Hazelcast is an open source clustering and highly scalable data distribution platform for Java, which is:
Lightning-fast; thousands of operations/sec.
Fail-safe; no losing data after crashes.
Dynamically scales as new servers added.
Super-easy to use; include a single jar.
Hazelcast is pure Java. JVMs that are running Hazelcast will dynamically cluster. Although by default Hazelcast will use multicast for discovery, it can also be configured to only use TCP/IP for environments where multicast is not available or preferred.