lucky-xin edited a comment on issue #54:
URL:
https://github.com/apache/dubbo-hessian-lite/issues/54#issuecomment-986413418
如果类定义了writeReplace方法，那么在创建JavaSerializer时会遍历类获取writeReplace方法
```java
private Method _writeReplace;
public JavaSerializer(Class cl, ClassLoader loader) {
introspectWriteReplace(cl, loader);// 这里初始化_writeReplace
if (_writeReplace != null)
_writeReplace.setAccessible(true);
}
```
然后在序列化时就执行com.alibaba.com.caucho.hessian.io.JavaSerializer#writeObject方法，代码如下
```java
@Override
public void writeObject(Object obj, AbstractHessianOutput out)
throws IOException {
if (out.addRef(obj)) {
return;
}
Class cl = obj.getClass();
try {
if (_writeReplace != null) {
Object repl;
if (_writeReplaceFactory != null)
repl = _writeReplace.invoke(_writeReplaceFactory, obj);
else
repl = _writeReplace.invoke(obj);
//Some class would return itself for wrapReplace, which
would cause infinite recursion
//In this case, we could write the object just like normal
cases
if (repl != obj) {
out.removeRef(obj);
out.writeObject(repl);
out.replaceRef(repl, obj);
return;
}
}
} catch (RuntimeException e) {
throw e;
} catch (Exception e) {
// log.log(Level.FINE, e.toString(), e);
throw new RuntimeException(e);
}
int ref = out.writeObjectBegin(cl.getName());
if (ref < -1) {
writeObject10(obj, out);
} else {
if (ref == -1) {
writeDefinition20(out);
out.writeObjectBegin(cl.getName());
}
writeInstance(obj, out);
}
}
```
因为_writeReplace不为null，就执行writeReplace方法，然后替换对象
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