How to set UuidRepresentation to Standard with Java driver?

[Alexander Bagerman]

Hi,

I am starting a new project and would my UUIDs to get saved in UuidRepresentation.Standard representation rather as default UuidRepresentation.JAVA_LEGACY. I saw that C# driver allows you to submit it as a part of URI string (in options) but not the Java driver. 

What is the proper way of doing it?

Regards,

Alex

[Jeff Yemin]

This is only supported starting with the 3.0 Java driver (now in beta).  It's not supported as part of the URI; it's configurable only in code or equivalent configuration (Spring, Guice, etc):

import static org.bson.codecs.configuration.CodecRegistryHelper.fromCodec;
import static org.bson.codecs.configuration.CodecRegistryHelper.fromRegistries;

...

MongoClientOptions.Builder builder = MongoClientOptions.builder();
builder.codecRegistry(fromRegistries(fromCodec(new UuidCodec(UuidRepresentation.STANDARD)),
                                     MongoClient.getDefaultCodecRegistry()));
MongoClientOptions options = builder.build();

Regards,

Jeff

[Alexander Bagerman]

Jeff,

Thanks, I tried that and can see org.bson.codecs.configuration.CompoundCodecRegistry  with "firstCodecRegistry" set to SingleCodecRegistry with expected UuidCodec. 

Unfortunately even though execution goes through CompoundCodecRegistry constructor "public <T> Codec<T> get(final Class<T> clazz)" never gets called :-(. As a result added codec is never used.

I am using the following version of the driver:

<groupId>org.mongodb</groupId>

<artifactId>mongo-java-driver</artifactId>

<version>3.0.0-beta3</version>

And use this code to configure MongoClient:

ServerAddress serverAddress = new ServerAddress(getMongoHost(), getMongoPortNumber());

MongoCredential mongoCredential = MongoCredential.createMongoCRCredential(getMongoUser(), getDatabaseName(),

getMongoPassword().toCharArray());

MongoClientOptions.Builder builder = MongoClientOptions.builder();

builder.codecRegistry(fromRegistries(fromCodec(new UuidCodec(UuidRepresentation.STANDARD)),

                                    MongoClient.getDefaultCodecRegistry()));

MongoClientOptions options = builder.build();

MongoClient client = new MongoClient(serverAddress, Arrays.asList(mongoCredential), options);

Any ideas would be appreciated

Alex 

[Jeff Yemin]

Hi Alexander,

Thank you. You found a significant bug, which I filed as https://jira.mongodb.org/browse/JAVA-1675.  I have a fix in code review at https://github.com/jyemin/mongo-java-driver/tree/j1675.  Using that branch, this now works as you would expect:

MongoClientOptions.Builder builder = MongoClientOptions.builder();
CodecRegistry codecRegistry = fromRegistries(fromCodec(new UuidCodec(UuidRepresentation.STANDARD)),
                                             MongoClient.getDefaultCodecRegistry());

builder.codecRegistry(codecRegistry);
MongoClientOptions options = builder.build();
MongoClient client = new MongoClient(new ServerAddress(), options);

client.getDatabase("test").getCollection("test").insertOne(new Document("_id", UUID.randomUUID()));

Note that when using the legacy API the codec registry is ignored, so this will not use the overridden UUIDCodec:

     client.getDB("test").getCollection("test").insert(new BasicDBObject("_id", UUID.randomUUID()));

It was a deliberate decision to leave the legacy API's behavior as is, as the DBEncoder/DBDecoder behavior on DBCollection is complicated enough as it is.

Thanks again, and regards,

Jeff

[Alexander Bagerman]

Jeff,

Is there an analog of BasicDBList that I should start using as well? Some of my UUIDs are buried in arrays of document so i currently have something like this:

BasicDBList l = new BasicDBList();

l.add(new BasicDBObject().append("code": UUID.randomUUID()));

collection.insert(new BasicDBObject().append("list": l))

BTW, how can I add more codec at the same time as setting up my UUID one?

Thanks,

Alex

[Jeff Yemin]

You can use ArrayList instead.

Can you give me an example of other codecs that you want to add?  Do none of the other methods in CodecRegistryHelper suit your needs?

[Alexander Bagerman]

I am migrating data from JDBC source and would like just pass Date onto the mongo which fails as it can not find java.sql.Date codec. So, I do conversation to java.util.Date every time append it to by BasicDBObject (that I am going to convert to Document)

[Jeff Yemin]

OK, I pushed up some changes that should help you.  Check out this gist for what it should look like.

Let me know if it works for you.

Regards,

Jeff

[Alexander Bagerman]

Thanks, worked perfectly!