I’ve got a weird issue with, I think, the kotlin s...

# announcements

[bbaldino]

I’ve got a weird issue with, I think, the kotlin sdk version between intellij and maven. If I run my unit test from intellij (via the run configuration) it runs fine. If I run via maven (both from the command line and via the intelllij maven lifecycle actions) I get a complaint about, effectively, a smart-cast not working. In my pom.xml I have the kotlin version set to 1.3.72 and everywhere in project structure in intelllij seems to agree with that, but it looks like intellij’s is using another version. I would normally just ignore this, but if I try and change my code to not rely on the smart cast, intellij keeps warning me about “unnecessary cast” (and I have -werror enabled, so I can’t build with the warning). Where else can I check for a place where a version might be set incorrectly? I do know that the kotlinc plugin is 1.4.31, but I thought it should still be running “as” 1.3.71 if that’s set everywhere.

[bbaldino]

Here’s the Modules section in Project Settings

[ephemient]

it could be new type inference, during version 1.3 the Kotlin plugin turned it on by default while it was still off in the compiler

[ephemient]

if unchecking "Preferences » Kotlin Compiler » Enable new type inference algorithm for IDE analysis" makes it stop working in the IDE that's definitely it

[bbaldino]

Hmm I don’t even see that option.

[ephemient]

oh if your plugin is 1.4 then it's always on

[bbaldino]

image.png

[ephemient]

you can turn it on in Gradle with something like

allprojects {
    tasks.withType<KotlinCompile>().configureEach {
        kotlinOptions {
            freeCompilerArgs += "-XXLanguage:+NewInference"
        }
    }
}

[ephemient]

but ideally you just upgrade to 1.4

[bbaldino]

I did previously find that it had 1.4 for language/api version there and changed that, but that didn’t help (and I think those values are supposed to be overridden by the settings from pom.xml anyway)

[bbaldino]

I’m using maven, but I’ll try adding that arg to enable it

[bbaldino]

No luck, the maven builds still fail due to not “seeing the smart cast from the contract

[bbaldino]

I had tried adding -Xopt-in=kotlin.contracts.ExperimentalContracts before as well, but no luck.

[ephemient]

you might just have to rewrite code to be 1.3-compatible without the IDE's help, or upgrade to 1.4. I guess the plugin has too much 1.4 behavior built in that it doesn't accurately act like 1.3

[bbaldino]

Yeah. I originally added a manual “as” line there to make it 1.3 style, but thought intellij warned which broke the build (because of -werror), but I don’t actually have -werror in test-compile so that could work…

[bbaldino]

Although the IDE flags is as unnecessary, which is annoying