Spring @Value NullPointerException

Question

I have an Integer autowired in constructor like that:

@Value("${application.someNumber:0}") Integer number)

And there is NullPointerException if nmber is null in configuration. How to write this expression so that if it is null then it would be set to 0 ? Then I would throw my own validation expetion somewhere else.. ?

it does set default value if not present isn't it? or i dont get the question — Amit Naik, May 27 '20 at 09:02
Worth taking a look at this : https://stackoverflow.com/questions/37143562/using-value-with-condition-in-spring-in-order-to-map-value-to-string — T Anna, May 27 '20 at 09:02
Is `)` at the end typo? Update the question with a larger code snippet. — Smile, May 27 '20 at 09:09

score 1 · Answer 1 · edited May 27 '20 at 09:53

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If you want to use @Value annotation in the constructor, you must annotate the constructor itself with @Autowired. Also the class must be a spring managed bean (component, service...)

edited May 27 '20 at 09:53

Smile

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answered May 27 '20 at 09:33

zlaval

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score 0 · Answer 2 · answered May 27 '20 at 09:04

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First you should remove the ) at the end. As for your question. You can simply assign 0 to number like so:

Integer number = 0;

When the injected value is null number will keep the original value of 0, if it is not null it will get the injected value

answered May 27 '20 at 09:04

Maurice

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But it is injected in constructor so I cannot assign 0 – michealAtmi May 27 '20 at 09:08
then in the body of the constructor you add the following: `if (number == null) number = 0;` – Maurice May 27 '20 at 10:59

Spring @Value NullPointerException

2 Answers2