The build currently fails with another error: [INFO] --- exec-maven-plugin:1.6.0:exec (install gems) @ ruby-tools --- LoadError: no such file to load -- rubygems/installer require at org/jruby/RubyKernel.java:961 <main> at /build/jruby-maven-plugins-1.1.5+ds1/ruby-tools/src/main/scripts/install_gems.rb:1 [ERROR] Command execution failed. org.apache.commons.exec.ExecuteException: Process exited with an error: 1 (Exit value: 1) at org.apache.commons.exec.DefaultExecutor.executeInternal (DefaultExecutor.java:404) at org.apache.commons.exec.DefaultExecutor.execute (DefaultExecutor.java:166) at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:804) at org.codehaus.mojo.exec.ExecMojo.executeCommandLine (ExecMojo.java:751) at org.codehaus.mojo.exec.ExecMojo.execute (ExecMojo.java:313) at org.apache.maven.plugin.DefaultBuildPluginManager.executeMojo (DefaultBuildPluginManager.java:134)