alibaba / alibaba/fastjson2

[BUG]toJavaObject的结果于parseObject结果不一致

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bug
Dominant language
Java
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Description

### 问题描述
*简要描述您碰到的问题。*
toJavaObject的结果于parseObject结果不一致。

### 环境信息
*请填写以下信息:*

- OS信息: []
- JDK信息: [JDK17]
- 版本信息:[2.0.34]

### 重现步骤
*如何操作可以重现该问题:*
```java
try {
// 报错: java.lang.ClassCastException: class cn.toint.tool.pojo.DTO.JdyApiDataFieldTypeDTO$SubformDTO cannot be cast to class cn.toint.xinri.pojo.mapper.XrSendMarketSmsByLoktongJdyMapper$UserMapper (cn.toint.tool.pojo.DTO.JdyApiDataFieldTypeDTO$SubformDTO and cn.toint.xinri.pojo.mapper.XrSendMarketSmsByLoktongJdyMapper$UserMapper are in unnamed module of loader org.springframework.boot.devtools.restart.classloader.RestartClassLoader @20ee4442)
System.out.println(
// jdyApiDataWebhookDTO.getData() 是一个JSONObject对象,@RequestBody自动转换的对象.
jdyApiDataWebhookDTO.getData().toJavaObject(XrSendMarketSmsByLoktongJdyMapper.class).getUserList().get(0).getClass());
} catch (Exception e) {
log.error("toJavaObject err", e);
}

try {
// 正常
System.out.println(
JSON.parseObject(JSON.toJSONString(jdyApiDataWebhookDTO.getData()),
XrSendMarketSmsByLoktongJdyMapper.class).getUserList().get(0).getClass());
} catch (Exception e) {
log.error("parseObject err", e);
}
```

SubformDTO是UserMapper的父类。

### 期待的正确结果
*对您期望发生的结果进行清晰简洁的描述。*

### 相关日志输出
*请复制并粘贴任何相关的日志输出。*

#### 附加信息
*如果你还有其他需要提供的信息,可以在这里填写(可以提供截图、视频等)。*

Contributor guide

Open the contributing guide

Research direction

Start with the provided reproducer and compare JSONObject.toJavaObject with JSON.parseObject(JSON.toJSONString(...)) for XrSendMarketSmsByLoktongJdyMapper. Inspect how the nested UserMapper and its SubformDTO parent are converted; done means both paths produce the same nested Java type without ClassCastException.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
backend
Issue type
Bug
Difficulty
4/5
Estimated time
3-5 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
30/100

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