When packaging a legacy jar the message is produced:

Module jdk.jvmstat does not exist.
Module jdk.management.agent does not exist.
Module java.management.rmi does not exist.
Module jdk.vm.ci does not exist.

jdk.jvmstat was renamed at some point to jdk.internal.jvmstat so it should be removed.
Same for jdk.vm.ci, jdk.internal.vm.ci so it should be removed.
jdk.management.agent and java.management.rmi have a space at the end of the line. I'm not sure how that got passed jcheck.