Hi! Spring has a WebClient interface, written in J...

# announcements

[mplain]

Hi!
Spring has a WebClient interface, written in Java
That interface has the following method:

contentType(MediaType contentType)

In my Kotlin code I call that method, passing a null
Intellij IDEA Ultimate 2020.2 highlights it in red, saying:
Null cannot be a value of a non-null type MediaType
But there are no special annotations on the interface method
Why does this happen, and how do I handle it?

(I actually pass a nullable value, and the DefaultWebClient implementation calls a method annotated with @Nullable, so it can work with nulls)

[thanksforallthefish]

more suited in #spring but either way spring has a way of marking entire packages to only accept non null parameters. I think it is package-info , it should be part of webflux library

[mplain]

is this integration with Idea, or with the compiler?

[mplain]

anyway, cool! thanks 🙂

[thanksforallthefish]

I think it is only ide, but I don’t know if it is also somehow integrated in build tools like gradle or other plugins. but it is not a compiler plugin (pretty sure of this)

[Arian Stolwijk]

The kotlin compiler picks up JSR-305 annotations at least. Apparently https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/lang/NonNullApi.html applies it to all java methods