Re: Business Objects vs Data Objects [was Re: JXTemplates-what' s in a name?]

[Leon Widdershoven <qa...@dds.nl>]

I know. And I also know that such a feat is not easy at all, which is at
least partially caused by the infamous jar hell. You'd have thought that
Solaris/unix people would not make the windows mistake. Alas.

I have never really understood what's special about endorsed (it overrides
the default class path?) but that application-global (with the servlet
container the application) jars require a restart is of course to be taken
for granted. It's just that I'd like to see web-application specific libraries
(the ones I use for the applications running "in" cocoon running in the
servlet container) could be reloaded. I think such a feature would prove
a strong impulse to flowscript based application development.

May the person responsible for not adding versioning to jars have
many itches daily,

Leon

Ralph Goers wrote:
> If you review the developers list you will find that the Cocoon developers
> would very much like to implement something like what you are suggesting by
> being able to dynamically deploy/redeploy/undeploy blocks.  However, there
> are significant issues that make this a non-trivial task.
> 
> Unfortunately, because Java class loaders don't have versioning support
> built in you can't just simply upgrade jars in a running system on the fly.
> You are making the assumption that upgrading a jar from one version to the
> next will always be binary compatible. This is not always the case. To make
> things worse, some of the jars have to exist in the endorsed overrides
> directory which requires a restart of your web container to change them -
> not just a redeployment.
> 
> Ralph
> 
> -----Original Message-----
> From: Leon Widdershoven [mailto:qaz@dds.nl] 
> Sent: Sunday, May 09, 2004 10:48 AM
> To: users@cocoon.apache.org
> Subject: Re: Business Objects vs Data Objects [was Re: JXTemplates-what' sin
> a name?]
> 
> I have no clue. Is there no application server which can deal with time 
> stamped libraries? The
> way dynamic generation in xsp works (not the implementation of which I 
> know next to nothing,
> but the fact that your classes are always up to date) is a very strong 
> convenience feature.
> 
> If that could be extended to the application jar's (e.g. 
> cocoon/WB-INF/lib, not tomcat/libs) in the
> way the sitemap has a check-reload that would make it so much easier to 
> develop web applications,
> especially since development seems to shift away from xsp to flowscript, 
> with the flowscript
> acting as a controller and not containing the business logic.
> 
> Leon
> 
> 
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