I was in Maven 2.0.9 until two weeks ago.
I did integration test with maven 3.0.3 and everything was working fine.
When I decided to migrate my integration system this week I upgrade to 3.0.4 and then the clean deploy failed with this error:
Could not transfer artifact groupe:artifact:pom:0.5.0-20120203.164640-2 from/to snapshots (http://archiva.company.fr/repository/snapshots/): Failed to transfer file: http://archiva.company.fr/repository/snapshots/groupe/artifact/0.5.0-SNAPSHOT/panel-0.5.0-20120203.164640-2.pom. Return code is: 301, ReasonPhrase:Moved Permanently
I don't know how to investigate the problem because it's working with 3.0.3 (Wagon enhancement ?)
I migrate to 3.0.3 but I think it's better to be with the last version.