The APPIA implementation provides group communication with the Quality of Service defined on configuration. As a protocol composition framework, the application can use APPIA to define its own QoS in the communication, such as simple group communication, group membership, virtual sysnchrony, atomic broadcast, among other configurations. The current implementation supports also open and closed groups. Please see the APPIA home page for further details: http://appia.di.fc.ul.pt
Since the release 4.0.0, Appia is fully compliant with jGCS. To use jGCS with Appia just download the version 4.0.0 or greater. If you wish to use previous Appia releases, download Appia from its web page and the Appia binding from the jGCS download page.