Fetch Logged In Username in a webapp secured with Keycloak

Question

I have secured an enterprise application with Keycloak using standard wildfly based Keycloak adapters. Issue that I am facing is that the rest web services when invoked, nee

Answer 1

Need to add standalone.xml next line:

preferred_username

Example:

    
        realm-name
        resource-name
        true
        https://keycloak-hostname/auth
        EXTERNAL
        preferred_username