Instead of using a StateMachineListener interface one option is to use a StateMachineInterceptor. One conceptual difference is that an interceptor can be used to intercept and stop a current state change or transition logic. Instead of implementing full interface, adapter class StateMachineInterceptorAdapter can be used to override default no-op methods.

Interceptor can be registered via StateMachineAccessor. Concept of an interceptor is relatively deep internal feature and thus is not exposed directly via StateMachine interface.

stateMachine.getStateMachineAccessor()
    .withRegion().addStateMachineInterceptor(new StateMachineInterceptor<String, String>() {

        @Override
        public StateContext<String, String> preTransition(StateContext<String, String> stateContext) {
            return stateContext;
        }

        @Override
        public void preStateChange(State<String, String> state, Message<String> message,
                Transition<String, String> transition, StateMachine<String, String> stateMachine) {
        }

        @Override
        public StateContext<String, String> postTransition(StateContext<String, String> stateContext) {
            return stateContext;
        }

        @Override
        public void postStateChange(State<String, String> state, Message<String> message,
                Transition<String, String> transition, StateMachine<String, String> stateMachine) {
        }

        @Override
        public Exception stateMachineError(StateMachine<String, String> stateMachine,
                Exception exception) {
            return exception;
        }
    });