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kotlinlang

Hi guys, I'm having problems making Boot validate a `@ConfigurationProperties` class for me. I have configure the  `@Bean` method like this:
```
    @Bean
    @ConfigurationProperties(prefix = "slugservice.articles", exceptionIfInvalid = true)
    fun slugServiceProperties() = SlugServiceProperties()

@Validated
open class SlugServiceProperties @JvmOverloads constructor(@Min(10) var slugSize: Int = 70,
                                                           var normalizerForm: Normalizer.Form = Normalizer.Form.NFD)

```
, but I don't get an exception when I try to start the app. Anyone recognize that? Boot 1.5.1, Kotlin 1.0.6.