[BUG]升级到fastjson2后，反序列化丢失信息

[MengSucess]

问题描述

不同的注解方法结果不同。

环境信息

• OS信息： Windows 11
• JDK信息：Oracle JDK 1.8
• 版本信息：fastjson2 2.0.6

重现步骤

如何操作可以重现该问题：

1. 在不同的fastjson.jar 下运行下面的代码重现

import com.alibaba.fastjson2.JSON;
import com.alibaba.fastjson2.annotation.JSONField;

import java.io.Serializable;
import java.util.List;

/**
 * fastjson2 新版本测试
 */
public class JsonTest {

    /**
     * fastjson2 这种注解方式可以正常工作
     */
    public class User implements Serializable {

        @JSONField(name = "id")
        private int id;
        @JSONField(name = "title")
        private String title;
        @JSONField(name = "parent_id")
        private Integer parentId;
        @JSONField(name = "display_level")
        private Integer displayLevel;
        @JSONField(name = "item_index")
        private Integer itemIndex;
        @JSONField(name = "child_count")
        private Integer childCount;
        @JSONField(name = "phase_id")
        private Integer phaseId;
        @JSONField(name = "del_state")
        private int delState;
        @JSONField(name = "path")
        private String path;
        @JSONField(name = "update_time")
        private Long updateTime;


        public int getId() {
            return id;
        }

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


        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }


        public Integer getParentId() {
            return parentId;
        }

        public void setParentId(Integer parentId) {
            this.parentId = parentId;
        }


        public Integer getDisplayLevel() {
            return displayLevel;
        }

        public void setDisplayLevel(Integer displayLevel) {
            this.displayLevel = displayLevel;
        }


        public Integer getItemIndex() {
            return itemIndex;
        }

        public void setItemIndex(Integer itemIndex) {
            this.itemIndex = itemIndex;
        }


        public Integer getChildCount() {
            return childCount;
        }

        public void setChildCount(Integer childCount) {
            this.childCount = childCount;
        }


        public Integer getPhaseId() {
            return phaseId;
        }

        public void setPhaseId(Integer phaseId) {
            this.phaseId = phaseId;
        }


        public int getDelState() {
            return delState;
        }

        public void setDelState(int delState) {
            this.delState = delState;
        }


        public String getPath() {
            return path;
        }

        public void setPath(String path) {
            this.path = path;
        }


        public Long getUpdateTime() {
            return updateTime;
        }

        public void setUpdateTime(Long updateTime) {
            this.updateTime = updateTime;
        }
    }

    /**
     * fastjson2 这种方式会丢失字段信息。
     * fastjson1 不会丢失信息
     */
    public class User2 implements Serializable {
        private int id;
        private String title;
        private Integer parentId;
        private Integer displayLevel;
        private Integer itemIndex;
        private Integer childCount;
        private Integer phaseId;
        private int delState;
        private String path;
        private Long updateTime;

        @JSONField(name = "id")
        public int getId() {
            return id;
        }

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

        @JSONField(name = "title")
        public String getTitle() {
            return title;
        }

        public void setTitle(String title) {
            this.title = title;
        }

        @JSONField(name = "parent_id")
        public Integer getParentId() {
            return parentId;
        }

        public void setParentId(Integer parentId) {
            this.parentId = parentId;
        }

        @JSONField(name = "display_level")
        public Integer getDisplayLevel() {
            return displayLevel;
        }

        public void setDisplayLevel(Integer displayLevel) {
            this.displayLevel = displayLevel;
        }

        @JSONField(name = "item_index")
        public Integer getItemIndex() {
            return itemIndex;
        }

        public void setItemIndex(Integer itemIndex) {
            this.itemIndex = itemIndex;
        }

        @JSONField(name = "child_count")
        public Integer getChildCount() {
            return childCount;
        }

        public void setChildCount(Integer childCount) {
            this.childCount = childCount;
        }

        @JSONField(name = "phase_id")
        public Integer getPhaseId() {
            return phaseId;
        }

        public void setPhaseId(Integer phaseId) {
            this.phaseId = phaseId;
        }

        @JSONField(name = "del_state")
        public int getDelState() {
            return delState;
        }

        public void setDelState(int delState) {
            this.delState = delState;
        }

        @JSONField(name = "path")
        public String getPath() {
            return path;
        }

        public void setPath(String path) {
            this.path = path;
        }

        @JSONField(name = "update_time")
        public Long getUpdateTime() {
            return updateTime;
        }

        public void setUpdateTime(Long updateTime) {
            this.updateTime = updateTime;
        }
    }

    public static void main(String[] args) {
        String text = "[{\"child_count\":8,\"del_state\":0,\"display_level\":2,\"id\":54,\"item_index\":46,\"parent_id\":1,\"path\":\"/1/54/\",\"phase_id\":1,\"title\":\"八年级上\",\"update_time\":1596423978669}]";
        List<User> list1 = JSON.parseArray(text, User.class);
        if (list1 != null && list1.size() > 0) {
            User user = list1.get(0);
            System.out.println(JSON.toJSONString(user));
            //这里的输出结果如下
            // {"child_count":8,"del_state":0,"display_level":2,"id":54,"item_index":46,"parent_id":1,"path":"/1/54/","phase_id":1,"title":"八年级上","update_time":1596423978669}
        }


        text = "[{\"child_count\":8,\"del_state\":0,\"display_level\":2,\"id\":54,\"item_index\":46,\"parent_id\":1,\"path\":\"/1/54/\",\"phase_id\":1,\"title\":\"八年级上\",\"update_time\":1596423978669}]";
        List<User2> list2 = JSON.parseArray(text, User2.class);
        if (list2 != null && list2.size() > 0) {
            User2 user2 = list2.get(0);
            System.out.println(JSON.toJSONString(user2));
            //fastjson2 这里的输出结果如下，
            //{"del_state":0,"id":54,"path":"/1/54/","title":"八年级上"}
            //而fastjson1输出的结果是完整的，
            // {"child_count":8,"del_state":0,"display_level":2,"id":54,"item_index":46,"parent_id":1,"path":"/1/54/","phase_id":1,"title":"八年级上","update_time":1596423978669}
        }

    }
}

运行环境：
idea maven 项目，使用了spring framework，struts2

[wenshao]

https://oss.sonatype.org/content/repositories/snapshots/com/alibaba/fastjson/2.0.7-SNAPSHOT/
问题已经修复，请帮忙用2.0.7-SNAPSHOT版本验证

[MengSucess]

好的，我先测试下，原来测试的使用兼容1的fastjson2和独立的fastjson2都存在此问题。下面2个地址的pom引用之后都出同样的问题
https://mvnrepository.com/artifact/com.alibaba.fastjson2/fastjson2/2.0.6
https://mvnrepository.com/artifact/com.alibaba/fastjson/2.0.6

是不是应该推荐使用独立的 fastjson2，兼容1的fastjson2只是过渡期间的版本吧，以后不会一直维护下去吧？

[wenshao]

兼容的会一直维护下去

[wenshao]

https://github.com/alibaba/fastjson2/releases/tag/2.0.7
问题已经修复，请用新版本