Unable to import classes from kotlin dependency

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1

Hi,

Version:
Gradle: 8.5
JDK: 11
IDE - Intellij IDEA

I am facing a challenge while importing some dependencies in a gradle-based kotlin project. These dependencies are third-party libraries. Some of these are kotlin projects, while some are java based.

Issue: When i define them as dependencies in build.gradle, I’m unable to import any classes from the jars (of kotlin projects) in my src code. It fails to recognize them. But i’m able to easily import the classes from the java based project jars.

For the kotlin ones, in the IDE, under project > External Libraries > It displays the dependency as a zip file (highlighted in the screenshot). That is not the case for other dependencies like java based,

image
image927×622 75.2 KB

The dependencies are indeed published as zip files. Now, what additional would be needed in my project’s build.gradle to extract the jars from the zip and be able to import its underlying classes ?

This is the build.gradle.kts file for my sample-project.

plugins {
    kotlin("jvm") version "1.9.0"
    application
}

repositories {
    mavenCentral()
    mavenLocal()
    maven {
        url = uri("https://plugins.gradle.org/m2/")
    }
    maven {
        url = uri("https://aws.oss.sonatype.org/content/repositories/snapshots")
    }

}

group = "org.example"
version = "1.0-SNAPSHOT"
var kotlin_version = System.getProperty("kotlin.version", "1.9.0")

dependencies {
    implementation("org.jetbrains.kotlin:kotlin-stdlib:${kotlin_version}")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-common:${kotlin_version}")
    implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk7:${kotlin_version}")
    implementation("org.jetbrains.kotlinx:kotlinx-coroutines-core:1.3.9")
    implementation("junit:junit:4.13")
    implementation("org.apache.logging.log4j:log4j-api:2.16.0")
    implementation("org.apache.logging.log4j:log4j-core:2.16.0")
    implementation("org.opensearch.plugin:opensearch-cross-cluster-replication:3.0.0.0-SNAPSHOT")
    implementation("org.opensearch.plugin:alerting:3.0.0.0-SNAPSHOT")
    implementation("org.opensearch.plugin:opensearch-index-management:3.0.0.0-SNAPSHOT")
    implementation("org.opensearch:opensearch-job-scheduler-spi:3.0.0.0-SNAPSHOT")
    testImplementation(kotlin("test"))
}
tasks.test {
    useJUnitPlatform()
}

kotlin {
    jvmToolchain(8)
}

application {
    mainClass.set("MainKt")
}

And this is the build.gradle of one of the dependencies I’m trying to use!
Wanted to understand if something additional is needed in my project or in the dependency?

2

That’s not a Java vs. Kotlin thing, as you see the libs above that one that are also Kotlin libs are fine.
If you have a look at https://repo1.maven.org/maven2/org/opensearch/plugin/opensearch-cross-cluster-replication/2.12.0.0/opensearch-cross-cluster-replication-2.12.0.0.pom you see that this artifact is published with packaging set to zip and if you look at Central Repository: org/opensearch/plugin/opensearch-cross-cluster-replication/2.12.0.0 you see that indeed the pom and the zip is published and nothing else.

So whatever that artifact is, it is not a jar that you should consume as library in your project.

Not knowing what opensearch is or how it works, from the little I have seen I’d guess that those zips are something you throw into some opensearch infrastructure so that they extend the functionality.

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