[ http://jira.codehaus.org/browse/MNG-1356?page=comments#action_50664 ] 

Edwin Punzalan commented on MNG-1356:
-------------------------------------

This is already implemented and should be closed. All values in 
System.getProperties() can be interpolated into pom.xml.

btw, its "java.io.tmpdir" not "java.io.tmp.dir".  Maybe that's the reason why 
you can't get it interpolated?

> Java system properties should be interpolated in pom.xml
> --------------------------------------------------------
>
>          Key: MNG-1356
>          URL: http://jira.codehaus.org/browse/MNG-1356
>      Project: Maven 2
>         Type: Improvement
>   Components: maven-core
>     Versions: 2.0
>     Reporter: Vincent Massol
>      Fix For: 2.0.1

>
>
> Here's a use case where I'd need ${java.io.tmp.dir} interpolated in my 
> pom.xml:
> Some plugins output things. Some of those things can be transient and putting 
> them in ${basedir]/target is fine. However there are other cases where you 
> want to be sure that what is generated stays even after a clean. This is the 
> case for the cargo plugin which can automatically download containers. It 
> wouldn't be nice that the downloaded containers be wiped out on a clean. I'd 
> like to leave it to the user to decide where to put them and one location 
> that would be fine is ${java.io.tmp.dir} (this is the one I want to use in 
> the cargo plugin's functional tests).

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