pom.xml

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
  xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
  <modelVersion>4.0.0</modelVersion>

  <groupId>ch.pennec.kotlin</groupId>
  <artifactId>QuickStart</artifactId>
  <version>1.0-SNAPSHOT</version>
  <packaging>jar</packaging>

  <name>QuickStart</name>
  <url>http://maven.apache.org</url>

  <properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <kotlin.version>1.1.3</kotlin.version>
    <kotlin.compiler.incremental>true</kotlin.compiler.incremental>

  </properties>

  <build>
    <sourceDirectory>${project.basedir}/src/main/kotlin</sourceDirectory>
    <testSourceDirectory>${project.basedir}/src/test/kotlin</testSourceDirectory>

    <plugins>
      <plugin>
        <artifactId>kotlin-maven-plugin</artifactId>
        <groupId>org.jetbrains.kotlin</groupId>
        <version>${kotlin.version}</version>
        <executions>
          <execution>
            <id>compile</id>
            <goals> <goal>compile</goal> </goals>
            <configuration>
              <sourceDirs>
                <sourceDir>${project.basedir}/src/main/kotlin</sourceDir>
                <sourceDir>${project.basedir}/src/main/java</sourceDir>
              </sourceDirs>
            </configuration>
          </execution>
          <execution>
            <id>test-compile</id>
            <goals> <goal>test-compile</goal> </goals>
            <configuration>
              <sourceDirs>
                <sourceDir>${project.basedir}/src/test/kotlin</sourceDir>
                <sourceDir>${project.basedir}/src/test/java</sourceDir>
              </sourceDirs>
            </configuration>
          </execution>
        </executions>
      </plugin>
      <plugin>
        <groupId>org.apache.maven.plugins</groupId>
        <artifactId>maven-compiler-plugin</artifactId>
        <version>3.5.1</version>
        <executions>
          <!-- Replacing default-compile as it is treated specially by maven -->
          <execution>
            <id>default-compile</id>
            <phase>none</phase>
          </execution>
          <!-- Replacing default-testCompile as it is treated specially by maven -->
          <execution>
            <id>default-testCompile</id>
            <phase>none</phase>
          </execution>
          <execution>
            <id>java-compile</id>
            <phase>compile</phase>
            <goals> <goal>compile</goal> </goals>
          </execution>
          <execution>
            <id>java-test-compile</id>
            <phase>test-compile</phase>
            <goals> <goal>testCompile</goal> </goals>
          </execution>
        </executions>
      </plugin>
    </plugins>
  </build>

  <dependencies>
    <dependency>
      <groupId>junit</groupId>
      <artifactId>junit</artifactId>
      <version>4.12</version>
      <scope>test</scope>
    </dependency>
    <dependency>
      <groupId>org.jetbrains.kotlin</groupId>
      <artifactId>kotlin-stdlib</artifactId>
      <version>${kotlin.version}</version>
    </dependency>
    <dependency>
      <groupId>org.mockito</groupId>
      <artifactId>mockito-core</artifactId>
      <version>2.8.47</version>
    </dependency>
  </dependencies>
</project>