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kotlinlang

Hi!
I get error `BeanFactory has not been injected into @Configuration class` when all beans are declared this way:
```
@get: Bean
val securityEvaluationContextExtensionProvider = SecurityEvaluationContextExtension()
```
but when at least one bean is declared the normal way 
```
@Bean
fun authenticationProvider(): DaoAuthenticationProvider = DaoAuthenticationProvider().apply {
    setUserDetailsService(userDetailsServiceProvider)
}
```
all works perfect. Is it a bug or I have to inject `BeanFactory` manually?
I'm using Spring-Boot 2.0.0.RC1