Don't worry, I'm aware that Maven 2.2.1 is actual the prefered version...
I found the failure: camel/buildingstools/pom.xml has the version 2.7-SNAPSHOT In camel/pom.xml, we have a property "camel-buildtools.version", which have the version "2.6.0". If I change this version to "2.7-SNAPSHOT", everyting goes well. Any objections?