code: private void populateSagaHandlers() {
          synchronized (sync) {
              if (scanResult == null) {
                  scanResult = new HashMap<>();
                  Collection<Class<? extends Saga>> sagaTypes = scanner.scanForSagas();
  
                  for (Class<? extends Saga> sagaType : sagaTypes) {
                      SagaHandlersMap messageHandlers = determineMessageHandlers(sagaType);
                      scanResult.put(sagaType, messageHandlers);
                  }
              }
          }
      }
docs: Creates entries in the scan result map containing the messages handlers
  of the sagas provided by the injected scanner.