Wikipedia
JGroups
JGroups is a reliable multicast system written in the Java language.
JGroups adds a "grouping" layer over a transport protocol, internally keeping a list of participants. This list is used to:
- Make the application aware of the listeners
- Make some or all transmissions reliable
- Allow totally ordered transmissions
JGroups is a toolkit for reliable multicast communication. It can be used to create groups of processes whose members can send messages to each other. JGroups enables developers to create reliable multipoint (multicast) applications where reliability is a deployment issue. JGroups also relieves the application developer from implementing this logic themselves. This saves significant development time and allows for the application to be deployed in different environments without having to change code.