Spring not using my custom converter

[truetime]

I have a workable version for converter registion:

	<mongo:mapping-converter >
		<mongo:custom-converters>
			<mongo:converter>
				<bean class="com.abc.Converter.mongo.DBObjectToDateTime" />
			</mongo:converter>
			<mongo:converter>
				<bean class="com.abc.Converter.mongo.DateTimeToDBObject" />
			</mongo:converter>
		</mongo:custom-converters>
	</mongo:mapping-converter>

	<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
		<constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
		<constructor-arg name="mongoConverter" ref="mappingConverter" />
	</bean>

but if I am trying scanning style for converter registration, it doesn't work until now:

	<mongo:mapping-converter base-package="com.abc.*.entities">
		<mongo:custom-converters base-package="com.abc.Converter.mongo" />
	</mongo:mapping-converter>

	<bean id="mongoTemplate" class="org.springframework.data.mongodb.core.MongoTemplate">
		<constructor-arg name="mongoDbFactory" ref="mongoDbFactory" />
		<constructor-arg name="mongoConverter" ref="mappingConverter" />
	</bean>

where com.abc.*.entities is the place for domain class, and the package com.abc.Converter.mongo is the place for converters like DateTimeToDBObject and DBObjectToDateTime.
anything I missed here?

[truetime]

for example, if we want mongodb only store the id of some part of entities, the converter seems like:

public final class DBObjectToEntityFactory implements ConverterFactory<DBObject, BaseEntity> {
	
	public <T extends BaseEntity> Converter<DBObject, T> getConverter(Class<T> targetType) {
		return new DBObjectToManagedEntityConverter<T>();
	}

	private final class DBObjectToManagedEntityConverter<T extends BaseEntity> implements Converter<DBObject, T> {
		@Autowired CrudRepository<T, Long> repo;

		public T convert(DBObject source){
			return (T) repo.findOne((Long) source.get("id"));
		}
	}

}

public class EntityToDBObject implements Converter<BaseEntity, DBObject> {

	public DBObject convert(BaseEntity source) {
		DBObject dbo = new BasicDBObject();
		dbo.put("id", source.getId());
		return dbo;
	}

}