问题
I used jarsigner to sign my jar file. But I got a warning:
Warning:
This jar contains entries whose signer certificate will expire within six months.
How can I make it never expire or expire in a longer time?
回答1:
Specify the required number of days in the -validity parameter to keytool.
Addendum: -validity is an option to keytool.
keytool -genkey -alias sawyer -validity 1234 -dname "…"
After you create the new key, use its unique alias with jarsigner to sign your JAR.
来源：https://stackoverflow.com/questions/6171554/how-to-sign-a-jar-to-never-expire