Estoy intentando almacenar un objeto en una base de datos MongoDB (usando MongoDB 3.0.2) y obtengo unCodecConfigurationException al intentar codificar el objeto con mensaje de error

Can't find a codec for class java.time.LocalDate. 

He escrito e incluido un códec para elLocalDate objetos. Los detalles siguen.

El objeto,DutyBlock, que estoy intentando almacenar tiene estas variables miembro:

public class DutyBlock {
    private LocalDate startDate;
    private LocalDate endDate; //Inclusive
    private int blockLength;
    private double pointValue;
    private ArrayList<Ra> assigned;
}

Escribí el siguiente códec para codificar elDutyBlock objetos dentro de la base de datos:

public class DutyBlockCodec implements Codec<DutyBlock> {

    @Override
    public void encode(BsonWriter writer, DutyBlock t, EncoderContext ec) {
        Document document = new Document();
        document.append("startDate", t.getStartDate());
        document.append("endDate", t.getEndDate());
        document.append("blockLength", t.getBlockLength());
        document.append("pointValue", t.getPointValue());
        document.append("assigned", t.getRasOnDuty());

        writer.writeString(document.toJson());  //Line 27 in the error message.
    }

    @Override
    public Class<DutyBlock> getEncoderClass() {
        return DutyBlock.class;
    }

    @Override
    public DutyBlock decode(BsonReader reader, DecoderContext dc) {
        String json = reader.readString();
        return new DutyBlock(Document.parse(json));
    }

}

Dado que MongoDB actualmente no es compatible con eljava.time.LocalDate class, He escrito el siguiente códec para codificar elLocalDate objetos dentro de la base de datos:

public class LocalDateCodec implements Codec<LocalDate> {

    @Override
    public void encode(BsonWriter writer, LocalDate t, EncoderContext ec) {
        writer.writeString(t.toString());
    }

    @Override
    public Class<LocalDate> getEncoderClass() {
        return LocalDate.class;
    }

    @Override
    public LocalDate decode(BsonReader reader, DecoderContext dc) {
        String date = reader.readString();
        return LocalDate.parse(date);
    }
}

He añadido los dosCodec's (junto con uno para elRa tipo) a laCodecRegistry en el nivel MongoClient mientras se crea una instancia del MongoClient.

public class DutyScheduleDB {
    private MongoClient mongoClient;
    private MongoDatabase db;

    public DutyScheduleDB() {
        CodecRegistry codecRegistry = 
                CodecRegistries.fromRegistries(
                        CodecRegistries.fromCodecs(new LocalDateCodec(), new DutyBlockCodec(), new RaCodec()),
                        MongoClient.getDefaultCodecRegistry());
        MongoClientOptions options = MongoClientOptions.builder()
                .codecRegistry(codecRegistry).build();
        mongoClient = new MongoClient(new ServerAddress(), options);
        db = mongoClient.getDatabase("DutySchedulerDB");
    }
    . (More code not shown)
    .
    .
}

Intento almacenar unArrayList deDutyBlock objetos como parte de unorg.bson.Document dentro de la base de datos MongoDB.

public void storeScheduledCalendar(String id,
        String calendarName,
        ArrayList<DutyBlock> cal) {
    //Access collection of scheduled calendars.
    MongoCollection collection = db.getCollection("ScheduledCalendars");
    //Query parameter is uuid + calendarName.
    Document doc = new Document("name", id + calendarName);
    doc.append("dutyBlocks", cal);
    //Insert doc to collection.
    collection.insertOne(doc); //Line 59 in the error message.
}

Sin embargo, me encuentro con este mensaje de error:

Exception in thread "main" org.bson.codecs.configuration.CodecConfigurationException: Can't find a codec for class java.time.LocalDate.
at org.bson.codecs.configuration.CodecCache.getOrThrow(CodecCache.java:46)
at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:63)
at org.bson.codecs.configuration.ProvidersCodecRegistry.get(ProvidersCodecRegistry.java:37)
at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:174)
at org.bson.codecs.DocumentCodec.writeMap(DocumentCodec.java:189)
at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:131)
at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:45)
at org.bson.Document.toJson(Document.java:294)
at org.bson.Document.toJson(Document.java:268)
at org.bson.Document.toJson(Document.java:255)
at SchedulingHeuristic.DutyBlockCodec.encode(DutyBlockCodec.java:27)
at SchedulingHeuristic.DutyBlockCodec.encode(DutyBlockCodec.java:16)
at org.bson.codecs.EncoderContext.encodeWithChildContext(EncoderContext.java:91)
at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:175)
at org.bson.codecs.DocumentCodec.writeIterable(DocumentCodec.java:197)
at org.bson.codecs.DocumentCodec.writeValue(DocumentCodec.java:170)
at org.bson.codecs.DocumentCodec.writeMap(DocumentCodec.java:189)
at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:131)
at org.bson.codecs.DocumentCodec.encode(DocumentCodec.java:45)
at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:63)
at org.bson.codecs.BsonDocumentWrapperCodec.encode(BsonDocumentWrapperCodec.java:29)
at com.mongodb.connection.InsertCommandMessage.writeTheWrites(InsertCommandMessage.java:99)
at com.mongodb.connection.InsertCommandMessage.writeTheWrites(InsertCommandMessage.java:43)
at com.mongodb.connection.BaseWriteCommandMessage.encodeMessageBody(BaseWriteCommandMessage.java:112)
at com.mongodb.connection.BaseWriteCommandMessage.encodeMessageBody(BaseWriteCommandMessage.java:35)
at com.mongodb.connection.RequestMessage.encode(RequestMessage.java:132)
at com.mongodb.connection.BaseWriteCommandMessage.encode(BaseWriteCommandMessage.java:89)
at com.mongodb.connection.WriteCommandProtocol.sendMessage(WriteCommandProtocol.java:170)
at com.mongodb.connection.WriteCommandProtocol.execute(WriteCommandProtocol.java:73)
at com.mongodb.connection.InsertCommandProtocol.execute(InsertCommandProtocol.java:66)
at com.mongodb.connection.InsertCommandProtocol.execute(InsertCommandProtocol.java:37)
at com.mongodb.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:155)
at com.mongodb.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:219)
at com.mongodb.connection.DefaultServerConnection.insertCommand(DefaultServerConnection.java:108)
at com.mongodb.operation.MixedBulkWriteOperation$Run$2.executeWriteCommandProtocol(MixedBulkWriteOperation.java:416)
at com.mongodb.operation.MixedBulkWriteOperation$Run$RunExecutor.execute(MixedBulkWriteOperation.java:604)
at com.mongodb.operation.MixedBulkWriteOperation$Run.execute(MixedBulkWriteOperation.java:363)
at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:148)
at com.mongodb.operation.MixedBulkWriteOperation$1.call(MixedBulkWriteOperation.java:141)
at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:186)
at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:177)
at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:141)
at com.mongodb.operation.MixedBulkWriteOperation.execute(MixedBulkWriteOperation.java:72)
at com.mongodb.Mongo.execute(Mongo.java:747)
at com.mongodb.Mongo$2.execute(Mongo.java:730)
at com.mongodb.MongoCollectionImpl.executeSingleWriteRequest(MongoCollectionImpl.java:482)
at com.mongodb.MongoCollectionImpl.insertOne(MongoCollectionImpl.java:277)
at DutyScheduleDB.storeScheduledCalendar(DutyScheduleDB.java:59)
at DutyScheduleDB.main(DutyScheduleDB.java:106)

Parece que mi códec paraLocalDate no se usa al intentar codificarDutyBlock objetos, aunque he verificado que la colección que estoy intentando almacenarorg.bson.Document en efecto contiene elLocalDateCodec a través de

System.out.println(collection.getCodecRegistry().get(LocalDate.class));

¿Alguien puede darnos una idea de por qué sucede esto?