How to make accessing user information simpler, with new support for custom principals in WildFly Elytron.
An overview of the new case principal transformer included in WildFly 22.
This blog post shows how to use a principal-transformer in an aggregate-realm between authentication and authorization.
How to implement and make use of a custom Elytron principal transformer.
To control the behaviour during authentication and authorization WildFly Elytron supports the use of various transformers, mappers, and decoders - this blog post describes how they fit together in the different stages of authentication.