Not trivial. GroupsList should be sorted
http://docs.jboss.org/ejb3/app-server/HibernateAnnotations/reference/en/html_single/index.html#entity-mapping-association-collections
http://code.google.com/p/google-web-toolkit/issues/detail?id=2906

Enhancement #478: Members of a group should be alpha ordered in user interface

• Author: Vicente J. Ruiz Jurado
• Status: New
• Priority: Normal
• Assignee:
• Category: Group Social Network
• Target version:
• Resolution:
• Tags:

The members of a group should be alphabetical ordered in user interface