Spring multi mongodb configuration

MultiMongoConfig.groovy

@CompileStatic
@Configuration
class MongoDBConfig {

    @Value('${mongodb.uri.meta}')
    private String metaURI
    @Value('${mongodb.uri.sdk}')
    private String sdkURI

    private MongoMappingContext mongoMappingContext

    {
        mongoMappingContext = new MongoMappingContext()
        this.mongoMappingContext.setFieldNamingStrategy(new SnakeCaseFieldNamingStrategy())
    }

    @Primary
    @Bean(name = "advertiserMongoTemplate")
    MongoTemplate advertiserMongoTemplate() throws Exception {
        MongoDbFactory dbFactory = new SimpleMongoDbFactory(new MongoClientURI(this.metaURI))
        return new MongoTemplate(dbFactory, this.getMongoConverter(dbFactory, this.mongoMappingContext))
    }

    @Bean(name = "campaignMongoTemplate")
    MongoTemplate secondaryMongoTemplate() throws Exception {
        MongoDbFactory dbFactory = new SimpleMongoDbFactory(new MongoClientURI(this.sdkURI))
        return new MongoTemplate(dbFactory, this.getMongoConverter(dbFactory, this.mongoMappingContext))
    }

    @Bean(name = "publisherMongoTemplate")
    MongoTemplate publisherMongoTemplate() throws Exception {
        MongoDbFactory dbFactory = new SimpleMongoDbFactory(new MongoClientURI(this.sdkURI))
        return new MongoTemplate(dbFactory, this.getMongoConverter(dbFactory, this.mongoMappingContext))
    }

    private MongoConverter getMongoConverter(MongoDbFactory dbFactory, MongoMappingContext mappingContext) {
        DbRefResolver dbRefResolver = new DefaultDbRefResolver(dbFactory)
        MappingMongoConverter mongoConverter = new MappingMongoConverter(dbRefResolver, mappingContext)
        mongoConverter.setTypeMapper(new DefaultMongoTypeMapper(null))
        return mongoConverter
    }

    @Configuration
    @EnableMongoRepositories(basePackages = "com.huantt.advertiser", mongoTemplateRef = "advertiserMongoTemplate")
    class AdvertiserMongoConfig {
    }

    @Configuration
    @EnableMongoRepositories(basePackages = "com.huantt.campaign", mongoTemplateRef = "campaignMongoTemplate")
    class CampaignMongoConfig {
    }

    @Configuration
    @EnableMongoRepositories(basePackages = "com.huantt.publisher", mongoTemplateRef = "publisherMongoTemplate")
    class PublisherMongoConfig {
    }
}