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From "KARR, DAVID (ATTSI)" <dk0...@att.com>
Subject RE: Reasonable use of profiles?
Date Fri, 10 Dec 2010 18:24:27 GMT
> -----Original Message-----
> From: Kalle Korhonen [mailto:kalle.o.korhonen@gmail.com]
> Sent: Friday, December 10, 2010 9:58 AM
> To: Maven Users List
> Subject: Re: Reasonable use of profiles?
> 
> On Fri, Dec 10, 2010 at 9:20 AM, KARR, DAVID (ATTSI) <dk068x@att.com>
> wrote:
> > Another desire I have is to allow for developers not even building
> most
> > of the modules, and just letting the "ear" project pull snapshot
> > artifacts from the Nexus repo (built by the release team or
> continuous
> > integration).  I could do this with multiple "build" projects,
> including
> > different sets of "module" elements.  That seems messy, however.  I
> wish
> > I had different options for setting that up, perhaps in a profile,
> but I
> > don't see how that could work.
> 
> Overall, I'd say this sounds better than trying to (mis-)use profiles.
> Nothing you said indicates to me that the EARs are functionally
> equivalent, and therefore I'd create different modules for different
> EARs. One of the Maven ground rules is one artifact per module.
> Typically you deviate from that plan only if you need to build
> different versions of the same module (packaged differently, for
> different OSes/JVMs etc.) and often you use profiles for the desired
> effect. I'd further say using profiles should never be your first
> option. Reserve profiles for the time you really need them.

To clarify the use case I'm talking about here, let's say the EAR requires 20 principal artifacts
to construct the EAR (not to mention the numerous third-party dependencies).  These have a
1-1 correspondence to modules.  Some developers will work on one set of those modules (one
or more), and other developers will work on other sets.  No developers will work on all of
the modules, but all developers need all of the produced artifacts in order to produce an
EAR.  So, if I only do work on one module, I could produce a build project that just has two
modules, the module I work on, and the "EAR" module.  I would get the other artifacts from
the Nexus repo.  Other developers would have to use a different build project, with a different
set of modules, including the "EAR" module.  Other developers would have a build project with
a still different set of modules, including the "EAR" module.

>From what I can tell, my only option is to create these numerous very similar "build"
projects, all with different permutations of the available modules.  Release management would
never use these, these are just for developers.

I'm simply looking for a better way to manage this.  I envision if I somehow had a "list"
property, consisting of module names, defined in "settings.xml", a developer could easily
add or subtract from this list, and a single "build" project would use that property.  I just
don't know how to get something like this to work with Maven.

> Since you are going to re-work the build, I'd mercilessly refactor it
> into a modular build now. Since Maven is so good at versioning things,
> your build doesn't have to be monolithic. Snapshots are ok, but it's
> far better if you can identify common, stable areas of the codebase
> and simply release them separately. Then your top-level builds are
> mostly assembling things together rather than compiling/building them.
> Personally, I'd put my efforts on making the build modular, automating
> version migration and doing more continuous integration & testing
> rather than trying to force Maven the same logic as your Ant build.
> Depending on the size of the project and your team, it would likely be
> beneficial to pay somebody who really knows Maven to assist you in the
> migration at this point (if you can get it approved, I know how it
> is). It would save you from a lot of grief later.

What I have the leeway to produce is a structure that is compatible with Maven, but will still
work with the Ant build.  I can't bring down the entire development process while I single-handedly
construct the Maven infrastructure.  It was hard enough to get permission to even examine
Maven.  Each of our individual projects will produce a single artifact, whether from Ant or
Maven, and the responsibility for assembling the EAR is now separated into a separate "build"
project.  That will allow me to integrate Maven with less pain after the slightly transformed
Ant build is working.


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