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From Jörg Hohwiller (JIRA) <j...@codehaus.org>
Subject [jira] Commented: (MNG-3377) Build reactor from toplevel pom
Date Wed, 03 Jun 2009 05:36:42 GMT

    [ http://jira.codehaus.org/browse/MNG-3377?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=179100#action_179100
] 

Jörg Hohwiller commented on MNG-3377:
-------------------------------------

After getting deeper into maven, I now understand that there is a problem:
In case of an @aggregator Mojo, maven gives away the control which project to process and
delegates it to the Mojo. This finally means that an @aggregator Mojo would NOT work as expected
when using this feature.
I do NOT want to start the discussion whether this was a misleading design decision or not.
However this initial issue does NOT make sense and the intention might be addressed by MNG-2675.


> Build reactor from toplevel pom
> -------------------------------
>
>                 Key: MNG-3377
>                 URL: http://jira.codehaus.org/browse/MNG-3377
>             Project: Maven 2
>          Issue Type: Improvement
>            Reporter: Jörg Hohwiller
>
> The following is all about multi-project environments.
> For many maven calls the result differs if you perform you mvn command on the toplevel
project
> or in a specific module. In the latter case the related modules of the projects are not
included in the reactor
> causing the result to be invalid or the build to fail.
> There should be a way that I can call maven within a particular module causing the reactor
> to be build from the toplevel pom while walking the relativePath (defaults to ../pom.xml)
upwards 
> until a pom is reached, that has no parent. From that pom the reactor should be build,
> while the actual build should work on the module where maven was invoked.
> A typical example use-case would be the command "mvn eclipse:eclipse".
> Right now it does not create project-internal dependencies if it is called
> within the module. This is especially nasty when you have a local sandbox
> module that should not (yet) be committed. Then you always need to add it
> as extra module to your parent pom, call eclipse:eclipse and then revert the changed
pom.
> Additional use-cases are that you want to build a specific module rather than
> the entire project. Right now you need to enter the module, give "mvn install" a try.
> If it fails, you will see which dependency is missing. Then you go there before
> and try "mvn install" there. This process is iterated until the first "mvn install" completes.
> This is very inconvenient. However fixing such problems as well would
> cause that not only the modules are added to the reactor but that the actual mvn call
> is also applied to the dependend modules that are in the reactor.
> This specific issue might need some extra discussion...
> For reasons of compatibility the suggested improvement could/should be
> activated by a specific commandline option (somehow the opposite of "-N").
> A suggestion would be "-R" for reactor and recursive.

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