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From "Scott Carey (JIRA)" <>
Subject [jira] (MNG-4715) version expression constant
Date Fri, 30 Jan 2015 18:04:20 GMT


Scott Carey commented on MNG-4715:

child modules can either:

  ${parent.project.version} or ${project.version} to be DRY, if the references are the same
as the parent
  not list the version at all and have the parent define it in its dependencyManagement.

The only thing you can not do is reference a property in the parent/version.  All the child
modules in your reactor likely have the same version for their parent versions.  To manage
that, use the versions plugin (NOT release plugin -- that this is a mess, conflated design,
and buggy in my experience, use 'mvn versions:set' instead).

There is one situation where the message reported here causes me trouble:

I have a corporate parent pom, and I want to have its version available via a property to
all children.   I can create a property  'corporate.root.version' bound to ${project.version},
but that does not work because children re-evaluate it to their own version.  Two options
seem to work:  duplicate the version string in the corporate root -- once for its own version
declaration and again for this property, and hope nobody forgets to modify one without the
other, OR have the version string in a property, and reference it in the project version,
which leads to the warning message here.  
Is the value TRULY unstable if the property is defined in this pom, as a constant?  I don't
believe it is.

> version expression constant
> ---------------------------
>                 Key: MNG-4715
>                 URL:
>             Project: Maven
>          Issue Type: Improvement
>          Components: Dependencies, POM
>    Affects Versions: 3.0-alpha-6, 3.0-alpha-7, 3.0-beta-1
>         Environment: eclipse linux xp 
>            Reporter: Faruk
>            Assignee: Jason van Zyl
>            Priority: Critical
>             Fix For: 3.2.6
>         Attachments: untitled.JPG
> early versions, we define modules versions with expressions, and set them to the parent
> simply;
> {code:xml}
> <properties>
> 		<ibb-core-cache.version>1.0.1</ibb-core-cache.version>
> 		<ibb-core-util.version>1.0.1</ibb-core-util.version>
> </properties>
> {code}
> and then, we give this property to modules pom as expression , 
> {code:xml}
> 	<name>ik-plug</name>
> 	<packaging>jar</packaging>
> 	<version>${ibb-core-util.versionn}</version>
> {code}
> but know , it gives an error you know like this,
> {noformat}
> [WARNING] Some problems were encountered while building the effective model for ibb-parent:ibb-modules-parent:pom:1.0.0
> [WARNING] 'version' contains an expression but should be a constant. @ ibb-parent:ibb-modules-parent:${ibb-core-jars.version},
> {noformat}
> but I think that, this enhancement is causes wrong result,
> think that , if we have i project already developing about 3 years, this project has
a lot of modules, and this modules have sub modules , and this sub modules already bound to
some other modules not define in your pom, but your updates must be affect them, at this situation,
developer want to write the existing version numbers with properties to parent pom, and want
to manage them like this. at the attach file below , the close projects are belongs to open
projects, but they are the different team developing this. I cant force the other developers
to cache their versions, I must use this versions as initial step

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