Mongo Async Java driver doesnt return the id in insertOne method

[sandeepsahoo2k2]

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I am struggling to fix this problem where I have to get the inserted _id field for the mongodb async insertOne function. Can some one help or I have to get rid of the Async driver completely as there is no way ? following this tutoraial http://mongodb.github.io/mongo-java-driver/3.0/driver-async/getting-started/quick-tour/ .. Note : The document is successfully inserted to mongodb with the below call but there is no way that I can get the _id from this api. m_messages_collection.insertOne(userMessage, new SingleResultCallback<Void>() { @Override public void onResult(final Void result, final Throwable t) { logger.log(Level.INFO, "A new message from inserted to DB"); //Here result is also null even though the data is inserted // so there is no way that I can fetch the inserted _id } });

[Jeff Yemin]

The driver writes the _id into the document before it inserts it.  So something like this will work:

final Document userMessage = new Document();
// add fields to userMessage

collection.insertOne(userMessage, new SingleResultCallback<Void>() {
    @Override
    public void onResult(final Void result, final Throwable t) {

       // The _id value will be available in userMessage itself 

       System.out.println(userMessage.get("_id"));
    }
});

Let me know if that works for you.

Regards,

Jeff