@Override
    public void deleteMember(String groupName, JID user)
    {
        final Group group = data.get(groupName);
        if (group != null) {
            group.getMembers().remove(user);
            group.getAdmins().remove(user);
        }
    }
A very basic implementation of a GroupProvider, that retains data in-memory.

@author Guus der Kinderen, guus@goodbytes.nl
xmppserver/src/test/java/org/jivesoftware/openfire/group/TestGroupProvider.java