Mongo.java

/*------------------------------------------------------------------------------------------------*/
public interface AlbumRepository extends CrudRepository<Album, String>, AlbumRepositoryCustom {

}

/*------------------------------------------------------------------------------------------------*/

@Repository
public interface MongoAlbumRepository extends MongoRepository<Album, String>, AlbumRepository {

}

/*------------------------------------------------------------------------------------------------*/

@Configuration
@Profile("mongodb")
@EnableMongoRepositories(basePackageClasses = {MongoAlbumRepository.class})
public class MongoConfig {

    @Bean
    public MongoTemplate mongoTemplate(MongoDbFactory mongoDbFactory) {
        return new MongoTemplate(mongoDbFactory);
    }

}

/*------------------------------------------------------------------------------------------------*/

@Configuration
@Profile("mongodb-cloud")
public class MongoCloudConfig extends AbstractCloudConfig {

    @Bean
    public MongoDbFactory mongoDbFactory() {
        return connectionFactory().mongoDbFactory();
    }

}

/*------------------------------------------------------------------------------------------------*/

@Configuration
@Profile("mongodb-local")
public class MongoLocalConfig {

    @Bean
    public MongoDbFactory mongoDbFactory() {
        try {
            return new SimpleMongoDbFactory(new MongoClient(), "music");
        } catch (UnknownHostException e) {
            throw new RuntimeException("Error creating MongoDbFactory: " + e);
        }
    }

}

/*------------------------------------------------------------------------------------------------*/

public interface AlbumRepositoryCustom {

    List<Album> findByReleaseYearGreaterThan(String releaseYear);

}

/*------------------------------------------------------------------------------------------------*/

@Component
public class AlbumRepositoryImpl implements AlbumRepositoryCustom {

    private MongoOperations ops;


    @Autowired
    public AlbumRepositoryImpl(MongoOperations ops) {
        MongoTemplate mongoTemplate = null;
        Assert.notNull(ops, "MongoOperations must not be null!");
        this.ops = ops;

    }

    @Override
    public List<Album> findByReleaseYearGreaterThan(String releaseYear) {
        List<Album> l = new ArrayList<>();
        for (Album album : ops.findAll(Album.class)) {
            if (Integer.parseInt(album.getReleaseYear()) > Integer.parseInt(releaseYear)) {
                l.add(album);
            }
        }
        return l;
    }
}

/*------------------------------------------------------------------------------------------------*/

@Controller
@RequestMapping(value = "/albums")
public class MyAlbumController {

    private static final Logger logger = LoggerFactory.getLogger(MyAlbumController.class);
    private CustomMongoAlbumRepositoryImpl repository;

    @Autowired
    public AlbumController(AlbumRepository repository) {
        this.repository = repository;
    }

    @ResponseBody
    @RequestMapping(method = RequestMethod.GET, value = "/{releaseYear}", produces = MediaType.APPLICATION_JSON_VALUE)
    public List<Album> getById(@PathVariable String releaseYear) {
        logger.info("Getting album " + releaseYear);
        return repository.findByReleaseYearGreaterThan(releaseYear);
    }
}

I am new with Backend, it's my first and I have to build REST API Service for my Android app (with mongodb as database), which will use it as REST Cient via Retrofit, I chose Spring cause it uses Java and it's familiar with retrofit syntax. I followed the sample https://github.com/cloudfoundry-samples/spring-music but I got lost as many others with MongoTemplate and MongoRepository
http://stackoverflow.com/questions/17008947/spring-data-mongotemplate-vs-mongorepository/

Can you tell me how to extend AlbumRepository with my custom methods from AlbumCustomRepository to make MyAlbumController working cause simple extend doesn't work ?

I didn't change anything from this spring-music sample, I thought JavaConfig is better than XML but much more confusing and if you follow different samples you got stuck like me :)

I pushed it to http://spring-music-underplain-picocurie.cfapps.io/

Sorry man, it's working my Intellij/Tomcat was wrong configured.
Thanks for your help on stackoverflow answers, now I Will read the whole reference for queries to imporve it.

http://spring-music-underplain-picocurie.cfapps.io/albums/q?releaseYear=1990