http://demobox.github.io/jclouds-maven-site-1.6.1/1.6.1-incubating/jclouds/apidocs/org/jclouds/openstack/nova/v2_0/extensions/SecurityGroupApi.html
Thanks for that. Yes, that's indeed a naming error. The parameter should probably be called "groupId", as can be seen from the equivalent async API call [1], which is the call that actually gets made.
The SecurityGroupApi is just a "wrapper" around that...at least, until 1.7.0. ap[1] https://github.com/jclouds/jclouds/blob/master/apis/openstack-nova/src/main/java/org/jclouds/openstack/nova/v2_0/extensions/SecurityGroupAsyncApi.java#L130
