I want to below java code need to written in service API with jax-rs

package hellomongo;

import java.util.ArrayList;
import java.util.List;
 
import org.bson.Document;
import org.bson.types.ObjectId;

import com.mongodb.DB;
import com.mongodb.MongoClient;
import com.mongodb.client.MongoCollection;
import com.mongodb.client.MongoDatabase;
import com.mongodb.client.model.Filters;
import com.mongodb.client.model.Updates;


public class Update {

public static void main(String args[]) {

	MongoClient client = new MongoClient("localhost", 27017);
	MongoDatabase database = client.getDatabase("admin");
	MongoCollection<Document> collection = database
			.getCollection("command");

Object id =  new ObjectId("5b16371c425750918ebf1454");
Document newCmd = new Document("d", 4);
collection.updateOne(Filters.eq("_id", id), Updates.addToSet("cmd", newCmd));

}

}

package com.api.restful;



 import java.util.ArrayList;
 import java.util.List;

 import javax.swing.text.Document;
 import javax.ws.rs.GET;
 import javax.ws.rs.Path;
 import javax.ws.rs.Produces;
 import javax.ws.rs.core.MediaType;


 @Path("/command")


 public class InsertionAPi {

 @GET
 @Produces(MediaType.APPLICATION_JSON)
 public String sayHello(){
 MongoClient client = new MongoClient("localhost", 27017);
 MongoDatabase database = client.getDatabase("admin");
 MongoCollection<document> collection = database
 .getCollection("command");

 Object id = new ObjectId("5b16371c425750918ebf1454");
 Document newCmd = new Document("d", 4);
 collection.updateOne(Filters.eq("_id", id), Updates.addToSet("cmd", newCmd));

 return collection;


 }

 }