How to validate if a signed jar contains a timestamp?

Question

After a jar is signed and the -tsa option was used, how can I validate that the time stamp was included? I tried:

jarsigner -verify -verbose -certs myApp.jar         


        

Answer 1

From https://blogs.oracle.com/mullan/entry/how_to_determine_if_a:

You can use the jarsigner utility to determine if a signed JAR has been timestamped as follows:

jarsigner -verify -verbose -certs signed.jar

where signed.jar is the name of your signed JAR. If it is timestamped, the output will include lines of the following indicating the time it was signed:

[entry was signed on 8/2/13 3:48 PM]

If the JAR is not timestamped, the output will not include those lines.