working server

        this.objectCollection = database.getCollection("objectSets");

    }

    public Map<String, ObjectSet> retrieveAllObjectSets() {

        Map<String, ObjectSet> allObjectSets = new HashMap<>();

        MongoCursor<Document> cursor = objectCollection.find().iterator();

        try {

            while (cursor.hasNext()) {

                Document doc = cursor.next();

                Integer index = doc.getInteger("index");

                if (index != null) {

                    allObjectSets.put(index.toString(), convertDocumentToObjectSet(doc));

                }

            }

        } finally {

            cursor.close();

        }

        return allObjectSets;

    }

    /**

     * calls convertDocumentToObjectSet

     * @return

     */

    public ObjectSet retrieveLatestObjectSet() {

        Document doc = objectCollection.find().sort(new Document("index", -1)).first();

        return doc != null ? convertDocumentToObjectSet(doc) : null;

        for (Document pointSetDoc : pointSetsDocs) {

            objectSet.objects.add(convertDocumentToPointSet(pointSetDoc));

        }

        return objectSet;

    }

        objectCollection.replaceOne(Filters.eq("index", index), doc, options);

    }

    public ObjectSet retrieveObjectSet(int index) {

        Document query = new Document("index", index);

        Document doc = objectCollection.find(query).first();

        if (doc != null) {

            return convertDocumentToObjectSet(doc);

        }

        return null;

    }

}

import object_detection.ObjectDetector;

import object_detection.types.ObjectSet;

import object_detection.types.Point;

import object_detection.types.PointSet;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.context.annotation.Configuration;

        @GetMapping("/getObjects")

        public ResponseEntity<String> getObjects() {

            try {

                Map<String, ObjectSet> allObjectSets = dbInteraction.retrieveAllObjectSets();

                if (!allObjectSets.isEmpty()) {

                    return ResponseEntity.ok(gson.toJson(allObjectSets));

                ObjectSet objectSet = dbInteraction.retrieveLatestObjectSet();

                List<String> indexes = new ArrayList<>();

                for(PointSet p : objectSet.objects){

                    indexes.add(Integer.toString(p.getIDX()));

                }

                Map<String, List<String>> result = new HashMap<>();

                result.put("objects", indexes);

                if (!indexes.isEmpty()) {

                    return ResponseEntity.ok(gson.toJson(result));

                } else {

                    return ResponseEntity.notFound().build();

                }

        public ResponseEntity<String> tempJson() {

            try {

                ObjectSet latestObjectSet = dbInteraction.retrieveLatestObjectSet();

                if (latestObjectSet != null) {

                    return ResponseEntity.ok(gson.toJson(latestObjectSet.objects));

                Map<String, PointSet> result = new HashMap<>();

                for(PointSet p : latestObjectSet.objects){

                    result.put(Integer.toString(p.getIDX()), p);

                }

                if (!result.isEmpty()) {

                    return ResponseEntity.ok(gson.toJson(result));

                } else {

                    return ResponseEntity.notFound().build();

                }

server.port = 5555

#spring.data.mongodb.uri = mongodb+srv://zanem:<YXQiSFkSVqxPTs3M>@cluster0.axhv9kg.mongodb.net/?retryWrites=true&w=majority&appName=Cluster0

 No newline at end of file

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