Hello, I had the very same problem today. The MindMap xar was installed and a MindMap space appeared, but visualization failed with CNFE until I put the jar in WEB-INF/lib. Then... xWiki refused to start anymore. I had to remove the jar in order to fix the tomcat launch. Precisely, what I did was dowloading freemind-browser-0.9.0.zip, unzipping it in a new webapps/freemind directory, then creating a *symbolic link* as webapps/xwiki/WEB-INF/lib/freemind.jar targeting webapps/freemind/freemindbrowser.jar ; then NPE occured related to log4j (log4j-1.2.16.jar is present in xwiki libs, but it might not be sufficient ?) Thanks in advance for any help. -- View this message in context: http://xwiki.475771.n2.nabble.com/MindMap-Macro-ClassNotFoundException-freem... Sent from the XWiki- Users mailing list archive at Nabble.com.