Tried using arrow-kt 1.0.1 and I can not import arrow.core Version 1.0.0 seems to work. Any idea why...

# arrow

[Ovidiu Ionescu]

Tried using arrow-kt 1.0.1 and I can not import arrow.core
Version 1.0.0 seems to work. Any idea why arrow.core is unavailable in 1.0.1?
(project uses maven)

[simon.vergauwen]

It’s working fine for me in this project. https://github.com/nomisRev/Saga/blob/main/libs.versions.toml#L2

[Daniel Berg]

Same here. I’ve just started looking into it though.

[Ovidiu Ionescu]

I tried 1.0.2-SNAPSHOT and I still can not import arrow.core
Made a hello world maven project with the issue:
https://github.com/ovidiu-ionescu/broken-arrow

[simon.vergauwen]

Ah, I see you’re using maven. I think the docs on this might be outdated. We support Kotlin MPP now, and I think the dependency for Maven needs to have a postfix -jvm.

<dependency>
    <groupId>io.arrow-kt</groupId>
    <artifactId>arrow-core-jvm</artifactId>
</dependency>

[simon.vergauwen]

Gradle can automatically resolve that but I guess Maven cannot.

[raulraja]

I was just replying the same, i wonder how it works in maven for KMP stuff.

[Daniel Berg]

I’m using gradle though. Still cannot import it.

[Daniel Berg]

Btw, I’m looking at the gradle cache. The pom file dependencies on version 1.0 is

[Daniel Berg]

<dependencies>
    <dependency>
      <groupId>io.arrow-kt</groupId>
      <artifactId>arrow-core-jvm</artifactId>
      <version>1.0.0</version>
      <scope>compile</scope>
    </dependency>
  </dependencies>

[Daniel Berg]

And version 1.0.1

[Daniel Berg]

<dependencies>
    <dependency>
      <groupId>io.arrow-kt</groupId>
      <artifactId>arrow-continuations</artifactId>
      <version>1.0.1</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>io.arrow-kt</groupId>
      <artifactId>arrow-annotations</artifactId>
      <version>1.0.1</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.codehaus.mojo</groupId>
      <artifactId>animal-sniffer-annotations</artifactId>
      <version>1.19</version>
      <scope>runtime</scope>
    </dependency>
    <dependency>
      <groupId>org.jetbrains.kotlin</groupId>
      <artifactId>kotlin-stdlib-common</artifactId>
      <version>1.5.31</version>
      <scope>runtime</scope>
    </dependency>
  </dependencies>

[Ovidiu Ionescu]

I used arrow-core-jvm and now it works

Out of curiosity: if I click on external libraries in Intellij and expand arrow-core -> arrow -> core I can see Either listed as a Kotlin class. Same for arrow-core-jvm. What makes one work and the other not?

[Daniel Berg]

Yep, I did the same thing. Replaced "io.arrow-kt:arrow-core:$arrowVersion" with "io.arrow-kt:arrow-core-jvm:$arrowVersion"

[raulraja]

The way I understand this in KMP is that the root artifact arrow-core contains the commonMain metadata and IR stuff for each platform and the actual platform specific binaries or IRs live in the -jvm, -whateverPlatform

[raulraja]

I think the issue here is that previously arrow was just a JVM project published at the same root coordinates.

[raulraja]

JVM only projects need to change the artifact id to use the jvm platform now unless they use the gradle KMP plugin and setup the project with a jvmMain target

[raulraja]

In that case they can use just arrow-core and gradle resolves the platform specific artifacts for each configured target

[Javier]

in only jvm projects there is no need to use -jvm too, that is strange, I will try

[Javier]

it is working for me, maybe a old cache is generating a conflict?

[Ovidiu Ionescu]

I looked inside the pom file of release 1.0.0. of arrow-core and it has a dependency on arrow-core-jvm. In 1.0.1 the dependency entry is gone from the pom. I think this is the reason 1.0.0 works and 1.0.1 does not.

[thanh]

1.0.1 works for me too: https://github.com/lenguyenthanh/sparrow

[Javier]

The problem is only with maven, Gradle should work. A fix will be added asap