/top/{top_id}/<some string>
ex:

/top/{top_id}/book

/top/{top_id}/pen

/top/{top_id}/dog

/top/{top_id}/middle/{middle_id}/<some string>
ex:

/top/{top_id}/middle/{middle_id}/book

/top/{top_id}/middle/{middle_id}/pen

/top/{top_id}/middle/{middle_id}/dog

@Component
    public class Top{
    }

    @Component
    public class Middle{
    }