Morphia & entity always return size = zero/[ ]

[NOTiFYcouk]

final Datastore datastore = Morphia.createDatastore(MongoClients.create(), "goStopHandleDB");
LOGGER.info(">>>>> 1 0.059 ManufacturerEJB datastore = {}", datastore.getDatabase().getName());

Query<Manufacturer> query = datastore.find(Manufacturer.class);
LOGGER.info(">>>>> 2 ManufacturerEJB query = {}", query.filter());

List<Manufacturer> manufacturerList = query.iterator().toList();
LOGGER.info(">>>>> 3 ManufacturerEJB manufacturerList = {}", manufacturerList.size());
LOGGER.info(">>>>> 4 ManufacturerEJB manufacturerList = {}", manufacturerList.toArray());

Always displays Zero/[]:

14:44:06,510 INFO  [org.mongodb.driver.connection] (cluster-ClusterId{value='62b31ca6ac209e59e501c5bf', description='null'}-localhost:27017) Opened connection [connectionId{localValue:2, serverValue:633}] to localhost:27017
14:44:06,510 INFO  [org.mongodb.driver.connection] (cluster-rtt-ClusterId{value='62b31ca6ac209e59e501c5bf', description='null'}-localhost:27017) Opened connection [connectionId{localValue:1, serverValue:632}] to localhost:27017
14:44:06,510 INFO  [org.mongodb.driver.cluster] (cluster-ClusterId{value='62b31ca6ac209e59e501c5bf', description='null'}-localhost:27017) Monitor thread successfully connected to server with description ServerDescription{address=localhost:27017, type=STANDALONE, state=CONNECTED, ok=true, minWireVersion=0, maxWireVersion=13, maxDocumentSize=16777216, logicalSessionTimeoutMinutes=30, roundTripTimeNanos=20872090}
14:44:06,514 INFO  [com.gostophandle.ejb.ManufacturerEJB] (ServerService Thread Pool -- 95) >>>>> 1 0.059 ManufacturerEJB datastore = goStopHandleDB
14:44:06,542 INFO  [com.gostophandle.ejb.ManufacturerEJB] (ServerService Thread Pool -- 95) >>>>> 2 ManufacturerEJB query = MorphiaQuery[clazz=Manufacturer, query=Document{{_t=Document{{$in=[Manufacturer]}}}}]
14:44:06,588 INFO  [org.mongodb.driver.connection] (ServerService Thread Pool -- 95) Opened connection [connectionId{localValue:3, serverValue:634}] to localhost:27017
14:44:06,602 INFO  [com.gostophandle.ejb.ManufacturerEJB] (ServerService Thread Pool -- 95) >>>>> 3 ManufacturerEJB manufacturerList = 0
14:44:06,602 INFO  [com.gostophandle.ejb.ManufacturerEJB] (ServerService Thread Pool -- 95) >>>>> 4 ManufacturerEJB manufacturerList = {}

MongoDB is:

etc ...
{
    "_id" : ObjectId("627b8b9589034bb0c0d3c258"),
    "manufacturer" : "Moto Guzzi",
    "country" : "ITA",
    "yearEstablished" : ISODate("1921-01-01T00:00:00.000+0000")
}
{
    "_id" : ObjectId("627b8b9589034bb0c0d3c259"),
    "manufacturer" : "Moto Morini",
    "country" : "ITA",
    "yearEstablished" : ISODate("1900-01-01T00:00:00.000+0000")
}
{
    "_id" : ObjectId("627b8b9589034bb0c0d3c25a"),
    "manufacturer" : "MV Agusta",
    "country" : "ITA",
    "yearEstablished" : ISODate("1900-01-01T00:00:00.000+0000")
}

Entity:

@Entity("manufacturers")
@Indexes(@Index(options = @IndexOptions(name = "manufacturers")))
public class Manufacturer {
    // implements Serializable
    private static final long serialVersionUID = 1L;
    @Id
    private ObjectId id;
    private String manufacturer;
    private String country;
    private Date yearEstablished;

    Manufacturer() {
    }

    /**
     * @param manufacturer    String
     * @param country         String
     * @param yearEstablished Date
     */
    public Manufacturer(String manufacturer, String country, Date yearEstablished) {
        this.manufacturer = manufacturer;
        this.country = country;
        this.yearEstablished = yearEstablished;
    }

    public String getManufacturer() {
        return manufacturer;
    }

    public void setManufacturer(String manufacturer) {
        this.manufacturer = manufacturer;
    }

    public String getCountry() {
        return country;
    }

    public void setCountry(String country) {
        this.country = country;
    }

    public Date getYearEstablished() {
        return yearEstablished;
    }

    public void setYearEstablished(Date yearEstablished) {
        this.yearEstablished = yearEstablished;
    }

   etc:
}

Was okay with ORM/OGN. Can't see what I've not done? TIA.

morphia-core-2.3.0-SNAPSHOT
MongoDB 5.0.7 with mongodb-driver-core-4.5.0 & classgraph-4.8.147

[evanchooly]

Your entity is configured to use discriminators (that's the default) so you need to disable that. You can change that by updating your @Entity annotation to disable discriminators.

[NOTiFYcouk]

Thanks - Perfect now.

@Entity(value = "manufacturers", useDiscriminator = false)
@Indexes(@Index(options = @IndexOptions(name = "manufacturers")))
public class Manufacturer {

18:40:41,901 INFO  [com.gostophandle.ejb.ManufacturerEJB] (ServerService Thread Pool -- 92) >>>>> 3 ManufacturerEJB manufacturerList = 39
18:40:41,905 INFO  [com.gostophandle.ejb.ManufacturerEJB] (ServerService Thread Pool -- 92) >>>>> 4 ManufacturerEJB manufacturerList = Manufacturer{id='627b8b9589034bb0c0d3c23d', manufacturer='AJS', country='GB', yearEstablished=Fri Jan 01 00:00:00 GMT

[NOTiFYcouk]

FYI - Works fine with these JARs:

morphia-core-2.3.0-SNAPSHOT
morphia-core-2.2.7
classgraph-4.8.147

Versions MongoDB: 4.5.0, 4.6.0 & 4.6.1

mongodb-driver-core-4.6.1
bson-4.6.1
mongodb-driver-sync-4.6.1