SpringBoot Support constructor validation during configuration properties binding

See example project: https://github.com/HStoyanov-augglobal/springboot-prop-validation-issue

There is a record org.example.Props with @ConstructorBinding annotation whose properties i want to verify using the @MyValidProp custom validator. This validator and the out-of-the-box @Size validator are not being called at all. The properties themselves are validated only after the record has been constructed.

Comment From: wilkinsona

Thanks for the sample. At the moment, constructor validation with @ConfigurationProperties isn't supported. In your example @NotBlank works because it is propagated to a location where it can then be processed by post-construction validation. @Size does not work because it's only present on the constructor. I'll leave this issue open as we may want to explore supporting validation during constructor binding in the future.

Comment From: likhith5697

Hi @wilkinsona, I see this enhancement is currently open and not yet assigned. I’d be interested in exploring an implementation to support validation during constructor binding for @ConfigurationProperties.

Could you please confirm if this is open for community contribution? If yes, I can start by reviewing how ValidationBindHandler and ConfigurationPropertiesBinder manage post-construction validation, and draft an approach to handle parameter-level constraints before instantiation.

Thanks!