Troubleshoot Android packaging issues

Here are troubleshooting tips for issues you may encounter when packaging your Android app.

Unexpected warning regarding a timestamp

If you are packaging with Java version 1.7.51 or later, you may receive this message:

Warning: No -tsa or -tsacert is provided and this jar is not timestamped. Without a timestamp, users may not be able to validate this jar after the signer certificate's expiration date (YYYY-MM-DD) or after any future revocation date.

This warning appears because the .apk is signed without a timestamp. A timestamp is not required for Android. The debug certificate validity period is very long; its expiration should not be a problem.