anchor.diff:  }
   ----
   
  +NOTE: For readability we use classes with public fields, but classes with private fields with public getters and setters will also work.
  +
   The classes we have just created describe the GraphQL schema which is a
   set of possible data (objects, fields, relationships) that a client can access.
   
  
positive.code: 
      public List<Hero> getHeroesBySurname(String surname) {
          return heroes.stream()
                  .filter(hero -> hero.getSurname().equals(surname))
                  .collect(Collectors.toList());
      }
  }
  
negative.code: ----
      @Query
      @Description("Get a Films from a galaxy far far away")
      public Uni<Film> getFilm(int filmId) {
          // ...
      }
  ----
  