With a few lines of code you can expose a custom principal and fetch entitlements from whatever store you like.
External libraries become obsolete and your WAR stays leaner:
[See also an in-depth discussion in the "Real World Java EE Patterns--Rethinking Best Practices" book (Second Iteration, "Green Book"), page 161 (Sample "Principal Enricher") in, chapter "Re-Injector"]
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See you at Java EE Workshops at MUC Airport, particularly at the Effective JavaEE workshop!
NEW MUC Airport Workshop: Migrating Java Client (Swing / Java FX) to Web Standards
Airport MUC workshops: Web (SPA, PWAs, Offline, Desktop, Mobile) Applications Essentials and Effective Web Applications. No migrations. #usetheplatform
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A book about rethinking Java EE Patterns