I'm using Jongo with Play framework 2, java. I added some data into my MongoDB.

{"_id" : ObjectId("538dafffbf6b562617252178"), ... }

However, when I fetched the ObjectId from the database, it gave me like:

de.undercouch.bson4jackson.types.ObjectId@484431ff instead of 538dafffbf6b562617252178. I don't quite understand how can I get the ObjectId value. My class is defined as following:

public class Product {
    @JsonProperty("_id")
    protected String id;
    ...
    public Product() {
    }

    public String getId() {
        return id;
    }

    public void setId(String id) {
        this.id = id;
    }
}

EDIT

In order to fetch the data, I simply use find() function provided by Jongo as following:

public static Iterable<Product> findAll(){
    return products().find().as(Product.class);
}