alibaba / alibaba/fastjson2

[BUG]fastjson2-2.0.51 版本 com.alibaba.fastjson2.writer.ObjectWriterAdapter#toJSONObject(T, long) 方法Date类型字段format=millis时传入空报空指针,不兼容。

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Description

### 问题描述
*简要描述您碰到的问题。*
fastjson2-2.0.51 版本 com.alibaba.fastjson2.writer.ObjectWriterAdapter#toJSONObject(T, long) 方法Date类型字段format=millis时传入空报空指针,不兼容。

### 环境信息
*请填写以下信息:*
fastjson2-2.0.51
- OS信息: [e.g.:CentOS 8.4.2105 4Core 3.10GHz 16 GB]
- JDK信息: [e.g.:Openjdk 1.8.0_312]
- 版本信息:[e.g.:Fastjson2 2.x.x]

### 重现步骤
*如何操作可以重现该问题:*
com.alibaba.fastjson2.writer.ObjectWriterAdapter#toJSONObject(T, long) 方法Date类型字段format=millis时传入空报空指针,不兼容。
1. 使用 `xxx.xxx` 方法
2. 输入 `...` 数据
3. 出现 `...` 错误
```java
//可在此输入示例代码
```

### 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 at com.alibaba.fastjson2.writer.ObjectWriterAdapter#toJSONObject(T, long) and reproduce the reported case with a Date field using format=millis and a null value. Inspect the resulting null-pointer failure; done requires resolving the reported incompatibility without the exception, with the expected result confirmed before adding or updating coverage.

Written by the indexing model from the issue text.

Assessment

Tech stack
java
Domain
backend
Issue type
Bug
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Needs clarification
Newbie friendliness
25/100

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