I want to be able to use `main` function inside `jvmMain` to test the library I’m working on, but wh...

# multiplatform

[KamilH]

I want to be able to use main function inside jvmMain to test the library I’m working on, but when I’m trying to run main function it returns Error: Could not find or load main class MainKt for following function in Main.kt

fun main() {
    runBlocking {
        userRepository.registerUser("")
    }
}

Are there any additional steps I should make to be able to use this?

[faogustavo]

is the JDK configured correctly for the project?

[KamilH]

Are you referring to this one?

[faogustavo]

and on the target? Do you have something like this 👇?

jvm {
            compilations.all {
                kotlinOptions.jvmTarget = "1.8"
            }
        }

[KamilH]

Thanks! I didn’t have this, but I tried to add this and it still doesn’t work

[KamilH]

I assume such main function is working in your case. That’s why I would like to ask you if you can choose your class (containing main) under “Edit configuration” -> “Main class”? When I’m trying to do it it’s either not finding the class or not allowing me to choose it

[faogustavo]

Here works normally 🤔

[faogustavo]

is your function in the root? without any package?

[faogustavo]

even with the file in the root dir is working normally 🤔

[mbonnin]

Main you need the args in the signature ? fun main(args: Array<String>)

[KamilH]

@faogustavo thank you for checking, everything seems the same on my side, so I have no idea why it’s not working
@mbonnin it doesn’t help unfortunately

What is more - I saw this discussion and message:
https://kotlinlang.slack.com/archives/C3PQML5NU/p1588501634307700?thread_ts=1588441008.300900&cid=C3PQML5NU
and I cloned “PeopleInSpace” project and tried to run it there (according to the message I linked to) and it failed with exactly the same message, so I guess it must be a JDK (?) linking problem or something like that

[faogustavo]

Thats curious, I’m having the same problem if I try to run with an android target 🤔

[KamilH]

You mean main function inside androidMain?

[faogustavo]

yep

[faogustavo]

[KamilH]

You are lucky, because you at least can run it inside jvmMain which is not working in my case 🙂

[faogustavo]

In this KMM project it doesn’t work even in the jvmMain 😬

[KamilH]

That is really interesting

[faogustavo]

maybe in the kotlin issue tracker https://youtrack.jetbrains.com/issues/KT, didn’t find any bug-report channel

[Sebastian Sellmair [JB]]

Just because I am curious, you're trying to run a main function on your local machine. The main function is placed inside androidMain wich is a source set for an Android target, right?

[Sebastian Sellmair [JB]]

Also, you do have a gradle based multiplatform project and you would like to execute the main function using IntelliJ over Gradle?

[KamilH]

@Sebastian Sellmair [JB] I wanted to make it 100% clear so I decided to record short video showing steps to reproduce this problem (you can skip from 0:20 to 1:20). As you can see on the vide, I’m creating a new Library project in IntelliJ, I’m adding main function in the jvmMain module, I’m trying to run it and I’m getting an error. Next I’m commenting-out android-related stuff in build.gradle and trying to run main function again and now it works

idea_problem.mov

[faogustavo]

Any updates about this? I’m facing the same problem now 😬

[KamilH]

I reported this here: https://youtrack.jetbrains.com/issue/KT-42486
And then it was merged with this one: https://youtrack.jetbrains.com/issue/KT-35890 (seems like a general problem with coexistence of Android and JVM targets in one project)
I’m still using a workaround to comment-out Android specific stuff

[faogustavo]

Noice!! I also saw on the 35890 ticket that if you add the -cp $Classpath$ to the vmoptions it works too 🙂

[KamilH]

Good catch, thanks. I will test it later 🙂

[faogustavo]

If you want to take a look, I commited that on my repo (https://github.com/faogustavo/kached/commit/273222178fd69341df00870c2ebfd0e60cc65913). Just look for the demo/gson-memory-demo/build.gradle.kts file

[faogustavo]

if you need any help with that call me on PV that I try to help you out 🙂

[KamilH]

Thank you! 🙂