Insert DBObject into MongoDB using Spring Data

I tried to insert the following DBObject into MongoDB using Spring Data:

    BasicDBObject document = new BasicDBObject();
    document.put("country", "us");
    document.put("city", "NY");
    mongoTemplate.insert(document);

where mongoTemplate is my Spring template (org.springframework.data.mongodb.core.MongoTemplate).

When executing, I get:

Caused by: org.springframework.dao.InvalidDataAccessApiUsageException: No Persitent Entity information found for the class com.mongodb.BasicDBObject
at org.springframework.data.mongodb.core.MongoTemplate.determineCollectionName(MongoTemplate.java:1747)
at org.springframework.data.mongodb.core.MongoTemplate.determineEntityCollectionName(MongoTemplate.java:1732)
at org.springframework.data.mongodb.core.MongoTemplate.insert(MongoTemplate.java:658)

My JSON would be dynamic at the end. So any idea how to provide these entity information dynamically ? Or is there another way to insert raw JSON into Mongodb through Spring Data ?