how to write condition for when I send same movie name in postman i will not accept for same movienames

This is movie class

. I have code for add the movie in postman using post request.

public class Movie {


    private int id;
    private String movieName;
    private String description;
    private String hero;
    private String heroine;

    public Movie(){

    }

    public Movie(int id, String movieName, String description, String hero, String heroine) {
        this.id = id;
        this.movieName = movieName;
        this.description = description;
        this.hero = hero;
        this.heroine = heroine;

    }
//here have setter and getter methods

This is controller class.now what the logic for not accept duplicate moviename

public class MovieController extends Controller {

    public static List<Movie> movies;

    static {
        movies = new ArrayList<>();
        movies.add(new Movie(1, "Fprd vs Ferrari", "Movie on Racing", "abcd", "xyz"));
        movies.add(new Movie(2, "F2", "Comedy Movie", "Venkatesh", "Tamanna"));
        movies.add(new Movie(3, "Titanic", "Movie", "Hero", "Heroine"));
        movies.add(new Movie(4, "Saaho", "action", "Prabhas", "Shradda kapoor"));
        movies.add(new Movie(5, "Bhahubali 1", "action", "Prabhas", "Tamanna"));

    }
 public Result insert(Http.Request request) {
        JsonNode jsonNode = request.body().asJson();
        if (jsonNode == null) {
            return badRequest("insufficient movie information");
        }
        Movie movie = Json.fromJson(jsonNode, Movie.class);
        movies.add(movie);
        return ok(Json.toJson(movie));
    }

This is the Routing for post request

POST        /newmovies              controllers.MovieController.insert(request: Request)

You can do something like this:

Movie movie = Json.fromJson(jsonNode, Movie.class);

if(movies.stream().noneMatch(m -> m.getMovieName().equals(movie.getName()))) {
    movies.add(movie);
    return ok(Json.toJson(movie));
} else {
    // Movie name already exists... Throw exception here
    return badRequest("Movie already exists");
}