For a college project i have to save a hashmap of Lists to a binary file. Then i have to be able to load it again but im having a bit of trouble. It will save my file but will not load it. Here is my code:

This is Saving:

private static void storeRec() 
{


    try
    {
        File f = new File("recommendation.dat");
        if(!f.exists())
        {
            f.createNewFile();
        }   
        FileOutputStream fos=new FileOutputStream(f);
        ObjectOutputStream oos=new ObjectOutputStream(fos);

        oos.writeObject(localStore);
        oos.flush();
        oos.close();
        fos.close();
        System.out.println("Recommendation read to File");


    } 
    catch (IOException ex) 
    {
        Logger.getLogger(Project2.class.getName()).log(Level.SEVERE, null, ex);
    }



}

This is the loading code :

 List<Recommendation> newmovies = new ArrayList<>();

    try
    {
        File f = new File("recommendation.dat");
        if(f.exists())
        {
            DataInputStream dis = new DataInputStream(new FileInputStream(f));
            /*FileInputStream streamIn = new FileInputStream(f);
            ObjectInputStream dis = new ObjectInputStream(streamIn);*/
            while(dis.available()>0)
            {
                byte[] titleBytes = new byte[32];
                dis.read(titleBytes);
                String title = new String(titleBytes);
                byte[] queryBytes = new byte[32];
                dis.read(queryBytes);
                String query = new String(queryBytes);
                byte[] directorBytes = new byte[32];
                dis.read(directorBytes);
                String director = new String(directorBytes);
                byte[] summaryBytes = new byte[64];
                dis.read(summaryBytes);
                String summary = new String(summaryBytes);

                byte[] categoryBytes = new byte[18];
                dis.read(categoryBytes);
                String category = new String(categoryBytes);  
               //String category = dis.readUTF();
                double rating = dis.readDouble();
                int release = dis.readInt(); 
                byte[] castBytes = new byte[64];
                dis.read(castBytes);
                String cast= new String(castBytes);
                ArrayList<String> castArrayList = new ArrayList<>(Arrays.asList(cast.split(",")));
                int myRating = dis.readInt();
                byte[] commentsBytes = new byte[32];
                dis.read(commentsBytes);
                String myComments = new String(commentsBytes);

                newmovies.add(new Recommendation(title,query,director,summary,release,category,rating,castArrayList,myRating,myComments));
                //System.out.println(newmovies);
                localStore.put(query, newmovies);

            }
        }

LocalStore is a hashmap i would like to add the data from the file to. The key is the Query. For some reason it will not add to the map

Any help would be very much appreciated.