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We had introduced additional abstract class to add token expiry awareness in last release. This made it 3 levels of abstract classes.
After looking into it closely, I think probably it's a good idea to make token expiry aware a default behaviour - as this is useful in all the cases except plain token based secret.
About duplication of token expiry checking logic in JCasC and Credentials - I think this needs a bigger refactoring. We should extract Vault Authentication mechanism in a common place and it should be used by both credentials and JCasC secrets code.