I just had to download org.mortbay.jetty-5.1-SNAPSHOT.jar and org.mortbay.jetty-5.1-SNAPSHOT.jar.md5 manually from http://www.ibiblio.org/maven/jetty/jars/ to my .maven/repository/jetty/jars directory, cause the size of these files was 0 Bytes after a failed build.
-- Ralf
