Hi Nithya, As Jean Vincent pointed out, following would be the modified code: XWikiObject xobj = new XWikiObject(); //Class Name is XWikiGroups xobj.setClassName("XWiki.XWikiGroups"); //Host page to which we want to add the user is the Page which contains the group //In this case, XWikiAllGroup is the group to which we want to add the user //So, we would use XWiki.XWikiAllGroup Page in the wiki xobj.setPageId("XWiki.XWikiAllGroup"); //Set member property as "XWiki.UserName" xobj.setProperty("member", "XWiki.nithya"); rpc.storeObject(xobj); And, for me the password update did work. For some reason, it was not working in the first attempt. Thanks for your help :)