private Map<Pair<Type, Boolean>, Function<User, Boolean>> functionInterfaces = new HashMap<>();
 {
    functionInterfaces .put(Pair.of(Type.MY_TYPE, Boolean.TRUE), MySpringService::myTypeMethod);
 }

public static boolean myTypeMethod(User user)

private static final MySpringService mySpringService = ApplicationInitializer.getAppContext().getBean(MySpringService.class);