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Original Documentation: http://okapiframework.org/wiki/index.php?title=Longhorn#Download_and_Installation.
Download okapi from https://bintray.com/okapi/Distribution/Longhorn
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Try to create a Okapi project via the integrated web front-end accessible via the configured Okapi URL (see readme.html, too: {localhost}/okapi-longhorn/okapi-longhorn-sample-js-client.html; see also: http://okapiframework.org/wiki/index.php?title=Longhorn#HTML-Client).
Check the tomcat for messages like:
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Translate5 Configuration of the Okapi Plug-In
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