Does Kotlin support the annotations present in `org.springframework.lang`? The online Javadoc for th...

# spring

[Pritt Balagopal]

Does Kotlin support the annotations present in org.springframework.lang? The online Javadoc for the website does indicate that it does https://docs.spring.io/spring-framework/docs/current/javadoc-api/org/springframework/lang/package-summary.html however, on Kotlin's own source file, it is not mentioned anywhere here: https://github.com/JetBrains/kotlin/blob/master/core/compiler.common.jvm/src/org/jetbrains/kotlin/load/java/JvmAnnotationNames.kt. I am confused, does Kotlin support it or not? And if so, how does it do so despite not being listed?

[JasonB]

why would you expect Spring's annotations to be specifically recognized by the Kotlin compiler?

[JasonB]

you understand there are thousands of annotations in Java and Kotlin libraries that are not listed here, right?

[Pritt Balagopal]

@JasonB I know Kotlin can recognize nullability annotations from Android, Lombok, FindBugs, Eclipse, and JetBrains. I presumed this was due to their efforts to interop with Java as best as they could. So, it stands to reason I could reasonably expect Spring annotations to be recognized by Kotlin, since Spring is a very popular framework

[JasonB]

you know what, I misunderstood what annotations you were referring to

[JasonB]

if you look at the source, though, you can see that they used the javax.annotation annotations to mark these, which Kotlin does recognize

[JasonB]

the Spring annotations are also marked as deprecated since Spring 7 in favor of JSpecify

[JasonB]

https://github.com/spring-projects/spring-framework/blob/5b1c55252e7d2b50df48b3eae[…]pring-core/src/main/java/org/springframework/lang/Nullable.java

[Pritt Balagopal]

Oh neat, I see.

Also, the current version of Spring is 6 right? That means the deprecation will only start after Spring 7 is made stable

[Klitos Kyriacou]

That's correct, the current version is 6. Spring Framework 7.0.0 is scheduled to be released in November according to their website. Kotlin 2.2.0 will support JSpecify: https://youtrack.jetbrains.com/issue/KT-75371

[sdeleuze]

With Spring Framework 6, you need to configure the Kotlin compiler with -Xjsr305=strict since org.springframework.lang nullness annotations are meta-annotated with JSR 305 ones.

With Spring Framework 7, JSpecify annotations will be recognized out-of-the-box.