1. A system comprising: a message server that is configured to be restarted after a failure without performing state recovery operations; and a plurality of instances of an application server coupled in a star topology with the message server at a center of the star topology, the message server handling communications between the plurality of instances of the application server, one or more of the plurality of instances to register or reregister instance-specific information with the message server upon a starting or restarting, respectively, of the message server, the instance-specific information identifying one or more services that the one or more of the plurality of instances is configured to provide to each of the plurality of instances.