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From David Le Strat <dlest...@yahoo.com>
Subject Re: [OJB] [J2] [OJB-PATCH] ClassHelper Patch.
Date Tue, 01 Jun 2004 21:21:02 GMT
Super! Thanks for the quick turn around.

Regards,

David.

--- Thomas Dudziak <tomdz@first.gmd.de> wrote:
> On Mon, 31 May 2004, David Le Strat wrote:
> 
> > Hello there,
> > 
> > I am cross posting this message to both
> Jetspeed-Dev
> > and OJB-Dev lists as this patch impacts both
> projects.
> > 
> > The following J2 issues describe in more detail
> the
> > reason for this patch.
> > 
> > http://nagoya.apache.org/jira/browse/JS2-48
> > http://nagoya.apache.org/jira/browse/JS2-56
> > 
> > The Jetspeed 2 development team ran in an issue
> with
> > OJB in the context of web application using
> > cross-context functionality (which we have to
> > implement to be able to comply with JSR168).
> > 
> > OJB in its current form cannot be used by web
> > applications using cross-context functionality. 
> The
> > problem is caused by the way OJB dynamically
> creates
> > new class instances: Class.forName("className",
> > currentThread.getContextClassLoader()).
> > 
> > When a web app A (e. portlet app) wants to
> dynamically
> > instantiate a new class which is local to web app
> B
> > (e.g. Jetspeed), it needs the classloader of web
> app B
> > to do so.  This can easily be done by using the
> > classloader from an already instantiated class
> from
> > web app B:
> >
>
Class.forName("className",instanceFromWebAppB.getClassLoader());
> > 
> > What clearly won't work is:
> >
> instanceFromWebAppA.getClass().forName("className").
> > 
> > The enclosed patch extends the
> > org.apache.ojb.broker.util.ClassHelper to allow
> > external application to specify the class loader
> that
> > should be used by OJB.  This allows us in the
> example
> > above to tell OJB to use the web app B (Jetspeed)
> > classloader in specific circumstances.
> > 
> > Please post to both list to discuss any issues you
> may
> > have with that patch.
> 
> Is integrated in CVS. I also replaced the remaining
> hardwired usages of
> the context classloader so that OJB should now use
> this class loder for
> all its tasks including resource loading (except for
> logging which I'm 
> currently working on).
> 
> Tom
> 
> 
>
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