4.0.0 core-java-9-jigsaw core-java-9-jigsaw pom library-core com.baeldung.core-java-modules core-java-modules 0.0.1-SNAPSHOT core-java-9-jigsaw org.apache.maven.plugins maven-compiler-plugin ${maven-compiler-plugin.version} ${maven.compiler.source} ${maven.compiler.target} 1.9 1.9