parent-modules com.baeldung 1.0.0-SNAPSHOT 4.0.0 protobuffer com.google.protobuf protobuf-java ${protobuf.version} junit junit ${junit.version} test org.apache.maven.plugins maven-compiler-plugin ${maven-compiler-plugin.version} 1.8 1.8 3.2.0 4.12 3.6.0