javamongodbmongodb-java

How to query documents using "_id" field in Java mongodb driver?

I am trying to find documents in MongoDB by searching on "_id" key. My document looks like this-

{
  "_id" : ObjectId("4f693d40e4b04cde19f17205"),
  "hostname" : "hostnameGoesHere",
  "OSType" : "OSTypeGoesHere"
}

I am trying to search this document as- 

ObjectId id= new ObjectId("4f693d40e4b04cde19f17205");        
BasicDBObject obj = new BasicDBObject();        
obj.append("_id", id);        
BasicDBObject query = new BasicDBObject();        
query.putAll(query);

But I get below error- 

error: reference to putAll is ambiguous, both method putAll(Map) in BasicBSONObject and method putAll(BSONObject) in BasicBSONObject match
        query.putAll(query);

The append method of BasicDBObject supports (String Key, Value) and if I pass "_id" as String to this method, no documents are matched.

So my question is how do I pass "_id"?

Solution

  • Solved it by using query as- 

    query.putAll((BSONObject)query);