parent-modules com.baeldung 1.0.0-SNAPSHOT 4.0.0 maven-java-kotlin jar 1.8 1.2.51 org.jetbrains.kotlin kotlin-stdlib-jdk8 ${kotlin.version} kotlin-maven-plugin org.jetbrains.kotlin ${kotlin.version} compile compile ${project.basedir}/src/main/kotlin ${project.basedir}/src/main/java test-compile test-compile ${project.basedir}/src/test/kotlin ${project.basedir}/src/test/java org.apache.maven.plugins maven-compiler-plugin 3.1 ${java.version} ${java.version} default-compile none default-testCompile none java-compile compile compile java-test-compile test-compile testCompile