The IBM JDK is the default used with Liberty profile. You do not need to change the manifest.yml file or configure anything else to use the IBM JDK. The behavior is the same as setting the JVM
environment variable to ibmjdk
. For example, using the manifest.yml file:
---
env:
JVM: ibmjdk
If you would prefer to use the Open JDK then please read Open JDK.