Re: [Proxool-developer] Summary of Cglib and Hibernate changes

[Christian N. <chr...@em...>]

Could you post the CGLIB patch?

----- Original Message -----
From: Bill Horsman <bi...@lo...>
Date: Mon, 17 Nov 2003 20:37:53 +0100
To: Proxool Developer <pro...@li...>
Subject: [Proxool-developer] Summary of Cglib and Hibernate changes

> Hi all,
> 
> I have been talking on the cglib and hibernate lists about the upcoming
> release of cglib 2 and what that means for Proxool. I thought I'd
> summarise the situation so everybody knows what is going on. It's a long
> email, so apologies in advance.
> 
> Cglib are about to release version 2. As Chris says below, this will be
> incompatible with version 1.
> 
> On Sun, 2003-11-16 at 19:08, Chris Nokleberg wrote: 
> 
> > [snip] this jar contains ASM 1.4, which is binary
> > incompatible with 1.3, so CGLIB 1.0 and 2.0 can no longer coexist
> > peacefully.
> 
> This means that if we are to upgrade to Cglib 2 then we need to make a
> few changes to Proxool (Chris has already provided a patch for this) and
> start distributing Cglib 2 with Proxool.
> 
> Okay. Why should we upgrade to Cglib 2? Well, anybody who decides to
> upgrade to Cglib 2 for other reasons is going to get problems. People
> who are likely to do that are users of Hibernate and Spring. Hibernate
> actually distribute Proxool (thanks to Martin Crawford) so they require
> Proxool to be updated in order to upgrade Cglib (which they are planning
> to do when they release 2.1 in the next 4 weeks).
> 
> So we've decided to upgrade Proxool to use Cglib 2 and will release a
> new version of Proxool shortly after Cglib 2 is released and (hopefully)
> shortly before Hibernate 2.1 is released.
> 
> The consequence of which is that Hibernate 2.0 and earlier users will
> not be able to upgrade Proxool without upgrading Hibernate. I think that
> is acceptable as long as we make people aware of that. Same goes for
> Spring.
> 
> It also means that anyone using Cglib in their own code will have to
> make changes in order to use the latest Proxool. We should probably
> provide some links in our own documentation about the best way to do
> that (without going into too much detail).
> 
> There is another option that we could think about too: providing our own
> ClassLoader. This would allow us to have Cglib 2 and Cglib 1 existing in
> certain situations. Not very pretty and it wouldn't solve the problem of
> the application code referencing Cglib 1.
> 
> Yet another option is that we use reflection to access Cglib and
> auto-detect which version is available. If Cglib 2 is unavailable we
> would resort to Cglib 1 and log a deprecation warning. This has
> benefits: 1) people can use which version of Cglib they want, and
> disadvantages: 1) code maintenance headache, 2) possible performance
> impact (although I suspect it would be minimal if done right).
> 
> There are four Proxool classes effected: ProxyConnection,
> ProxyDatabaseMetaData, ProxyFactory and ProxyStatement.
> 
> Phew. End of long message.
> 
> Regards,
> Bill Horsman
> 
> 
> 
> 
> 
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