[keycloak-user] Admin CLI - how to a a builtin protocol Mapper to a Client

[Bruce Smith]

Hi

I am trying to add the built-in protocol mapper "realm roles" to a client
using the Admin CLI. I must have tried 500 syntactic combinations for the
"--set" parameter; they all result in either no error (but no mapper added
to the client), or a Java exception
(com.fasterxml.jackson.databind.exc.MismatchedInputException: Cannot
deserialize instance of `java.util.ArrayList` out of VALUE_STRING token).

Does anyone have an example that can be shared of successfully using the
Admin CLI for this operation, please?

Keycloak version is 6.0.1

Regards
Bruce