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You could use akka[1] library to build a state machine, actor model is great for building state machines [2]. I have built one in the past using akka. Library is pretty robust and well maintained.

[1] http://akka.io [2] http://erlang.org/documentation/doc/4.8.2/doc/design_princip... [3] http://doc.akka.io/docs/akka/current/java/fsm.html

It looks nice, but overkill for my application. For now I have no need for distributed systems, probably some concurrency in the near future.

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