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This is a sample showing how to write a highly available singleton using IBM WebSphere eXtreme Scale. It creates a grid with a single partition. The primary for that single partition is our singleton. The application registers a callback with WXS (ObjectGridEventListener) which is called on the JVM where that partition primary is placed. If that JVM fails then the grid will promote the replica to be a primary and invoke the callback on the new JVM and so on.

The singleton in the sample registers a googletalk listener and auto responds to instant messages sent to that google talk user.