If you are having problems with Tomcat 5.x and JSPWiki with UTF-8, please note the following!

You have to edit server.xml of Tomcat (is in the conf-directory of Tomcat). Please add to

<Connector port="8080"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               debug="0" connectionTimeout="20000" 
               disableUploadTimeout="true"/>

the term 'URIEncoding="UTF-8"'.

It should look like that:

<Connector port="8080"
               maxThreads="150" minSpareThreads="25" maxSpareThreads="75"
               enableLookups="false" redirectPort="8443" acceptCount="100"
               debug="0" connectionTimeout="20000" 
               disableUploadTimeout="true" 
               URIEncoding="UTF-8"/>