@Override
    public String resolveUsernameInternal(final RegisteredServiceUsernameProviderContext context) {
        return SpringExpressionLanguageValueResolver.getInstance().resolve(this.value);
    }
Returns a static value for the username attribute.

@author Misagh Moayyed
@since 7.0.0
core/cas-server-core-services-api/src/main/java/org/apereo/cas/services/StaticRegisteredServiceUsernameProvider.java