How to set up init method with file constants for Spring Application?

Question

I'm pretty new in Java Spring usage, so here's my question. I need to inject some information into DB before my application starts. I mean, I know how to use @Bean init-method, but i dont't want to hardcode constants even in .properties file. Here's my temporary solution (data is changed):

@Bean
ApplicationRunner init(RoleRepo roles, UserRepo users, SettingsRepo settings, RoomRepo rooms, GroupRepo groups) {

    String[][] data_roles = {
            {"1", "ROLE_UNCOMP"},
            {"2", "ROLE_USER"},
            {"3", "ROLE_OPERATOR"},
            {"4", "ROLE_ADMIN"}
    };

    String pass = bCryptPasswordEncoder().encode("qwe");

    String[][] data_users = {
            {"1", "User0", "qwe", pass, "123"},
            {"2", "User1", "qwe1", pass, "124"},
            {"3", "User2", "qwe2", pass, "125"},
    };

    String[][] data_settings = {
            {"1", "booking_days", "3"},
            {"2", "auto_registration", "true"},
            {"3", "auto_booking", "false"},
            {"4", "urgent_booking_time", "15"}
    };

    String[][] data_rooms = {
            {"1", "Лекционный зал", "https://href1", "all_day"},
            {"2", "Малая переговорная", "https://href2", "all_day"},
            {"3", "Переговорная", "https://href3", "all_day"},
            {"4", "Скайповая 1", "https://href4", "all_day"},
            {"5", "Скайповая 2", "https://href5", "all_day"},
            {"6", "Скайповая 3", "https://href6", "all_day"},
            {"7", "Скайповая 4", "https://href7", "all_day"},
            {"8", "Скайповая 5", "https://href8", "all_day"}
    };

    String[][] data_groups = {
            {"1", "Group1"},
            {"2", "Group2"},
            {"3", "Group3"},
            {"4", "Group4"},
            {"5", "Group5"},
            {"6", "Group6"},
            {"7", "Group7"},
            {"8", "Group8"},
            {"9", "Group9"},
            {"10", "Group10"},
            {"11", "Group11"}
    };

    return args -> {
        Stream.of(data_roles).forEach(a -> {
            Role role = new Role(Long.parseLong(a[0]), a[1]);
            roles.save(role);
        });
        Stream.of(data_groups).forEach(a -> {
            Group group = new Group(Long.parseLong(a[0]), a[1]);
            groups.save(group);
        });
        Stream.of(data_users).forEach(a -> {
            User user = new User(Long.parseLong(a[0]), a[1], a[2], a[3], Long.parseLong(a[4]));
            user.setRoles(Collections.singleton(new Role(3L, "ROLE_ADMIN")));
            user.setGroups(Collections.singleton(new Group(1L, "Group1")));
            users.save(user);
        });
        Stream.of(data_settings).forEach(a -> {
            Settings setting = new Settings(Long.parseLong(a[0]), a[1], a[2]);
            settings.save(setting);
        });
        Stream.of(data_rooms).forEach(a -> {
            Room room = new Room(Long.parseLong(a[0]), a[1], a[2], a[3]);
            rooms.save(room);
        });
    };
}

But this IS hardcode, what's more, every client will have its own list of constants. Can You help me with such a solution, where it's enough to pass a file name as a .jar starter parameter/Path variable and generate defaults from that file. For example:

java jar application.jar -constants ~./User/constants.xml

Answer 1

I think you can autowire ApplicationArguments to your bean initialization method and then get file name from jar arguments.