When upgrading to 16.0, the install script gives a warning for the JDK version for the Java included in the install (jdk-11.0.11+9)
Expanding: $clarity_install_media_16/thirdparty.libs.16.0.0.jar into $clarity_install_media_16/tplibsdir
Current version: 184.108.40.2060
Upgrading to: 220.127.116.110
Trying to override old definition of task java
CA PPM upgrade from 15.9.2 to 16.0.0 detected.
J2SDK 1.6.0 (or higher) Home Directory [/opt/apps/jdk-11.0.11+9] :
Warning: Invalid JDK directory.
Keep this value and continue? [(y)es, (n)o]
Release : 16.0.0
Component : Clarity Install and Upgrade
Fixed in 16.0.1 as DE63068
Alternatively, you can just ignore the warning and continue with the install with the current, correct JDK value for JDK 11. The upgrade will not be affected.