How to add an array to a MongoDB document using Java?

Question

I want to create the following document schema in mongoDB using the java driver

{
  "_id": {
    "$oid": "513e9820c5d0d8b93228d7e8"
  },
  "suitename": "testsuite_name",
  "testname": "testcase_name",
  "milestones": [
    {
      "milestone_id": "359",
      "testplans": [
        {
          "pland_id": "965",
          "runs": [
            6985,
            5896
          ]
        },
        {
          "plan_id": "984",
          "runs": [
            9856,
            3684
          ]
        }
      ]
    }
  ]
}

I have the following code

BasicDBObject testObject = new BasicDBObject();
BasicDBObject milestoneObject = new BasicDBObject();

testObject.put("suitename", testsuite);
testObject.put("testname", testcase);
testObject.put("milestones", new BasicDBObject("milestone_id", "2333"));
locations.insert(testObject);

But this is not generating milestone as an array. How can I add milestone as an array? I currently get this using my code

{
  "_id": {
    "$oid": "513f93dac5d0e2439d34308e"
  },
  "suitename": "test_deployment_disable_client.TestDeploymentDisableClient",
  "testname": "test_deployment_disable_client",
  "milestones": {
    "milestone_id": "2333"
  }
}

Answer 1

Change to something like this:

testObject.put("suitename", testsuite);
testObject.put("testname", testcase);         
List<BasicDBObject> milestones = new ArrayList<>();
milestones.add(new BasicDBObject("milestone_id", "2333"));
testObject.put("milestones", milestones);
locations.insert(testObject);