Inserting Java Object to MongoDB Collection Using Java

Question

I am trying to insert a whole Java object into a MongoDB Collection using Java. I am getting following error:

Error :

Exception in t         


        

Answer 1

There have been several changes since this question was asked. Using test.java in the question, here is what worked for me using Google's Gson:

import com.google.gson.Gson;
import com.mongodb.Block;
import com.mongodb.MongoClient;
import com.mongodb.client.FindIterable;
import com.mongodb.client.MongoDatabase;
import org.bson.Document;

public class test {
  public static void main(String[] args) {
    MongoClient mongoClient = new MongoClient(); // Connect with default settings i.e. localhost:27017
    MongoDatabase db = mongoClient.getDatabase("test"); // Get database "test". Creates one if it doesn't exist
    Employee employee = new Employee(); // Create java object
    employee.setNo(1L);
    employee.setName("yogesh");
    // Deserialize object to json string
    Gson gson = new Gson();
    String json = gson.toJson(employee);
    // Parse to bson document and insert
    Document doc = Document.parse(json);
    db.getCollection("NameColl").insertOne(doc);

    // Retrieve to ensure object was inserted
    FindIterable iterable = db.getCollection("NameColl").find();
    iterable.forEach(new Block() {
      @Override
      public void apply(final Document document) {
        System.out.println(document); // See below to convert document back to Employee
      }
    });

  }
}

You can also use Gson to convert retrieved bson document back to Java object:

Gson gson = new Gson();
Employee emp = gson.fromJson(document.toJson(), Employee.class);