Full stacktrace is printed in logs within a WARN message when "Remember Me" cookie is not valid

• Type: Bug
• Status: Closed
• Resolution: Fixed
• Affects Version/s: 7.3.X, Master
• Fix Version/s: 7.3.7 CE GA8, 7.3.10 DXP FP2, 7.3.X, 7.4.0 CE GA1, 7.4.13 DXP GA1, Master
• Component/s: Application Security > Auto Login
• Labels:
  • ee-ts
  • liferay-fixpack-dxp-2-7310
• Branch Version/s:
  7.3.x
• Backported to Branch:
  Committed
• Story Points: 1
• Fix Priority: 3
• Git Pull Request: https://github.com/liferay-appsec/liferay-portal/pull/292

The full stacktrace is printed when a WARN message is logged because of a BadPadding exceptions when trying to retrieve old "Remember Me" cookies. This causes in some occasions that:

• Logs from customers who have upgraded their servers grow considerably, making them unusable.
• They worry too much about a WARN message that has no consequences. If the user logs in again the cookie will be updated and the message will no longer appear.

Steps to reproduce:

1. Start a 6.2 server in http://localhost:6200.
2. Log in with 'Test' user and check the 'Remember Me' checkbox.
3. Start a master server in http://localhost:8080.
4. Using the same browser as in step 2, navigate to http://localhost:8080.
5. Check the logs.

Current result (see logs attached):

• An ERROR from AutoLogin filter is logged with no stacktrace.
• A WARN from RememberMeAutoLogin is logged, including a full stacktrace exception.

Expected result:

• An ERROR from AutoLogin filter is logged with no stacktrace.
• A DEBUG full stacktrace from RememberMeAutoLogin is logged if debug traces are enabled.