Re: [Springframework-developer] Re: [Springframework-user] applicationContext.xml for servlet 2.2

[Colin S. <col...@ex...>]

I think it's great to keep features in there that are at no cost allow 
the framework to still work in legacy environments.  I would only make 
the comment that I hope in the future if there are compelling features 
that only work in a Servlet 2.3+ environment, the need to maintain 2.2 
compatibility would not be an impediment to adding them.

(As an analogy, Ant up to and including 1.5.3 has a few incredibly 
annoying classloading limitations, primarilly due to the fact that they 
wanted to maintain JDK 1.1 compatibility. However for the benefit of the 
1% of ant users who need JDK 1.1 compatibility, the other 99% have 
suffered somewhat.)


jürgen höller [werk3AT] wrote:

>Hi Darren,
> 
>You're actually the first one to ask for reviving ContextLoaderServlet ;-) But anyway, you got a point with large corporations and their lagging behind in terms of updates. I've already re-added the loader servlet, I'll commit it tomorrow.
> 
>Of course, the ContextLoader delegate already allowed being called in a single line from within a custom startup servlet. So we're now re-adding ContextLoaderServlet for pure convenience on Servlet 2.2, to avoid the need for a custom startup servlet with a ContextLoader.initContext call.
> 
>Frankly, I haven't been aware that the listeners have been our only Servlet 2.3 dependency. But the main reason for removing the loader servlet was consistency: We also got WebAppRootListener and Log4jConfigListener, and splitting each of them into a listener, a servlet, and a delegate class too seemed like overkill. Do you see any need for this?
> 
>Log4jConfigListener is just necessary for custom config file locations and config modification detection. It includes the functionality of WebAppRootListener, which exports the web app root directory to a system property, mainly for use within Log4J log file paths (a la ${webapp.root}/WEB-INF/mylog.txt to get a log file within the web app).
> 
>Regards,
>Juergen
> 
> 
>
>	-----Ursprüngliche Nachricht----- 
>	Von: dar...@hs... [mailto:dar...@hs...] 
>	Gesendet: Mo 11.08.2003 17:40 
>	An: spr...@li... 
>	Cc: 
>	Betreff: [Springframework-developer] Re: [Springframework-user] applicationContext.xml for servlet 2.2
>	
>	
>
>
>
>	Would there be any interest in reviving the skeleton of the old i21 servlet
>	that used to do this, just for the sake of backwards compatibility - at
>	least for a while?  I know it *is* a step backwards, but many large
>	corporations do have a habit of moving reluctantly to newer versions of
>	application servers and plenty may appreciate the gesture.  Seems a shame
>	to push this framework activity into the application domain when it's only
>	a dozen lines of code and it looks to be the only thing preventing servlet
>	2.2 compatibility for the MVC codebase.
>	
>	Attached is a modified version of the servlet with suitable @deprecated
>	tags and comments for consideration.  It should have no impact on any
>	existing code from 0.9.1
>	
>	All the best,
>	Darren.
>	
>	(See attached file: ContextLoaderServlet.java)
>	
>	<quote>
>	Hi Darren,
>	
>	You're right, Spring assumes Servlet 2.3 in that it recommends listeners
>	for startup work, like ContextLoaderListener and Log4jConfigListener. We
>	compile against Servlet 2.3, so there might be some other dependencies too,
>	but none that I can think of at the moment.
>	
>	If you look at the implementation of ContextLoaderListener, you'll find
>	that it just delegates the contextInitialized event to
>	ContextLoader.initContext(event.getServletContext()). So in a Servlet 2.2
>	container, you could write your own load-on-startup servlet that invokes
>	ContextLoader.initContext in its init method, among other custom startup
>	work that you may require, like Log4J initialization.
>	
>	Regards,
>	Juergen
>	
>	
>	
>	 -----Ursprüngliche Nachricht-----
>	 Von: Darren Davison [mailto:da...@da...]
>	 Gesendet: So 10.08.2003 21:19
>	 An: spr...@li...
>	 Cc:
>	 Betreff: [Springframework-user] applicationContext.xml for servlet 2.2
>	
>	
>	
>	 hi,
>	
>	 All of the example web projects load the applicationContext with a
>	
>	 <listener>
>	   <listener-class>
>	     com.interface21.web.context.ContextLoaderListener
>	   </listener-class>
>	 </listener>
>	
>	 which is servlet 2.3 specific.  Is there a supported/recommended way to
>	 make
>	 this work for servlet 2.2?
>	
>	 Regards,
>	
>	 </quote>
>	
>	
>	 Darren Davison
>	 CIBM Intranet Team
>	 int> 799 19431
>	 ext> +44 (0)20 7991 9431
>	
>	
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