Found solution!
open pom.xml and replace: (line 52)
<url>http://repo.getspout.org/content/repositories/snapshots</url>
by
<url>http://repo.spout.org</url>
Same problem on win7 x64 & maven & jdk 1.7.0_05
http://repo.getspout.org/content/repositories/snapshots/ redirects to the spout forums main page
so this html page is saved as jar :(