Tomek, I think I found the problem and this seems to be a bug. The file "WikiEngine.java" seems to read language codes from an xml file: "CountryCodes.xml". All the two letter language codes in this file are CAPITALIZED: | Eg: <twoLetterCode>EN</twoLetterCode> | So when this java class (WikiEngine.java) is looking for a certain language data source: WikiEngine.java (line: 120) ------------------------------- | return getByName(pageName, wikiContext, languageDataSources | .get(langCode)); | languageDataSources.get(langCode) is returning 'null' as there is no corresponding datasource for the languageCode 'en'. So instead of directly getting the language data source from the Map we can call a method that will return the language data source from the Map case insensitively. Please let me know if you are going to fix this in the above manner or whichever you find comfortable. Thanks Dayal View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3957790#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...