We do it quite extensively now. The problem is that I'm now dependent on
an alpha war plugin that doesn't have the timestamp logic. I use the
dependency:unpack goal to unpack the artifacts in a known order (to
control order of inheritence) into the war folder before the war plugin
starts. Then the war plugin will copy files over so local files always
win. 

We have our code architected such that there is a common ui template
that every war "inherits." Then we may have several ui modules that can
be reassembled into a final war package. (not always 1:1, sometimes a UI
can be included in several packages and all assemblies almost always
have multiple Uis). For unit testing purposes, all the ui's including
the common template are deployable standalone. When I build the war in
each of these modules, I actually build 2: I "normal" one for standalone
deployment, and one reusable one that doesn't contain the jars. The
problem is that since maven won't transitively inherit the war's
dependencies, we manually have to make sure that the assembly project
has all the direct dependencies copied from each of the UI poms. 

-----Original Message-----
From: Michael Horwitz [mailto:[EMAIL PROTECTED] 
Sent: Wednesday, November 15, 2006 9:31 AM
To: Maven Developers List
Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]
Subject: Re: [appfuse-dev] War plugin overlays: New plugin to handle
transitive dependencies

It would be nice! In AppFuse only one war is ever overlayed. I am
guessing here, but would imagine that projects that overlay more than
one war will be pretty rare. For AppFuse it would be sufficient to
prioritise the local files over those coming in from the overlay, which
is a good deal simpler than overlay ordering? Does anyone have a
specific need to overlay more than one war dependency?

On 11/15/06, Brian E. Fox <[EMAIL PROTECTED]> wrote:
>
> I think it's also necessary to allow control over the ordering of the 
> overlay.  Otherwise it's kinda random based on the way the 
> dependencies are resolved isn't it?
>
> -----Original Message-----
> From: Matt Raible [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, November 14, 2006 1:56 PM
> To: [EMAIL PROTECTED]
> Cc: [email protected]
> Subject: Re: [appfuse-dev] War plugin overlays: New plugin to handle 
> transitive dependencies
>
> Just some thoughts on enhancements:
>
> It'd be nice if we could 1) get this into the war plugin and 2) add 3 
> different modes:
>
> 1. Default - the way things are now, where dependencies aren't 
> inherited.  This would allow backwards compatibility and not suprise 
> anyone.
>
> 2. Include Dependencies - excludes everything from WEB-INF/lib and 
> includes all dependencies - making them available to all plugins as 
> well (i.e. esp. IDEA, Eclipse and NetBeans).
>
> 3. Merge - has a way of allowing web.xml and other configuration files

> to be merged.  Of course, it'd need certain include and exclude 
> patterns.
>
> With #3, it may be possible to produce some sort of wars-as-plugins 
> features where you could develop a small set of functionality and 
> "merge" it into a larger application.  This seems like a pretty simple

> way to do plugins. Of course, you'd probably have to create a pretty 
> fancy XML parser/merger/munger.
>
> Thoughts?  What are the chances of getting this plugin included in the

> war plugin?
>
> Matt
>
> On 11/11/06, Michael Horwitz <[EMAIL PROTECTED]> wrote:
> > Hi,
> >
> > I have been helping out with the development of the AppFuse project 
> > over the last month where we make heavy use of the war overlay 
> > feature
>
> > in the Maven war plugin. It is a really nifty feature!
> >
> > To get max power with war overlays I have developed the Warpath 
> > plugin
>
> > that allows projects to use war artifacts as fully fledged 
> > dependencies. In
> > brief:
> >
> > 1) The contents of the /WEB-INF/classes directory in the war 
> > dependency artifacts can be included in the project's classpath for 
> > normal compile, etc tasks.
> > 2) Transitive dependencies from the war dependency artifacts become 
> > available for use by other plugins, e.g. compile and ear - so no 
> > more having to include all the dependencies when creating skinny
wars!
> >
> > The plugin has now been actively used in the AppFuse project for the

> > last few months, and I feel it is at a point where it is both usable
> and stable.
> > Would the war plugin team be interested in including the warpath 
> > functionality inside the war plugin? It would seem to be the most 
> > natural place to host it.
> >
> > As a side issue one sticking point for us with war overlays has been

> > the overlay by timestamp for files included in the web project being

> > built. In a multi-web module project like AppFuse this has led to 
> > some
>
> > unpredictable behaviour when a file from a dependent war overwrites 
> > a file in the war project being built. Although it is possible to 
> > influence the behaviour of the overlay using dependentWarExcludes, 
> > it is a maintenance heavy approach when many files are involved and 
> > requires continual updates to the project's pom file.
> >
> > Would it be possible to include functionality, perhaps as a 
> > configurable feature, in the Maven war plugin to automatically 
> > prefer all files from the war project being built over those from 
> > dependent war files regardless of file timestamp? I would be more 
> > than happy to do the necessary work and submit a patch.
> >
> > Thanks
> >
> > Mike Horwitz
> >
>
>
> --
> http://raibledesigns.com
>
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