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From "William Ferguson (JIRA)" <j...@codehaus.org>
Subject [jira] Commented: (MNG-2290) Generated URLs in POMs of child modules
Date Wed, 01 Aug 2007 23:34:13 GMT

    [ http://jira.codehaus.org/browse/MNG-2290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_103820
] 

William Ferguson commented on MNG-2290:
---------------------------------------

I realise I wasn't as clear in my comment above as I could have been. So I'll try again.

I want to be able to deploy the sites for my projects in a versioned manner.
Ie I want to retain the sites of all previously released versions of my components.
I imgaine the structure for the web site to look something like :

/SomeProject/1.0
/SomeProject/1.1
/Anotherproject/1.0
/Anotherproject/2.0
  
etc

I also want to keep my POMs as clear and simple as possible, so I try and put as much common
configuration in the common parent POM.
But the values for project#url and project#distributionManagement#site#url specified in the
parent (and not overridden in the child) will automatically have the artifactId of the child
appended to them. So there is no way to achieve the folder structure specified above using
any kind of url statement in the parent POM.

I think Maven needs to *stop* automatically appending ${artifactId} to the url and site#url
of the parent POM and instead encourage specification use of the actual url that is required,
eh http://myhost/maven-projects/${artifactId}/${version} or whatever is required.

Now I believe versioned sites is something that the Maven group as a whole was planning on
doing themselves, so this looks like an area that needs to be resolved.

> Generated URLs in POMs of child modules
> ---------------------------------------
>
>                 Key: MNG-2290
>                 URL: http://jira.codehaus.org/browse/MNG-2290
>             Project: Maven 2
>          Issue Type: Improvement
>          Components: Inheritance and Interpolation
>    Affects Versions: 2.0.4
>            Reporter: Joerg Schaible
>             Fix For: 2.0.x
>
>
> Maven has quite some elements where a URL or a path is modified automatically for child
POMs (the ones I am currently aware of):
> - url
> - scm/connection
> - scm/developerConnection
> - scm/url
> - distributionManagement/site/url
> While expanding this path with "/${pom.artifactId}" sounds reasonable, this approach
fails badly for complex projects with more hierarchy levels. Suppose we have a directory structure
like:
> * project
> ** core
> *** provider
> **** commons
> **** impl1
> In this hierarchy all POMs for _project_, _core_ and _provider_ are of package type _pom_,
while _commons_ and _impl1_ is of type _jar_. The "artifactId" approach now simply assumes
that all POMs in the hierarchy are named like the current directory. This does simply not
match. Suppose those jar artifacts are used in an enterprise or web app. Then every artifact
is located in one single directory and therefore the names have to be unique. But if you decide
to take an artifact name different to the directory name, you have to add the definition in
every POM, because the scm elements are simply wrong.
> An even worse scenario are components that can be provided using different technologies.
We have a lot of such structures:
> * component
> ** jar
> ** war
> ** ear
> * *_jar_:* the core functionality
> * *_war_:* the core functionality integrated and eccessible with a web application
> * *_ear_:* the complete component as enterprise app, if it makes sense to deploy the
functionality on a different app server
> _component_ has a POM of package type _pom_; _jar_, _war_ and _ear_ have POMs with the
according package type. All of the three POMs use the same artifactId though. In this case
not only the scm elements break, but also the URLs for the site, since they are all the same
for all three artifacts.
> All of this could have been avoided, if the expanded part is not the artifactId, but
the basename of the current directory. Especially for the scm elements, this is IMHO the only
valid assumption.
> It would already help us, if this auto-expansion could be turned off to allow the definition
of a single property in each POM for a correct interpolation of those values, but there seems
no such option ^1^. So you *have to* add those elements under all circumstances into every
POM.
> 1) The _tagBase_ of the release plugin does no such auto-expansion, which makes it quite
easy to use a property for it, that can be set individually in every POM without adding any
plugin configuration.

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