this is normally done when you run ant webtests from your JSPWiki workspace, but when it fails ("Java result: 1"), you start debugging, expanding the command, shows you the following command:
java -jar tests/lib/selenium-server-1.0-beta1.jar -htmlSuite '*firefox' 'http://localhost:19041/' /home/metskem/workspace/JSPWiki/tests/build/webtests/test-container/selenium/TestSuite.html /tmp/ff.sel.log