On 10/12/2010 9:19 PM, Bryan Loofbourrow wrote:
What is the semantic difference between multiple POMs and a single POM containing the
different module lists in profiles? It seems like the former is harder to support
because a change outside the module sets requires changing every POM.<<
Well, one difference is a separation of developer concerns from the concerns of
the consumers of your artifacts. This is especially applicable if the pom
containing the profiles is the parent pom of your project, that actually gets
deployed to a repository and consumed by those who consume your software.
More subtly, I'd argue that the profiles are "magic beans," things for which
you have to introspect your source code to know what's going on, and not really knowing,
without extensive examination, whether these profiles have any effect on any of the
projects in the child tree. In contrast, a developer-facing pom is a distinct file whose
purpose can be made quite clear at the file system level, and whose purpose is
unambiguously contained entirely within the file itself.
Descending down to the final level of abstract mysticism, I'd also say that the profiles represent
a "last resort" in the context of "The Maven Way," a thing you do not use
unless you must. Yes, we use them -- for things like telling the build to execute integration tests
that depend on the presence of an active database whose location you have defined in a settings.xml
file. But for a trivial purpose like this, they are overkill.
+1.
Ron
-- Bryan
-----Original Message-----
From: Brian Topping [mailto:topp...@codehaus.org]
Sent: Friday, December 10, 2010 5:37 PM
To: Maven Users List
Subject: Re: Reasonable use of profiles?
On Dec 10, 2010, at 8:08 PM, Bryan Loofbourrow wrote:
You don't need separate projects for this. You just need a bunch of developer-facing
pom files with different<modules> lists. They can certainly live in the same
directory. This is something we definitely take advantage of, for producing
interesting developer build sets.
What is the semantic difference between multiple POMs and a single POM
containing the different module lists in profiles? It seems like the former is
harder to support because a change outside the module sets requires changing
every POM.
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