[xwiki-devs] Creating groups and adding users to them

Hi, sorry for being thick, but I can't find any documentation at all how to do this in Java and I still need some help with this. In our authenticator I'd like to check if users coming from a certain angle (i can check on that through cookies) are in a special group. If they are not, I'd like to add the to this group. Furthermore this group needs to asserted of, so I need to be able to reliably find out if it does exist and if not, create it. So far I've been frustrated by failure by attempting to use the XWikiGroupService to achieve this. Also I don't seem to be able to find a clean documentation on how users and groups and done in XWikI (in java, especially). Is there such documentation? The following code, to much bewilderment, creates a USER?! public void checkPortalGroup(XWikiContext context) { if (!_portalGroupChecked) { try { boolean groupExists = false; List<String> groupList = context.getWiki().getGroupService(context).listAllGroups(context); for (ListIterator<String> groups = groupList.listIterator(); groups.hasNext() && !groupExists;) { groupExists = groups.next().equals(PORTAL_GROUP_NAME); } if (!groupExists) { log.info("Group "+PORTAL_GROUP_NAME+" does not exist and will be created."); BaseCollection portalGroup = context.getWiki().getGroupClass(context).newObject(context); portalGroup.setName(PORTAL_GROUP_NAME); context.getWiki().getHibernateStore().saveXWikiObject((BaseObject) portalGroup, context, true); } } catch (XWikiException e) { log.error("Exception while locating or creating group "+PORTAL_GROUP_NAME+" : "+e.getMessage()); e.printStackTrace(); } _portalGroupChecked=true; } } I need some serious pointers on how the xwiki objects/classes thing is supposed to work for users/groups. Thanks a lot, J.L.Simon