Yes, I have found this API and http://platform.xwiki.org/xwiki/bin/view/DevGuide/DsXWikiPreferences too. The problem is I don't understand what to pass to getProperty as params. You wrote: bridge.setProperty(<reference to XWiki.XWikiPreferences>, <reference to XWiki.XWikiPreferences>, "authenticate_view", 1); The following returns null: documentAccessBridge.getProperty("XWiki.XWikiPreferences[0]", "XWiki.XWikiPreferences[0]", "authenticate_view"); Could you write what I should pass to getProperty method, please? And to prevent future questions what should I read to solve such problems? -- View this message in context: http://xwiki.475771.n2.nabble.com/How-to-setup-Prevent-unregistered-users-fr... Sent from the XWiki- Dev mailing list archive at Nabble.com.