[BUG]JSONObject.getObject获取List时出现java.lang.UnsupportedOperationException

[LoftyKumo]

问题描述

由fastjson1升级至fastjson2的过程中
fastjson2版本2.0.7
使用JSONObject.getObject(key, List.class)时, 会抛出java.lang.UnsupportedOperationException

fastjson2版本2.0.8 2.0.9-SNAPSHOT
使用JSONObject.getObject(key, List.class)时,会抛出com.alibaba.fastjson2.JSONException: UnsupportedOperation

环境信息

• OS信息： macOS 10.13.6
• JDK信息： JDK 11.0.2
• 版本信息：2.0.7 2.0.8 2.0.9-SNAPSHOT

重现步骤

使用测试代码如下
Map<String, Object> map = null;
List objects = Lists.newArrayList();
for (int i = 0; i < 1; i++) {
map = Maps.newHashMap();
map.put("cursor", i);
objects.add(map);
}
JSONObject jsonObject = new JSONObject();
jsonObject.put("data", objects);
jsonObject.getObject("data", List.class);

期待的正确结果

运行通过, 可正常获取data字段数据

相关日志输出

fastjson版本2.0.7
java.lang.UnsupportedOperationException
at com.alibaba.fastjson2.reader.ObjectReaderBaseModule$PrimitiveImpl.createInstance(ObjectReaderBaseModule.java:1809)
at com.alibaba.fastjson2.reader.ObjectReaderImplObject.createInstance(ObjectReaderImplObject.java:15)
at com.alibaba.fastjson2.reader.ObjectReader.createInstance(ObjectReader.java:78)
at com.alibaba.fastjson2.reader.ObjectReaderImplList.createInstance(ObjectReaderImplList.java:186)
at com.alibaba.fastjson2.JSONObject.getObject(JSONObject.java:1273)

fastjson2.0.8 fastjson2.0.9-SNAPSHOT
com.alibaba.fastjson2.JSONException: UnsupportedOperation
at com.alibaba.fastjson2.reader.ObjectReaderBaseModule$PrimitiveImpl.createInstance(ObjectReaderBaseModule.java:1810)
at com.alibaba.fastjson2.reader.ObjectReaderImplObject.createInstance(ObjectReaderImplObject.java:15)
at com.alibaba.fastjson2.reader.ObjectReader.createInstance(ObjectReader.java:78)
at com.alibaba.fastjson2.reader.ObjectReaderImplList.createInstance(ObjectReaderImplList.java:186)
at com.alibaba.fastjson2.JSONObject.getObject(JSONObject.java:1273)

[wenshao]

https://oss.sonatype.org/content/repositories/snapshots/com/alibaba/fastjson2/fastjson2/2.0.9-SNAPSHOT/
问题已经修复，请用2.0.9-SNAPSHOT版本验证

[wenshao]

https://github.com/alibaba/fastjson2/releases/tag/2.0.9
问题已修复，请用新版本

[howie206]

@LoftyKumo 使用2.0.9之后 这个bug问题还存在吗？

[LoftyKumo]

@LoftyKumo 使用2.0.9之后 这个bug问题还存在吗？

2.0.9修复了这个问题, 出现了#541 目前改为了使用JSONArray

[532780857]

        <artifactId>fastjson2-parent</artifactId>
        <version>2.0.12</version>
`

```log
java.lang.UnsupportedOperationException: com.alibaba.fastjson2.reader.ObjectReaderImplObject
	at com.alibaba.fastjson2.reader.ObjectReader.createInstance(ObjectReader.java:37)
	at com.alibaba.fastjson2.reader.ObjectReaderImplMapTyped.createInstance(ObjectReaderImplMapTyped.java:91)
	at com.alibaba.fastjson2.JSONObject.to(JSONObject.java:1141)
	at com.alibaba.fastjson2.reader.ObjectReader.createInstance(ObjectReader.java:107)
	at com.alibaba.fastjson2.JSONObject.to(JSONObject.java:1189)
	at com.solvay.bzj.entity.codeFlow.importFlow.entity.IntelligentMasterSlaveEntity.getEntity(IntelligentMasterSlaveEntity.java:38)
`

我这个也是同样的问题吗？