使用parseObject 时报default constructor not found

[GuChuan]

有一个类嵌套了其他的内部类

@Data
    public class SwitchContext {
    private String zoneName;
    private String clusterName;
    private ArrayList<TableTarget> tableTargets = new ArrayList<TableTarget>();
    private ZoneInfo zoneInfo;
    private ArrayList<TableTarget> runningQueue = new ArrayList<TableTarget>();
    private ArrayList<TableTarget> waittingQueue = new ArrayList<TableTarget>();
    private HashMap<TableTarget,String> invalidQueue = new HashMap<TableTarget, String>();
    private SwitchTask switchTask;
    private DecisionInfoMaintainer decisonInfoMaintainer = DecisionInfoMaintainer.getInstance();
    private HashMap<String,TableOnlineConfig> tableOnlineConfigHashMap;
    private HashMap<String,TableOfflineInfo> tableOfflineInfoHashMap;
    private HashMap<String,TableOnlineInfo> tableOnlineInfoHashMap;
    private HashMap<Long, TableDeployment> tableDeploymentHashMap;

使用 SwitchContext switchContext = parseObject(String s,SwitchContext.class ) 报异常：

com.alibaba.fastjson.JSONException: default constructor not found. class com.alibaba.search.autoumars.dataswitchcenter.model.TableOfflineInfo

我看网上有一种解法：http://blog.csdn.net/pengpenggxp/article/details/39181859

这种是需要从顶层类一直加到底层类吗？我有不少类都用了注解

[wenshao]

非静态内嵌类，建议添加static修饰符

[GuChuan]

@wenshao 是否只有这一种解法？

[GuChuan]

我发现一个问题，凡是用了@Data注解的类，parseObject的时候都会报default constructor not found，这个注解的运行机制应该和fastjson 解析的逻辑冲突了

[wenshao]

非静态内嵌类的缺省构造需要parent.this

[halfhq]

@wenshao 加入static也是无效的

    /**
     * {"state":1,"data":{"msg":"123"}}
     */
    void testInternalClass() {
        String json = "{\"state\":1,\"data\":{\"msg\":\"123\"}}";
        try {
            InternalClassTest c = JSON.parseObject(json, InternalClassTest.class);
            Log.d("JSON", "c.state=" + c.state + ", c.data.msg=" + (c.data == null ? "null" : c.data.msg));
        } catch (Exception e) {
            e.printStackTrace();    //com.alibaba.fastjson.JSONException: default constructor not found
        }
    }

    public static class InternalClassTest {
        public InternalClassTest() {
            super();
        }
        @JSONField(name = "state")
        public boolean state;
        @JSONField(name = "data")
        public Data data;

        public static class Data {
            public Data() {
                super();
            }
            @JSONField(name = "msg")
            public String msg;
        }
    }

依旧出现错误

om.alibaba.fastjson.JSONException: default constructor not found. class com.yyw.fastjson_example.MainActivit
   at com.alibaba.fastjson.util.JavaBeanInfo.build(Unknown Source)
   at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.<init>(Unknown Source)
   at com.alibaba.fastjson.parser.ParserConfig.createJavaBeanDeserializer(Unknown Source)
   at com.alibaba.fastjson.parser.ParserConfig.getDeserializer(Unknown Source)
   at com.alibaba.fastjson.parser.deserializer.DefaultFieldDeserializer.getFieldValueDeserilizer(Unknown Sou
   at com.alibaba.fastjson.parser.deserializer.DefaultFieldDeserializer.parseField(Unknown Source)
   at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.parseField(Unknown Source)
   at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(Unknown Source)
   at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(Unknown Source)
   at com.alibaba.fastjson.parser.deserializer.JavaBeanDeserializer.deserialze(Unknown Source)
   at com.alibaba.fastjson.parser.DefaultJSONParser.parseObject(Unknown Source)
   at com.alibaba.fastjson.JSON.parseObject(Unknown Source)
   at com.alibaba.fastjson.JSON.parseObject(Unknown Source)
   at com.alibaba.fastjson.JSON.parseObject(Unknown Source)

compile 'com.alibaba:fastjson:1.2.33'
compile 'com.alibaba:fastjson:1.1.58.android'

混淆：

fastjson

-dontwarn com.alibaba.fastjson. -keepattributes Signature -keepattributes Annotation -keep class com.alibaba.fastjson. { *; }

[halfhq]

1.使用static类 2.创建一个interface IFastJson，将此类的全部implements IFastJson 3.在proguard.txt中配置

-keep class * implements com.xxxx.IFastJson { public (***); }

[faryang-sh]

缺少了一个无参构造器，在需要序列化的类中加入一个无参构造器，如果用了liquibase，在序列化类中加入@NoArgsConstructor 注解

[Nevall]

解决办法： 1.使用static类 2.创建一个interface IFastJson，将此类的内部类实现implements IFastJson 3.在proguard.txt中配置 -keep class * implements com.xxxx.IFastJson

[seefutureLee]

是这样 如果我的bean有了带参数带构造方法 那必须再写一个无参数带构造方法 这样就不会报错了

[Lyeluo]

如果是没有源码，引用的第三方包呢？怎么办，不能提供无参构造呀