一、异常描述

通过flexjson进行字符串转换Map时报“Exception in thread "main" flexjson.JSONException: [  ]: Could not find a no-arg constructor for java.util.Map..Caused by: java.lang.NoSuchMethodException: java.util.Map.<init>()..”异常,具体日志如下

Exception in thread "main" flexjson.JSONException: [  ]: Could not find a no-arg constructor for java.util.Map@b@	at flexjson.factories.ClassLocatorObjectFactory.instantiate(ClassLocatorObjectFactory.java:53)@b@	at flexjson.ObjectBinder.bind(ObjectBinder.java:68)@b@	at flexjson.ObjectBinder.bind(ObjectBinder.java:60)@b@	at flexjson.JSONDeserializer.deserialize(JSONDeserializer.java:156)@b@	at com.xwood.publisher.util.JsonUtil.fromJson(JsonUtil.java:50)@b@	at com.xwood.publisher.util.JsonUtil.main(JsonUtil.java:108)@b@Caused by: java.lang.NoSuchMethodException: java.util.Map.<init>()@b@	at java.lang.Class.getConstructor0(Class.java:2715)@b@	at java.lang.Class.getDeclaredConstructor(Class.java:1987)@b@	at flexjson.factories.ClassLocatorObjectFactory.instantiate(ClassLocatorObjectFactory.java:28)

二、解决方法

通过flexjson工具类实现字符串及对象互转(工具类转换示例),之前转换示例

String  ssss="{\"CONTENT_TYPE\":\"0\",\"CHANNLE_ID\":\"9386\",\"CONTENT_ID\":\"157756\",\"OBJECT_ID\":\"157756\",\"TITLE\":\"test8\"}";@b@Map<String,String> ps=JsonUtil.fromJson(ssss, Map.class);

改为如下问题解决了

String  ssss="{\"CONTENT_TYPE\":\"0\",\"CHANNLE_ID\":\"9386\",\"CONTENT_ID\":\"157756\",\"OBJECT_ID\":\"157756\",\"TITLE\":\"test8\"}";@b@Map<String,String> ps=JsonUtil.fromJson(ssss);