TypeReference<List<Entries>>(){});
        for(int i=0;i<results.size();++i){
            System.out.println(results.get(i).getName());
            out = out + " ## " + results.get(i).getName();
            txt.setText("1111");
        }
    } catch (JsonParseException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();

    } catch (JsonMappingException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();

    } catch (MalformedURLException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();

    } catch (IOException e) {
        // TODO Auto-generated catch block
        e.printStackTrace();
    }

Entries.java (this is the POJO)

package com.collegewires.jackson;

public class Entries {
public Entries(){
}

private String id, name, email, address, gender;
private Phone phone;

public Phone getPhone() {
    return phone;
}

public void setPhone(Phone phone) {
    this.phone = phone;
}

public String getId() {
    return id;
}

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

public String getName() {
    return name;
}

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

public String getEmail() {
    return email;
}

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

public String getAddress() {
    return address;
}

public void setAddress(String address) {
    this.address = address;
}

public String getGender() {
    return gender;
}

public void setGender(String gender) {
    this.gender = gender;
}

@Override
public String toString() {
    return "Entries:{id: " + id + ", name: " + name +
                ", email: " + email + ", address: " + address + ", gender: " + gender + ", phone: " + phone + "}";
}

public class Phone {
    public Phone(){
    }
    public String  mobile, home, office;
    public String getMobile() {
        return mobile;
    }

    public void setMobile(String mobile) {
        this.mobile = mobile;
    }

    public String getHome() {
        return home;
    }

    public void setHome(String home) {
        this.home = home;
    }

    public String getOffice() {
        return office;
    }

    public void setOffice(String office) {
        this.office = office;
    }

    @Override
    public String toString() {
        return "Phone:{mobile: " + mobile + ", home: " + home +
                    ", office: " + office + "}";
    }
}


}

Now, I'm getting the following error in my log. Because of this, I'm unable to proceed with my work. Here is the log :

07-12 12:06:13.206: W/System.err(30593):

com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token
07-12 12:06:13.206: W/System.err(30593):  at [Source: http://collegewires.com/android/jacksoncw.json; line: 1, column: 1]
07-12 12:06:13.211: W/System.err(30593):    at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:575)
07-12 12:06:13.211: W/System.err(30593):    at com.fasterxml.jackson.databind.DeserializationContext.mappingException(DeserializationContext.java:569)
07-12 12:06:13.211: W/System.err(30593):    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.handleNonArray(CollectionDeserializer.java:259)
07-12 12:06:13.211: W/System.err(30593):    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:217)
07-12 12:06:13.211: W/System.err(30593):    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:207)
07-12 12:06:13.211: W/System.err(30593):    at com.fasterxml.jackson.databind.deser.std.CollectionDeserializer.deserialize(CollectionDeserializer.java:23)
07-12 12:06:13.211: W/System.err(30593):    at com.fasterxml.jackson.databind.ObjectMapper._readMapAndClose(ObjectMapper.java:2888)
07-12 12:06:13.211: W/System.err(30593):    at com.fasterxml.jackson.databind.ObjectMapper.readValue(ObjectMapper.java:2018)
07-12 12:06:13.211: W/System.err(30593):    at com.collegewires.jackson.MainActivity.onCreate(MainActivity.java:81)
07-12 12:06:13.211: W/System.err(30593):    at android.app.Activity.performCreate(Activity.java:5250)
07-12 12:06:13.211: W/System.err(30593):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1097)
07-12 12:06:13.211: W/System.err(30593):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2211)
07-12 12:06:13.211: W/System.err(30593):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2297)
07-12 12:06:13.211: W/System.err(30593):    at android.app.ActivityThread.access$700(ActivityThread.java:152)
07-12 12:06:13.211: W/System.err(30593):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1282)
07-12 12:06:13.211: W/System.err(30593):    at android.os.Handler.dispatchMessage(Handler.java:99)
07-12 12:06:13.211: W/System.err(30593):    at android.os.Looper.loop(Looper.java:137)
07-12 12:06:13.211: W/System.err(30593):    at android.app.ActivityThread.main(ActivityThread.java:5328)
07-12 12:06:13.211: W/System.err(30593):    at java.lang.reflect.Method.invokeNative(Native Method)
07-12 12:06:13.211: W/System.err(30593):    at java.lang.reflect.Method.invoke(Method.java:511)
07-12 12:06:13.211: W/System.err(30593):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1102)
07-12 12:06:13.211: W/System.err(30593):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:869)
07-12 12:06:13.211: W/System.err(30593):    at dalvik.system.NativeStart.main(Native Method)
07-12 12:06:13.251: D/libEGL(30593): loaded /vendor/lib/egl/libEGL_POWERVR_SGX544_115.so
07-12 12:06:13.261: D/libEGL(30593): loaded /vendor/lib/egl/libGLESv1_CM_POWERVR_SGX544_115.so
07-12 12:06:13.266: D/libEGL(30593): loaded /vendor/lib/egl/libGLESv2_POWERVR_SGX544_115.so
07-12 12:06:13.271: I/(30593): !@IMGSRV: DATE: 2013.04.23(11:19:33) | BUILDER: LSI3D | REVISION: e9cd1377d8225457ae40
07-12 12:06:13.346: D/OpenGLRenderer(30593): Enabling debug mode 0
07-12 12:06:31.521: W/IInputConnectionWrapper(30593): setComposingText on inactive InputConnection
解决方案
  1. Remove the Constructor in Entries & Phone

  2. GetEntries results = mapper.readValue(new URL("http://collegewires.com/android/jacksoncw.json"), GetEntries.class);

  3. Entries seems to be a parameter in your JSON.

GetEntries.java

package com.collegewires.jackson;

import java.util.List;

public class GetEntries{
    private List<Entries> entries;

    public List<Entries> getEntries(){
        return this.entries;
    }
    public void setEntries(List<Entries> entries){
        this.entries = entries;
    }
}

Entries.java

package com.collegewires.jackson;

import java.util.List;

public class Entries{
    private String address;
    private String email;
    private String gender;
    private String id;
    private String name;
    private Phone phone;

    public String getAddress(){
        return this.address;
    }
    public void setAddress(String address){
        this.address = address;
    }
    public String getEmail(){
        return this.email;
    }
    public void setEmail(String email){
        this.email = email;
    }
    public String getGender(){
        return this.gender;
    }
    public void setGender(String gender){
        this.gender = gender;
    }
    public String getId(){
        return this.id;
    }
    public void setId(String id){
        this.id = id;
    }
    public String getName(){
        return this.name;
    }
    public void setName(String name){
        this.name = name;
    }
    public Phone getPhone(){
        return this.phone;
    }
    public void setPhone(Phone phone){
        this.phone = phone;
    }
}

Phone.java

package com.collegewires.jackson;

import java.util.List;

public class Phone{
    private String home;
    private String mobile;
    private String office;

    public String getHome(){
        return this.home;
    }
    public void setHome(String home){
        this.home = home;
    }
    public String getMobile(){
        return this.mobile;
    }
    public void setMobile(String mobile){
        this.mobile = mobile;
    }
    public String getOffice(){
        return this.office;
    }
    public void setOffice(String office){
        this.office = office;
    }
}

这篇关于杰克逊JsonMappingException:无法反序列化实例的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持!

08-20 15:44