The pom.xml published in the Maven repositories for JRuby includes a system scoped snapshot dependency for a 'requireTest' artifact. This breaks projects that try to use the JRuby pom.xml with things like the Maven assembly plugin, see the Maven error below.
See the pom.xml files published in the maven repo:
http://repo1.maven.org/maven2/org/jruby/jruby/0.9.9/jruby-0.9.9.pom
http://repo1.maven.org/maven2/org/jruby/jruby-complete/0.9.9/jruby-complete-0.9.9.pom
The Maven failure you get is:
Project ID: org.jruby:jruby-complete
POM Location: Artifact [org.jruby:jruby-complete:jar:0.9.9:compile]
Validation Messages:
[0] For dependency Dependency {groupId=requireTest, artifactId=requireTest, version=SNAPSHOT, type=jar}: system-scoped dependency must
specify an absolute path systemPath.
Reason: Failed to validate POM
Can you try adding the codehaus snapshots repository to your POM or settings, and try this version?