I have a
MongoCollection<Document> in which I assign a collection.
I’m trying to find a user by his id.
user = (Document) usersCollection.find(new Document("_id", username));
with that I’m getting an error
java.lang.ClassCastException: com.mongodb.FindIterableImpl cannot be cast to org.bson.Document
When I try
BasicDBObject query = new BasicDBObject(); BasicDBObject fields = new BasicDBObject("_id", username); usersCollection.find(query, fields);
I’m getting an error
The method find(Bson, Class) in the type MongoCollection is not applicable for the arguments (BasicDBObject, BasicDBObject)
Try to create a filter to pass to the
find() method to get a subset of the documents in your collection. For example, to find the document for which the value of the
_id field is
test, you would do the following:
import static com.mongodb.client.model.Filters.*; MongoClient client = new MongoClient(); MongoDatabase database = client.getDatabase("mydb"); MongoCollection<Document> collection = database.getCollection("mycoll"); Document myDoc = collection.find(eq("_id", "test")).first(); System.out.println(myDoc.toJson());