I need to implement event based calender in java i.e similar to Google calender in java. i have searched for the open source calenders written in java like bedework, ical4j, joda-time etc. but it did not work at all. i want to integrate open source Google calender in java with my application using java, tomcat. This is very urgent requirement for my project. Can anyone please suggest the link or which is the best open source calender written in java to integrate, run and customize for my project?