Exception handling
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Exceptions from listeners
Event though KStateMachine assumes that listener callbacks should not throw exceptions, it may happen in practice. If your app code throws exceptions in a listener callbacks library catches them, completes transition successfully and passes the first occurred exception to listenerExceptionHandler. It simply rethrows exception by default, but you may want to mute them with custom handler for example.
Other exceptions
Exceptions coming from other client code callbacks, that are considered to be no-throwing (like guard functions of transitions) are not caught. Machine will be automatically destroyed with destroy() function on such exceptions, as it is in unpredictable state and cannot be used anymore. Calling processEvent() on destroyed machine will throw also.