Blogs principal-transformer
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.