Cal30

query {
   root_field {
      field
      field {
         field
      }
      ...
   }
}

Cal30

return newObject()
          .name("Query")
          .description("Root query")
          .field(newFieldDefinition()
                     .name("film")
                     .description("Find a film by id")
                     .argument(newArgument() // argumento (id: ID)
                                 .name("id")
                                 .description("Film ID")
                                 .type(new GraphQLNonNull(GraphQLInt)))

Cal30

@Override
public Object get(DataFetchingEnvironment environment) {

    if (environment.getSource() != null) {
        Map source = (Map) environment.getSource();
        if (connection) {
            return resolveConnection(source, environment);
        } else {
            return resolveEntity(source);
        }

Cal30

@Override
public Object get(DataFetchingEnvironment environment) {
    List<Object> list = new ArrayList<>();
    Map page = (Map) restService.restRequest(getURI(), true);

    while (page != null){

        List results = (List) page.get("results");
        String next = (String) page.get("next");

Cal30

@Override
    public Object get(DataFetchingEnvironment environment) {
        // Extract 'id' argument from the GraphQL execution environment
        if (environment.getArgument("id") != null){
            return restService.restRequest(getURI()
                                           .concat(environment.getArgument("id").toString())
                                           .concat("/"), true);
        }
        return null;
    }

Cal30

.field(newFieldDefinition()
             .name("people")
             .description("Find a character by id")
             .argument(newArgument() // argumento (id: ID)
                         .name("id")
                         .description("People ID")
                         .type(new GraphQLNonNull(GraphQLInt)))
             .type(new GraphQLTypeReference("People"))
             .dataFetcher(peopleDataFetcher))

Cal30

.field(newFieldDefinition()
           .name("homeworld")
           .description("Planet where character took birth")
           .type(new GraphQLTypeReference("Planet")) 
           .dataFetcher(homeworldEmbeddedDataFetcher) 
           .build())

Cal30

return newObject()
            .name("Film")
            .description("Film - Represents an SW film")
            .field(newFieldDefinition()
                       .name("director")
                       .description("Director of the film")
                       .type(Scalars.GraphQLString)
                       .build())