I have a java web application where every user has own simple calendar. Now I want to add feature that user can add all events from my application into his calendar, for example google calendar, but I want support Yahoo calendar too. I was trying to find some way how to do it, but I found only one lib ([caldav4j](http://code.google.com/p/caldav4j/)) which does not have any useful example or tutorial and as far as I know it uses obsolete library [slide](http://jakarta.apache.org/slide/webdav-client.html). Is there anything different what can I use?