Hello, first I would like to say thank you for your reply, and tell you I use XEM 4.0. I use the code bellow to authorize a user and the same time to assign in a group, if he/she doesn't exist. The problems is when the code performs the assignment in a group, since you are not logged in, you are a XWikiGuest, the group page have to have explicit rights (edit) for the guest. /** * * @author jdurancal */ @Component public class LTIAuthServiceImpl extends XWikiAuthServiceImpl { @Override public Principal authenticate(String username, String password, XWikiContext context) throws XWikiException { XWikiServletRequest request = (XWikiServletRequest) context.getRequest(); if (!context.getAction().equalsIgnoreCase("logout")) { try { LTIEnvironment LTIEnvironment = new LTIEnvironment(request); if (LTIEnvironment.isAuthenticated()) { String usernameLTI = LTIEnvironment.getUserName(); if (usernameLTI.contains(":")) { usernameLTI = usernameLTI.split(":")[1]; } // get the group to assigna to the user. String group = LTIEnvironment.getParameter("custom_groups"); return syncUser(usernameLTI, group, context, LTIEnvironment.isInstructor()); } else { Exception lastException = LTIEnvironment.getLastException(); System.out.println("Error LTI authentication " + (lastException != null ? lastException.getMessage() : "")); } } catch (Exception ex) { System.out.println("Execption authentication " + ex); } } // Fallback on standard XWiki authentication return super.authenticate(username, password, context); } /** * Creates the user if he doesn't exist in the XWiki repository. User is assigned * to the default XWikiAllGroup * @param user * @param context * @throws com.xpn.xwiki.XWikiException */ protected Principal syncUser(String user, String groupName, XWikiContext context, boolean isInstructor) throws XWikiException { String xwikiUser = super.findUser(user, context); String wikiNameShow = context.getDatabase(); System.out.println("["+wikiNameShow+"] usernameLTI="+user+", GroupsLTI:"+groupName); if (xwikiUser == null) { System.out.println("["+wikiNameShow+"] LTI Create user: User " + user + " does not exist"); String wikiname = context.getWiki().clearName(user, true, true, context); context.getWiki().createEmptyUser(wikiname, "edit", context); System.out.println("["+wikiNameShow+"] LTI Create user: User " + user + " has been created"); xwikiUser = "XWiki."+user; // if the user is "instructor", assign admin rights except in speakapps wiki if (isInstructor && !context.getWiki().getName().equalsIgnoreCase("speakapps")) { try { this.addUserGroup(xwikiUser, user, "XWikiAdminGroup", context); }catch(Exception ex) { System.out.println("["+wikiNameShow+"] Execption adding admin user "+ex); } } } // És un group però no és l'administrador if (groupName != null && !groupName.equalsIgnoreCase("XWikiAdminGroup")) { try { this.addUserGroup(xwikiUser, user, groupName, context); }catch(Exception ex) { System.out.println("["+wikiNameShow+"] Execption adding user a \""+groupName+"\" group "+ex); } } return new SimplePrincipal(context.getDatabase() + ":" + xwikiUser); } private boolean addUserGroup(String xwikiUser, String user, String groupName, XWikiContext context) throws XWikiException { boolean isAdded = false; Group group = Group.getGroup("XWiki", groupName, context); if (group != null && !group.isMember(xwikiUser, context)) { if (group.addUser(user, context)) { group.save(context); isAdded = true; System.out.println("["+context.getDatabase()+"] add a \""+groupName+"\" member " + xwikiUser); } } return isAdded; } } Best regards. -- View this message in context: http://xwiki.475771.n2.nabble.com/How-to-add-a-user-to-a-group-programmatic… Sent from the XWiki- Dev mailing list archive at Nabble.com.