--module-path

After packaging code into a JAR file you can put that JAR onto the --module-path in the same way you would a folder of classes.

java \
    --module-path ex.mod.jar \
    --add-modules ALL-MODULE-PATH
    some.pkg.Main

If you have multiple JARs to put on the module path you can do so by separating them with a :.¹

java \
    --module-path ex.mod.jar:other.thing.jar \
    --add-modules ALL-MODULE-PATH
    some.pkg.Main

Instead of --add-modules ALL-MODULE-PATH followed by a class name you can use --module followed by <module name>/<class name>

java \
    --module-path ex.mod.jar \
    --module ex.mod/some.pkg.Main

On Windows instead of a : you use a ;. I am assuming when making these examples that you are using Windows Subsystem for Linux. If you are not, just adjust as needed. ↩

Modern Java