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I have a Spring  `@ConfigurationProperties(prefix = "foo") data class Foo(val bar: Int?)`, when I write `foo.bar: "baz"` in my application.yaml, it still launches the application anyway and foo ends up being null. I want it to crash instead. Does anyone know if there's an easy way to achieve this?

I must've oversimplified something. A friend confirmed that this crashes as expected for him, so digging into what's different :slightly_smiling_face:

Hi, so you both have different outcomes given the same setup?

I was debugging a similar thing and understood that Spring can silently pass null. I think you will get the expected errors if you have
some: 
  foo:
    bar: "baz"
instead

We ended up testing with the wrong version of our code.. so the string was actually just never used.. :man-facepalming: :homer-disappear:

It errored as expected in all scenarios I could come up with when trying to come up with a minimal reproducer..

I hope you figure out what scenario ended up with a silent null on your end though