net.sf.json.JSONObject强转后序列化报错java.io.NotSerializableException: net.sf.ezmorph.primitive.CharMorpher

╰+哭是因爲堅強的太久メ 2023-10-10 00:52 15阅读 0赞

#### 目录 ####

*   *  一、场景
     *  二、报错信息
     *  三、代码
     *   *  1、实体
         *  2、测试
     *  四、原因
     *   *  为什么？
     *  五、解决

--------------------

### 一、场景 ###

1、将net.sf.json.JSONObject转为实体对象

2、将实体对象的List属性序列化（List属性的实体类以实现`Serializable`接口）

3、序列化报错-`java.io.NotSerializableException: net.sf.ezmorph.primitive.CharMorpher`

--------------------

### 二、报错信息 ###

java.io.NotSerializableException: net.sf.ezmorph.primitive.CharMorpher
    	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1184)
    	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
    	at java.util.ArrayList.writeObject(ArrayList.java:766)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.lang.reflect.Method.invoke(Method.java:498)
    	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1140)
    	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
    	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
    	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
    	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)
    	at java.util.HashMap.internalWriteEntries(HashMap.java:1793)
    	at java.util.HashMap.writeObject(HashMap.java:1363)
    	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    	at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    	at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    	at java.lang.reflect.Method.invoke(Method.java:498)
    	at java.io.ObjectStreamClass.invokeWriteObject(ObjectStreamClass.java:1140)
    	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1496)
    	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
    	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
    	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
    	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
    	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
    	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
    	at java.io.ObjectOutputStream.defaultWriteFields(ObjectOutputStream.java:1548)
    	at java.io.ObjectOutputStream.writeSerialData(ObjectOutputStream.java:1509)
    	at java.io.ObjectOutputStream.writeOrdinaryObject(ObjectOutputStream.java:1432)
    	at java.io.ObjectOutputStream.writeObject0(ObjectOutputStream.java:1178)
    	at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:348)

--------------------

### 三、代码 ###

#### 1、实体 ####

package com.xxx.entity.serviceflow;
    
    import lombok.Data;
    
    import java.io.Serializable;
    
    
    @Data
    //注意：实体以实现Serializable接口
    public class BranchNodeCondition implements Serializable {
        
    
        private static final long serialVersionUID = 1L;
    
        private Long id;
    
        private String paramName;
    
        private String judgeType;
    	
        private String paramValue;
    
        private Integer paramGroup;
    
        private String pgJudgeType;
    }

#### 2、测试 ####

package com.xxx;
    
    import com.xxx.entity.serviceflow.BranchNodeCondition;
    import com.xxx.entity.serviceflow.BranchNodeData;
    import net.sf.json.JSONObject;
    
    import java.util.ArrayList;
    import java.util.List;
    
    
    public class Test {
        
        public static void main(String[] args) {
        
            //构建对象
            BranchNodeData data = new BranchNodeData();
            data.setBranchId(1L);
            data.setBranchJumpId(10L);
            data.setBranchMemo("默认");
            data.setBranchType("1");
            data.setSeq(0);
            //设置conditionList属性
            List<BranchNodeCondition> conditionList = new ArrayList<>();
            BranchNodeCondition condition = new BranchNodeCondition();
            condition.setId(1L);
            condition.setJudgeType("0");
            condition.setParamGroup(1);
            condition.setParamName("name");
            condition.setParamValue("盖伦 与 卡特琳娜");
            condition.setPgJudgeType("0");
            conditionList.add(condition);
            data.setConditionList(conditionList);
    
            JSONObject json = JSONObject.fromObject(data);
            System.out.println("BranchNodeData转为json字符串：\n" + json);
    
    
            System.out.println("\n-------------华丽的分割线-------------\n");
    
    
    		//------以下代码为重点，前面的代码只是铺垫------
            BranchNodeData o = (BranchNodeData) JSONObject.toBean(json, BranchNodeData.class);
            System.out.println("json字符串转为BranchNodeData：\n" + o.toString() + "\n");
            
            //将conditionList序列化（执行到这里报错）
            ListUtil.deepCopy(o.getConditionList());
        }
    }

--------------------

### 四、原因 ###

1、从表面上看List集合存储的是`BranchNodeCondition`类型的对象，该类确实已经实现`Serializable`接口，正常应该是可以序列化的

2、但实际上List集合存储的是`net.sf.ezmorph.bean.MorphDynaBean`类型的对象，该类可没有实现`Serializable`接口

#### 为什么？ ####

3、JsonObject 对象强转 Java对象，且JsonObject对象中含有数组类型（ArrayList）的属性时会出现这种情况

4、在转换时不会报错，  
但是想要拿到转换后的数组进行操作（例如for循环）时会报错`java.lang.ClassCastException: net.sf.ezmorph.bean.MorphDynaBean cannot be cast to com.xxx.entity.xxx`，  
序列化也会报错`java.io.NotSerializableException: net.sf.ezmorph.primitive.CharMorpher`

5、以本篇代码为例，可以看到强转后的`conditionList`属性类型与原先的属性类型是不一致的（原先类型为：`BranchNodeCondition`，转换后却是：`net.sf.ezmorph.bean.MorphDynaBean`）

BranchNodeData转为json字符串：
    {
        "branchId":1,"branchJumpId":10,"branchMemo":"默认","branchType":"1","conditionList":[{
        "id":1,"judgeType":"0","paramGroup":1,"paramName":"name","paramValue":"盖伦 与 卡特琳娜","pgJudgeType":"0"}],"seq":0}
    
    -------------华丽的分割线-------------
    
    json字符串转为BranchNodeData：
    BranchNodeData(branchId=1, seq=0, branchType=1, branchMemo=默认, branchJumpId=10, conditionList=[net.sf.ezmorph.bean.MorphDynaBean@396e2f39[
      {
        paramGroup=1, judgeType=0, id=1, paramName=name, paramValue=盖伦 与 卡特琳娜, pgJudgeType=0}
    ]])

--------------------

### 五、解决 ###

JsonObject中含有List属性，所以需要用map映射一下

以本篇为例

//注释掉原先转换的代码
    		//BranchNodeData o = (BranchNodeData) JSONObject.toBean(json, BranchNodeData.class);
    		
    		//定义Map映射
            Map<String,Class<?>> classMap = new HashMap<>();
            //Map-Key为实体对象List属性的属性名称
            //Map-Value为实体对象List属性的属性类型
            classMap.put("conditionList", BranchNodeCondition.class);
            //指定Map映射
            BranchNodeData o = (BranchNodeData) JSONObject.toBean(json, BranchNodeData.class, classMap);

使用Map映射之后的List集合就可以序列化了