4.0.0 core-java-12 0.1.0-SNAPSHOT core-java-12 jar http://maven.apache.org com.baeldung parent-modules 1.0.0-SNAPSHOT ../../ org.assertj assertj-core ${assertj.version} test org.apache.maven.plugins maven-compiler-plugin ${maven-compiler-plugin.version} ${maven.compiler.source.version} ${maven.compiler.target.version} --enable-preview 12 12 3.6.1