The Java Tutorials have been written for JDK 8. Examples and practices described in this page don't take advantage of improvements introduced in later releases and might use technology no longer available.
See Java Language Changes for a summary of updated language features in Java SE 9 and subsequent releases.
See JDK Release Notes for information about new features, enhancements, and removed or deprecated options for all JDK releases.
Now acting as Ruth, who receives the signed JAR file and the certificate file from Stan, perform the following steps.
keytool
-import
command.jarsigner
tool.