[xwiki-devs] Maven XAR Plugin set Hard requirement for Version

Hi devs, I'm trying to use an older version of the Maven XAR Plugin, but it seems like the version tag is only a minimum declaration. Since the project is not Java7 yet, the build fails. I tried to set the version in square brackets [${commons.version}] to require a hard version of the extension, but this shows no effect. <extension> <groupId>org.xwiki.commons</groupId> <artifactId>xwiki-commons-tool-xar-handlers</artifactId> <version>${commons.version}</version> </extension> Is there any solution or do I have to upgrade the project to Java7? Thanks and regards, Josef