MongoDB Java driver find() returns exploded ObjectId?

[José Coelho]

I'm just doing CRUD on a mongo database with Java.
My problem is when I query the database

db.getCollection("something").find()

I get the documents correctly, but the ObjectId of each document is something like this:

"_id": {
      "timestamp": 1459641911,
      "machineIdentifier": 16375804,
      "processIdentifier": 3908,
      "counter": 9920756,
      "time": 1459641911000,
      "date": "2016-04-03T00:05:11.000+0000",
      "timeSecond": 1459641911
    }

I need to get the 12-byte ObjectId, like this:

ObjectId("507f1f77bcf86cd799439011")

How do I do that?

Thank you

[Ross Lawley]

Hi José,

Can you provide a little more information.  

* What version of the Java driver are you using? 

* Was it the Java driver that created the ObjectId?

* How are you viewing that ObjectId? (printing it to stdout?)

Cheers,

Ross 

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[José Coelho]

I'm using mongodb-driver 3.2.2 and I'm implementing a RESTful API with jax-rs.

If I go on mongodb shell and query I get the 12-byte representation, it's only when I output it directly to a Response.entity() that it explodes the ObjectId...

[Ross Lawley]

Hi,

Ah ok, it sounds as if the serialization in jax-rs is reflecting the internal values from the ObjectId.  Its not a stack I've personal experience of but I think if you create a custom serializer for ObjectId's it will fix the issue for you.  If you are using Jackson with jax-rs then an example can be found here: https://simplapi.wordpress.com/2013/06/18/handling-mongodb-objectid-threw-jerseyjackson/

All the best,

Ross

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