MongoDB Cross Store - Refer a collection of documents in JPA Entity Bean?

[jasonhan]

I've found that the annotation @RelatedDocument can only backing a plain object to the MongoDB document. It I declare it before a List field, for example:
@Entity
class Club {
@RelatedDocument
private List<Person> members;
....
}

@Document
class Person {
...
}

The ClassCastException will throw at runtime:
java.lang.ClassCastException: com.mongodb.BasicDBObject cannot be cast to com.mongodb.BasicDBList
at org.springframework.data.mongodb.core.convert.Mapp ingMongoConverter.writeInternal(MappingMongoConver ter.java:346)
at org.springframework.data.mongodb.core.convert.Mapp ingMongoConverter.write(MappingMongoConverter.java :316)

How can I deal with this problem? Thanks.

[jasonhan]

In Spring Data's MongoDB core mapping package, there is a @DBRef annotation which can embed a collection in a document. So, does cross store provide the similar capacity?