zrlw commented on issue #9237:
URL: https://github.com/apache/dubbo/issues/9237#issuecomment-977785446
@stone-98
是不是在dubbo-hessian-lite的pom文件加入bson依赖：
```
<dependency>
<groupId>org.mongodb</groupId>
<artifactId>bson</artifactId>
<version>4.4.0</version>
</dependency>
```
然后实现
1. ObjectIdHandler
构造方法入参为ObjectId对象，调用ObjectId.toByteArray()方法获取byte数组并保存；
2. ObjectIdSerializer：
new ObjectId(ObjectIdHandler的byte数组变量）创建ObjectId对象；
3. SerializerFactory#getSerializer增加ObjectId分支，配置ObjectIdHandler
4. 增加用于验证的单元测试
如果上述理解没有问题，我可以代你加个PR。
我有个疑问，有没有更加通用一点的办法么？每个默认序列化方法搞不定的数据类型难道都要在pom里面去加一个依赖才可以么？
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