Re: [Hibernate] Hooking into Hibernate classloader

[Gavin K. <ga...@ap...>]

I think its better to do this kind of thing by subclassing EntityPersister
and overriding instantiate(). However, that will not work properly in the
current implentation (for example getPersister( object.getClass() ) would
fail). Would you please investigate what kind of changes would be required
to make this approach work?

----- Original Message -----
From: "Chris Nokleberg" <ch...@si...>
To: <hib...@li...>
Sent: Wednesday, November 06, 2002 10:27 AM
Subject: [Hibernate] Hooking into Hibernate classloader


> I'd like to dynamically wrap my persistent classes using CGLIB or JDK1.3
> proxies to provide things like getters for metadata which aren't in the
> compiled class file. I've done some searching and it appears that all of
the
> persistent classes are loaded by Hibernate using
>
>   cirrus.hibernate.helpers.ReflectHelper.classForName(String)
>
> which is implemented as:
>
>   public static Class classForName(String name) throws
ClassNotFoundException {
>       try {
>   return Thread.currentThread().getContextClassLoader().loadClass(name);
>       } catch (Exception e) {
>   return Class.forName(name);
>       }
>   }
>
> One option would be to try to set the current context class loader before
> Hibernate starts loading classes. But that is error-prone, I think.
Another
> way would be to add a method to set the classloader to use. But really I'd
> just prefer a simple callback interface:
>
>   public interface HibernateClassLoader {
>      public Class loadClass(String name) throws ClassNotFoundException;
>   }
>
> I guess the loader would be configurable per-datastore?
> If there's a better way, let me know.
>
> Thanks,
> Chris
>
>
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