https://access.redhat.com/webassets/avalon/d/red_hat_build_of_keycloak-26/javadocs/org/keycloak/userprofile/validator/ReadOnlyAttributeUnchangedValidator.html
ReadOnlyAttributeUnchangedValidator (Keycloak Docs Distribution 26.0.17.redhat-00001 API)
declaration: package: org.keycloak.userprofile.validator, class: ReadOnlyAttributeUnchangedValidator
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