I have realized that method "SimpleProcessStorage.saveOrUpdate(ProcessInstanceInfo processInstanceInfo)" is never called after signaling any event (it is only called once after process start). This way, the storage cannot update and store the current state of the process after receiving the signal. If method "SimpleProcessStorage.findProcessInstanceInfo(Long processInstanceId)" is called after first signal (for example before second signal), it returns an old state of process which is still waiting for first signal.
Am I missing something? Is it really a bug?
Cheers