Hi,
I tried
jarsigner -verify -verbose frmall.jar | grep "expire"
on 11.5.10 I received:
java.util.zip.ZipException: error in opening zip file
at java.util.zip.ZipFile.open(Native Method)
at java.util.zip.ZipFile.<init>(ZipFile.java:140)
at java.util.jar.JarFile.<init>(JarFile.java:140)
at java.util.jar.JarFile.<init>(JarFile.java:91)
at sun.security.tools.JarSigner.verifyJar(JarSigner.java:499)
at sun.security.tools.JarSigner.run(JarSigner.java:228)
at sun.security.tools.JarSigner.main(JarSigner.java:106)
Go to the directory where your jar file exist and then run the command . (Replace the jar file name given in the following example with the name of your jar file )