upangka opened a new issue, #80:
URL: https://github.com/apache/dubbo-hessian-lite/issues/80
## Environment
1. Hessian Version: com.alibaba.com.caucho.hessian (latest)4.0.3
2. Java Version: JDK 17+ (Record feature required)
3. OS: Any
`pom.xml`
```xml
<dependencies>
<dependency>
<groupId>org.apache.dubbo</groupId>
<artifactId>hessian-lite</artifactId>
<version>4.0.3</version>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<version>1.18.36</version>
</dependency>
</dependencies>
```
## Problem Description
When serializing and deserializing a record object graph containing shared
references (e.g., two Student records sharing the same Address), Hessian2
throws an IndexOutOfBoundsException. The same scenario works correctly with
Lombok @Data classes.
## Steps to Reproduce
```java
record Address(String city) implements Serializable {}
record Student(String id,String name,Address address) implements
Serializable{}
record StuRep(List<Student> students) implements Serializable{}
public static void main(String[] args) throws Exception {
Address address1 = new Address("BeiJing");
Address address2 = new Address("ShangHai");
Student student1 = new Student("1001", "ZhangSan", address1);
// issue here Shared address1
Student student2 = new Student("1002", "Lisi", address1);
StuRep stuRep = new StuRep(List.of(student1, student2));
// serialize
byte[] serializedData = serialize(stuRep);
// deserialize
StuRep deserializedStuRep = deserialize(serializedData);
}
public static byte[] serialize(StuRep obj) throws Exception {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
Hessian2Output out = new Hessian2Output(bos);
out.writeObject(obj);
out.close();
return bos.toByteArray();
}
public static StuRep deserialize(byte[] data) throws Exception {
ByteArrayInputStream bis = new ByteArrayInputStream(data);
Hessian2Input in = new Hessian2Input(bis);
StuRep obj = (StuRep) in.readObject();
in.close();
return obj;
}
```
**Error**
```sh
Caused by: java.lang.IndexOutOfBoundsException: Index 3 out of bounds for
length 3
at com.alibaba.com.caucho.hessian.io.RecordDeserializer.readObject
```
## Expected Behavior
Deserialization should succeed, preserving object reference sharing (same
behavior as Lombok @Data classes).
```java
@Data
@AllArgsConstructor
@NoArgsConstructor
static class Address implements Serializable {
private String city;
}
@Data
@AllArgsConstructor
@NoArgsConstructor
static class Student implements Serializable{
private String id;
private String name;
private Address address;
}
@Data
@AllArgsConstructor
@NoArgsConstructor
static class StuRep implements Serializable{
List<Student> students;
}
public static void main(String[] args) throws Exception {
Address address1 = new Address("BeiJing");
Address address2 = new Address("ShangHai");
Student student1 = new Student("1001", "zhangSan", address1);
Student student2 = new Student("1002", "LiSi", address1);
StuRep stuRep = new StuRep(List.of(student1, student2));
// serialize
byte[] serializedData = serialize(stuRep);
// deserialize
StuRep deserializedStuRep = deserialize(serializedData);
}
public static byte[] serialize(StuRep obj) throws Exception {
ByteArrayOutputStream bos = new ByteArrayOutputStream();
Hessian2Output out = new Hessian2Output(bos);
out.writeObject(obj);
out.close();
return bos.toByteArray();
}
public static StuRep deserialize(byte[] data) throws Exception {
ByteArrayInputStream bis = new ByteArrayInputStream(data);
Hessian2Input in = new Hessian2Input(bis);
StuRep obj = (StuRep) in.readObject();
in.close();
return obj;
}
```
# Actual Behavior
✅ Works: Lombok classes with @Data (shared references handled correctly).
❌ Fails: Java Records with shared references (throws
IndexOutOfBoundsException).
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