ObjectReaderImplMap.of方法生成ReadObject时，希望mapType可以支持非public修饰的类

[FanJiaRui]

请描述您的需求或者改进建议

ObjectReaderImplMap.of方法生成ReadObject时，希望mapType可以支持非public修饰的类
例如：

private static class MyMap implements Map{ //..... }

ObjectReaderImplMap.of(new TypeReference<Map<String, Object>>() {}.getType(), MyMap.class, 0);
现在这么用会在运行到实例化Map时报错，问题出在ObjectReaderImplMapTyped.createInstance方法中

请描述你建议的实现方案

建议将ObjectReaderImplMapTyped.createInstance方法中instanceType.newInstance();实现修改为
try { Constructor<?> constructor = instanceType.getConstructor(); constructor.setAccessible(true); constructor.newInstance(); } catch (InstantiationException | IllegalAccessException | NoSuchMethodException | InvocationTargetException e) { throw new JSONException("create map error"); }

[wenshao]

能够提供重现问题的TestCase么？

[FanJiaRui]

能够提供重现问题的TestCase么？
你好,代码如下

package unit.test1;

import com.alibaba.fastjson2.JSONFactory;
import com.alibaba.fastjson2.JSONObject;
import com.alibaba.fastjson2.TypeReference;
import com.alibaba.fastjson2.reader.ObjectReader;
import com.alibaba.fastjson2.reader.ObjectReaderImplMap;

import java.util.HashMap;
import java.util.Map;

public class TestUtils {

    static {
        ObjectReader objectReader1 = ObjectReaderImplMap.of(new TypeReference<Map<String, Object>>() {
        }.getType(), TestPublicMap.class, 0);
        JSONFactory.getDefaultObjectReaderProvider().register(TestPublicMap.class, objectReader1);

        ObjectReader objectReader2 = ObjectReaderImplMap.of(new TypeReference<Map<String, Object>>() {
        }.getType(), TestPrivateMap.class, 0);
        JSONFactory.getDefaultObjectReaderProvider().register(TestPrivateMap.class, objectReader2);
    }

    public static void main(String[] args) {
        Map<String, Object> a = JSONObject.parseObject("{'a':'b'}").to(TestPublicMap.class);
        System.out.println(a);

        Map<String, Object> b = JSONObject.parseObject("{'a':'b'}").to(TestPrivateMap.class);
        System.out.println(a);
    }

    public static class TestPublicMap extends HashMap<String, Object>  {

    }

    private static class TestPrivateMap extends HashMap<String, Object>  {

    }

}

[FanJiaRui]

我用的是Oracel JDK 1.8.0_201 和fastjson 2.0.9,补充一下运行结果相关截图

[wenshao]

https://oss.sonatype.org/content/repositories/snapshots/com/alibaba/fastjson2/fastjson2/2.0.10-SNAPSHOT/
问题已经修复，请用2.0.10-SNAPSHOT版本验证，2.0.10正式版预计在7月24日前发布

[FanJiaRui]

感谢支持,已经验证无问题,期待新版本的发布

[wenshao]

https://github.com/alibaba/fastjson2/releases/tag/2.0.10
问题已修复，请用新版本