In the case of a web application (e.g. Tomcat app secured by the keycloak adapter) the web app might need to access details of the authenticated user (e.g. full name or email).
I've found that this information is available from the session like this:

KeycloakSecurityContext session = (KeycloakSecurityContext)request.getAttribute(KeycloakSecurityContext.class.getName());
IDToken idToken = session.getIdToken();
String email = idToken.getEmail();

One issue with this is that all your web apps are tied to keycloak.

Is this the right way to handle this?
Are there alternatives?

Tim