Mongodb $lookup in Spring data mongo

Question

I\'m a new Mongodb and I have a problem with $lookup with java spring.

I would like to use this shell in Spring data

db.NewFeed.aggregate([
    {
           


        

Answer 1

Joining Two Collections with Spring Data MongoDB

Employee Class

class Employee {
    private String _id;
    private String name;
    private String dept_id;
}

Department Class

class Department {
    private String _id;
    private String dept_name;
}

Employee Result Class

public class EmpDeptResult {

    private String _id;
    private String name;
    private List