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From Godmar Back <god...@gmail.com>
Subject Re: Q: how to obtain notification when a WebApp is unloaded/reloaded?
Date Wed, 14 Apr 2010 14:20:44 GMT
On Wed, Apr 14, 2010 at 10:12 AM, Pid <pid@pidster.com> wrote:

> > For instance, if you look at
> >
> http://java.sun.com/products/servlet/2.3/javadoc/javax/servlet/ServletContextListener.html
> > it says:
> >
> > "To recieve (sic) notification events, the implementation class must be
> > configured in the deployment descriptor for the web application."
>
> Web applications are largely configured by the web.xml file in
> app/WEB-INF.  Servlets, listeners etc are all configured in it.
>
>
Thank you for your confirmation.  I thought I was going nuts, after having
waded through various *Facade classes, hoping to find an API method I could
call at runtime.

I have added a ServletContextListener, but it is very much a solution I
strongly dislike. The reason is that my application is layered on top of
another application (ZK), and I don't really want to touch web.xml.
'web.xml' describes how ZK is configured to run inside Tomcat or another
J2EE server. My applications runs on top of ZK, and having to go and made
changes to the underlying deployment descriptor violates basic principles of
layering.

It also creates a maintenance problem (unless an application can have
multiple .xml files that are combined to form a deployment descriptor).
Whenever ZK is updated, a new version of web.xml will be installed, and I
would then have to merge my <listener> declaration into the new file.

Just out of curiosity, what is the rationale for the (apparently deliberate)
lack of an runtime API?

 - Godmar

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