java-tutorials/core-java-modules/core-java-9/compile-student-service-dbimpl.bat

javac --module-path mods -d mods/com.baeldung.student.service.dbimpl^
 src/modules/com.baeldung.student.service.dbimpl/module-info.java^
 src/modules/com.baeldung.student.service.dbimpl/com/baeldung/student/service/dbimpl/StudentDbService.java