Today’s applications are getting more and moredistributed everyday and it is well-known that distributed programming is hard. With Hazelcast though, distributed programming is easy and lots of fun. Common reaction of Hazelcast users is ‘Ooh my God, this cannot be that easy’. Hazelcast is an open source, highly scalable, transactional, distributed/partitioned implementation of queue, map, set, list, lock and executor service for Java.