jdeps -genmoduleinfo completes without an informative message when run against a jar that is a module:

———
jar --print-module-descriptor --file=java.transaction.jar

Name:
  java.transaction
Requires:
  java.sql [ PUBLIC ]
  java.rmi [ PUBLIC ]
  javax.enterprise.cdi.api [ PUBLIC ]
  javax.interceptor.javax.interceptor.api
  java.base [ MANDATED ]
Exports:
  javax.transaction
ljanders-mac:upath ljanders$ jdeps -genmoduleinfo src java.transaction.jar
ljanders-mac:upath ljanders$ ls -R
java.transaction.jar src

./src:
ljanders-mac:upath ljanders$
————

It would be useful to provide some sort of message to help the user understand why no info was provided