Nullpointer Exception in List while on filtering - Java

Question

Hi i am writing code for filtering specific data based on the input. if input not available in database it throwing nullpointer exception on the list since i am new in java i dont know how to solve this error

private String isCreditRatingValid(String isin) {

        System.out.println(isin);
        List<Credit_rating_details> result = Credit.stream()
                                            .filter(i-> i.getIssuer_id()
                          .contains(isin)).collect(Collectors.toList()); \\throwing NullPointerException on this line\\ 
        if(!result.isEmpty() ) {
            validCreditRating = result.get(0).getCredit_rating();
            return result.get(0).getCredit_rating();
        }else {
            return null;
        }

@NicholasK i am declaring credit 'static ArrayList<Credit_rating_details> Credit = null;' — Ashok
– Ashok, Commented Nov 3, 2018 at 7:36
If this static list Credit is null, obviously null.stream() is throwing the exception. Why don't you initialize it? — bvrakvs
– bvrakvs, Commented Nov 3, 2018 at 7:38

Nicholas K · Accepted Answer · 2018-11-03 07:38:33Z

1

As per your comment you are declaring it as

static ArrayList<Credit_rating_details> Credit = null;

which is causing the NPE as you are performing an operation on a null object. Change it to

static ArrayList<Credit_rating_details> Credit = new ArrayList<Credit_rating_details>();

answered Nov 3, 2018 at 7:38

Nicholas K

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