This post demonstrates how to use a Maven dependency written in Kotlin in a Java Maven project.

Kotlin Maven Project

Previously, we created a Maven project that only contains Kotlin codes. Please go through the post before reading further.

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Kotlin – How to create Maven project for Kotlin

Maven Dependency to use

We now update our pom.xml to include a Maven dependency to this jar.

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...
  <dependencies>
    <dependency>
      <groupId>com.turreta.maven.kotlin</groupId>
      <artifactId>com-turreta-maven-kotlin</artifactId>
      <version>1.0-SNAPSHOT</version>
    </dependency>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>3.8.1</version>
      <scope>test</scope>
    </dependency>
  </dependencies>
...

...

<groupId>com.turreta.maven.kotlin</groupId>

<artifactId>com-turreta-maven-kotlin</artifactId>

<version>1.0-SNAPSHOT</version>

</dependency>

<groupId>junit</groupId>

<artifactId>junit</artifactId>

</dependency>

</dependencies>

...

Where’s the Kotlin Runtime Maven dependency?

Somehow the Kotlin library we created included its pom.xml within the jar file.

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The pom.xml already contains the Maven dependency to the Kotlin runtime library.

Using the library

The class name “HelloKt” is based on “Hello.tk” from the Kotlin Maven project.

import com.turreta.maven.kotlin.HelloKt;

public class KotlinLibraryDemo {
	public static void main(String[] args) {
                // This was written in Kotlin
		HelloKt.sayHello();
	}
}