[hibernate-issues] [Hibernate-JIRA] Created: (HHH-3463) Make proxies truly Serializable

[Daniel Fernández (JIRA)]

Make proxies truly Serializable
-------------------------------

                 Key: HHH-3463
                 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3463
             Project: Hibernate3
          Issue Type: Improvement
          Components: core
    Affects Versions: 3.2.6
         Environment: Hibernate 3.2.6, database-independent
            Reporter: Daniel Fernández


When I get a CGLIB entity proxy from hibernate, it is in an un-initialized state, but I can serialize it anyway... if I do, and then de-serialize it, by the moment I call any of its "getX()" methods, it tries to get initialized and... it fails with:

LazyInitializationException: could not initialize proxy - no Session

This is normal for me, but a little frustrating. Having a look at Hibernate's code, I found that org.hibernate.proxy.pojo.cglib.SerializableProxy had the following "readResolve" method:
  
private Object readResolve() {
   try {
      return CGLIBLazyInitializer.getProxy(
         entityName,
         persistentClass,
         interfaces,
         getIdentifierMethodName==null ?
            null :
               getIdentifierMethodClass.getDeclaredMethod(getIdentifierMethodName, null),
            setIdentifierMethodName==null ?
               null :
               setIdentifierMethodClass.getDeclaredMethod(setIdentifierMethodName, setIdentifierMethodParams),
            componentIdType,
         id,
         null   // <-- SESSION
      );
   }
   catch (NoSuchMethodException nsme) {
      throw new HibernateException("could not create proxy for entity: " + entityName, nsme);
   }
}

In which I can see that the last argument for that CGLIBLazyInitializer.getProxy call, which is the session, is null. Of course, that is why it fails telling that there is no Session from which to re-initialize the proxy... because the reconstructed proxy never gets one.

So here my point is: could it be possible to make proxies truly serializable by making them automatically retrieve a session when deserialized?

I understand that retrieving a session will first mean being able to know which session to retrieve, but maybe something like SessionFactory.getCurrentSession() would do for all people using some sort of "OpenSessionInView" pattern...


Thanks. 

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