How to renew a jar signature?

Warning: The signer certificate has expired.

I get the following when I try to sig开发者_开发技巧n with jarsigner, and the output jar doesn't get generated.

How do I renew my jar signature?

Are you using a self-signed certificate? If so, you just need to use keytool to generate a new certificate, then sign your jar using keysigner.

If you are using a third-party signed certificate (Verisign, Thawte, etc), you'll need to renew your key using their online system (usually the same place you got the original cert).