NoSuchElementException on Stream iterating List<Object>

hi!
Try to use this stream, but i got NoSuchElementException on

var scores = findAllByBarcode
                .stream()
                .iterator()
                .next()
                        .getMpProductFeedbacks()
                                .stream()
                                        .filter(mpProductFeedback -> mpProductFeedback.getId()==mpProductFeedbackId)
                                               .iterator()
                .next()
                .getMpPersonScores()
                .stream()
                .map(mpPersonScore -> {
                            var score = new ScoreType();
                            score.setUserScore(mpPersonScore.getMpPersonScore());
                            score.setUser(mpPersonScore.getMpPersonLogin());
                            score.setUserComment(mpPersonScore.getMpPersonComment());
                            return score;
                })
    .toList();

got exception after part

filter(mpProductFeedback -> mpProductFeedback.getId()==mpProductFeedbackId)
                                           .iterator()
            .next()

tried to use orElse, but it works only with .equals
i already have == between two longs.

>Solution :

Assuming we’re dealing with nested Collections

List<ScoreType> scores = findAllByBarcode
    .stream()
    .map( b -> b.getMpProductFeedbacks() )
    .flatMap( Collection::stream )
    .filter( feedback -> feedback.getId() == mpProductFeedbackId )
    .map( feedback -> feedBack.getMpPersonScores() )
    .flatMap( Collection::stream )
    .map( personScore -> {
        ScoreType score = new ScoreType();
        score.setUserScore( personScore.getMpPersonScore() );
        score.setUser( personScore.getMpPersonLogin() );         
        score.setUserComment( personScore.getMpPersonComment() );
        return score;
    })
   .toList();