```java
public class User implements java.io.Serializable {
private Map<Long, Long> map;
public Map<Long, Long> getMap() {
return map;
}
public void setMap(Map<Long, Long> map) {
this.map = map;
}
}
```
序列化之前：
```java
User user = new User();
Map<Long, Long> map = new HashMap<>();
map.put(null, 1L);
user.setMap(map);
String hello = demoService.sayHello(user);
```
序列化之后，map里面的key变成0
[ Full content available at:
https://github.com/apache/dubbo-hessian-lite/issues/30 ]
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