Spring Data MongoDB Converter not getting registered - mongodb

Question

I have a setup of multiple MongoDB configuration. Here is the configuration class
#Configuration
#RequiredArgsConstructor
#EnableConfigurationProperties(MongoConfigProperties.class)
public class MultipleMongoConfig {
private static final Logger logger = LoggerFactory.getLogger(MultipleMongoConfig.class);
private final MongoConfigProperties mongoProperties;
#Primary
#Bean(name = "sysdiagMongoTemplate")
public MongoOperations sysdiagMongoTemplate() {
MappingMongoConverter mappingMongoConverter = new MappingMongoConverter(new DefaultDbRefResolver(sysdiagFactory(mongoProperties.getSysdiag())),
new MongoMappingContext());
List<Converter<?, ?>> converters = new ArrayList<>();
converters.add(new AggregationResultReadConverter());
mappingMongoConverter.setCustomConversions(new CustomConversions(CustomConversions.StoreConversions.NONE, converters));
mappingMongoConverter.afterPropertiesSet();
boolean canConvert = mappingMongoConverter.getConversionService().canConvert(Document.class, AggregationResult.class);
mappingMongoConverter.afterPropertiesSet();
logger.info("canConvertFromDocumentToAggResult:: " + canConvert); //gives TRUE
return new MongoTemplate(sysdiagFactory(this.mongoProperties.getSysdiag()), mappingMongoConverter);
}
#Bean(name = "monitoringMongoTemplate")
public MongoOperations monitoringMongoTemplate() {
return new MongoTemplate(monitoringFactory(this.mongoProperties.getMonitoring()));
}
public MongoDbFactory sysdiagFactory(final MongoProperties mongo) {
return new SimpleMongoDbFactory(new MongoClient(mongo.getHost(), mongo.getPort()),
mongo.getDatabase());
}
public MongoDbFactory monitoringFactory(final MongoProperties mongo) {
return new SimpleMongoDbFactory(new MongoClient(mongo.getHost(), mongo.getPort()),
mongo.getDatabase());
}
}
Here is the read converter class (I only require reading from MongoDB). We have dynamic keys in the document due to which I need to convert them into a Map
public class AggregationResultReadConverter implements Converter<Document, AggregationResult> {
#Override
public AggregationResult convert(Document source) {
AggregationResult aggregationResult = new AggregationResult();
aggregationResult.setData(new HashMap());
for(Map.Entry<String,Object> entry : source.entrySet()){
if(entry.getKey().matches("[A-Z][A-Z][A-Z]")){
aggregationResult.getData().put(entry.getKey(), entry.getValue());
}
}
return aggregationResult;
}
}
Here is the mapping configuration for one of the MongoDB database
#Configuration
#EnableMongoRepositories(basePackages = {"com.hns.services.restapi.db.mongo.sysdiag.entity", "com.hns.services.restapi.db.mongo.sysdiag.repo"}, mongoTemplateRef = "sysdiagMongoTemplate")
public class SysdiagMongoConfig {
}
And here is the repository interface
#Repository
public interface AggregationResultRepository extends MongoRepository<AggregationResult, ObjectId> {
#Query("{ TIME: {$gte : ?0, $lt: ?1}}")
List<AggregationResult> findInTimeRange(Long startTime, Long endTime);
}
When I query using AggregationResultRepository, I expect the converter code to be executed so that I can convert the fields and put them in the Entity (Document) class object as per the logic. The query is going fine as I saw in the debug logs and I see an output but the converter is not getting called.
The converted is getting registered with the mongo template as the canConvertFromDocumentToAggResult logger gives TRUE. I tried changing the converted from Document -> AggregationResult to DBObject -> AggregationResult but no luck. Not sure what am I missing here.