Hi ! I've checked the docs for <compiling Java and...

# server

[Paul-Arthur Thiery]

Hi ! I've checked the docs for compiling Java and Kotlin together with Maven, and I've scrupulously copied the pom.xml setup, however I'm still get Unresolved Reference for every single import in my .kt files. Using the builtin Intellij compiler works fine however ! Is this a known issue ?

[Larry Meadors]

this is more of a hint than an answer: i had that issue a loooong time ago trying to mix both in a single project - it turned out that maven would do EITHER "java, then kotlin" or "kotlin then java" compilation (at least then) i am not sure if that is still the case. so if you use BOTH kotlin classes from java and java classes from kotlin, that might be your issue as well.

[Larry Meadors]

i ended up splitting them apart (and then later scrapped all the java stuff)

[Paul-Arthur Thiery]

really ???? there's no way I can do that in my case 😞

[Larry Meadors]

you could try swapping the plugin order in the pom, but i have a feeling you will have the opposite problem then (your java classes won't exist for your kotlin classes)

[Larry Meadors]

hm - https://stackoverflow.com/questions/37652948/kotlin-maven-plugin-order-of-compilation

[Larry Meadors]

that seems to indicate that the kotlin plugin doesn't need the java classes

[Paul-Arthur Thiery]

yeah 🤔

[Paul-Arthur Thiery]

I'm also seeing this https://stackoverflow.com/a/52119648

[Paul-Arthur Thiery]

would it work if I put all the .kt files in a different directory ?

[Paul-Arthur Thiery]

I thought I tried that though 🤔

[Larry Meadors]

maybe try a small sample project in github - less baggage makes this kind of thing easier to try 🙂

[Larry Meadors]

...and if you DO get it working, share the trick - i would love to start using kotlin in some of my older projects

[Alexis Manin]

I've done it once. To mix kotlin and java in the same maven module, I've followed this tutorial :
https://www.baeldung.com/kotlin/maven-java-project

[Paul-Arthur Thiery]

That's what I've followed as well 🤔

[Paul-Arthur Thiery]

might have missed smth, will review

[Alexis Manin]

Ensure to define kotlin compiler to execute before java compiler, and that your maven version is up-to-date (maven sometimes has nasty bugs, I've encounterdd more than once projects compilable only with latest maven)

[Paul-Arthur Thiery]

I should be covered on that, but I could have missed a line somewhere in my pom file

[Paul-Arthur Thiery]

I'm trying it right now with a clean and mostly empty project

[Paul-Arthur Thiery]

Ok I made it work loading

[Paul-Arthur Thiery]

I was missing the kotlin-test dependency (I thought this was used for tests only), as well as the phase elements in kotlin-maven-plugin 's executions section

[Larry Meadors]

🕺

[Paul-Arthur Thiery]

So yeah indeed, Baeldung is king, as always !

[Paul-Arthur Thiery]

Thanks a lot ! 🎉

[Larry Meadors]

cool, man - thanks for sharing the solution