I get a 404 (not found) on the links for the 3.1.7 distribution files...

http://repo.maven.apache.org/maven2/com/github/spotbugs/spotbugs/3.1.7/spotbugs-3.1.7.tgz

http://repo.maven.apache.org/maven2/com/github/spotbugs/spotbugs/3.1.7/spotbugs-3.1.7.zip