CODEWITHSUNDEEP
javaexception
java-user
java-user

Reputation: 29

How to return List of String as Error message in response while throwing an error?

I have created a custom exception and I want to throw an Exception which throws the exception with the list of integer. How do I do that? I know I can simple pass a message in Exception. But I want to pass a List as a Message in exception.

class HelloWorld {
    public static void main(String[] args) {
         List<Integer> invalidAges = new ArrayList<>();
         for(int i = 0 ; i <10;i++) invalidAges.add(i);

    throw new InvalidAgesException(invalidAges); 
    }
}

class InvalidAgesException extends RuntimeException {
    private final List<Integer> invalidAges;

    public InvalidAgesException(List<Integer> invalidAges) {
        this.invalidAges = invalidAges;
    }

    public List<Integer> getInvalidAges() {
        return invalidAges;
    }
}

Output should be : Exception: [1,2,3,4,5,6,7,8,9,10]

Upvotes: 0

Views: 2864

Answers (1)

Henry Twist
Henry Twist

Reputation: 5990

Your code here is fine, but I presume you're looking for the exception to actually print your list to the stack trace.

In this case you can just pass it to the constructor of RuntimeException which accepts a String as a message:

public InvalidAgesException(List<Integer> invalidAges) {

    super(invalidAges.toString());
    this.invalidAges = invalidAges;
}

Alternatively you can override the getMessage method of the exception:

public String getMessage() {

    return invalidAges.toString();
}

Upvotes: 1

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