Spring Boot throws exception when int field in mongodb model has null value in the database

Question

I have a situation when a user does not enter data for certain field I pass null as value for that int field to signify that no value was entered by the user like

{user: 'John',
 age: null}

but when I read such document in my Spring Boot application, when it encounters above document, throws

Caused by: java.lang.IllegalArgumentException: Parameter age must not be null!

Is null allowed value in mongodb or Spring Boot is doing something wrong?

I tried to:

@Data
@Document
public class User {
    final private String user;
    @org.springframework.lang.Nullable    
    final private int age;
}

But it makes no difference. How to solve this problem other than not storing null ( because null is already populated in another node/mongoose application (which gladly stores and reads null values without any issue) using the same mongodb database?

What are u seeing if you change age as Integer instead of int ? — Rahul Raj
– Rahul Raj, Commented Apr 4, 2018 at 18:40
I replaced int with Integer and it fixed the problem. Not sure why it did not work with int. thank you — ace
– ace, Commented Apr 4, 2018 at 19:08

halfer · Accepted Answer · 2021-07-27 23:47:19Z

7

Replace int with Integer since int is a primitive type which won't accept null values. Integer is a wrapper object that accepts null values.

edited Jul 27, 2021 at 23:47

halfer

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answered Apr 4, 2018 at 19:09

Rahul Raj

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