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

DB db = mongoClient.getDB( "mydb" );

coll = db.getCollection("testCollection");

Employee emp = new Employee();
emp.setId("1001");
emp.setName("John Doe");

//Converting a custom Class(Employee) to BasicDBObject
Gson gson = new Gson();
BasicDBObject obj = (BasicDBObject)JSON.parse(gson.toJson(emp));
coll.insert(obj);
findEmployee(new BasicDBObject("id","1001"));


public static void findEmployee(BasicDBObject query){

    DBCursor cursor = coll.find(query);

    try {
       while(cursor.hasNext()) {
          DBObject dbobj = cursor.next();
        //Converting BasicDBObject to a custom Class(Employee)
          Employee emp = (new Gson()).fromJson(dbobj.toString(), Employee.class);
          System.out.println(emp.getName());
       }
    } finally {
       cursor.close();
    }

}

I thought that it would be useful to post code that did conversions both ways.
Storing an Employee Object
Finding and re-creating an employee Object
Hope this is useful..