Provide example showing how to save and load existing certificates about acme4j

[cowwoc]

Works for me. Thank you.

[shred]

Please see the answer I gave in issue 146: #146 (comment)

You need to store the certificate location somewhere.

Certificate cert = // the certificate that was freshly created
URL certLocation = cert.getLocation();
// store certLocation somewhere

To reconstruct the Certificate instance from that location, bind it to a Login:

Login login = // your login
URL certLocation = // certLocation that was stored

Certificate cert = login.bindCertificate(certLocation);