Found that fuse adapter doesn't work due to adapters packaging changes. JIRA is here: https://issues.jboss.org/browse/KEYCLOAK-2816

Among some minor things, the biggest issue is that osgi doesn't work properly if there are 2 modules with classes inside same package. There is "adapter-spi" and "adapter-spi-public" modules with both having classes inside package "org.keycloak.adapters.spi". So the easiest solution was just to rename the package.

There was possibility to rename either:
(1) the one inside "adapter-spi"
(2) or the one inside "adapter-spi-public" .

I've actually chose the (1) and renamed the one inside "adapter-spi" to "org.keycloak.adapters.spi .internal". Only reason is that there might be some users, who are using classes AuthenticationError or LogoutError, so they don't need to change the code of their applications because upgrade. On the other hand the (2) (rename the package inside "adapter-spi-public" to "org.keycloak.adapters.spi.public" and keep the one inside "adapter-spi" unrenamed) have the advantage of better consistency among module names and package names. So if you rather want me to go this way, let me know and I can change it.

For now, the PR against 1.9.x for path1 is here: https://github.com/keycloak/keycloak/pull/2614 . There are 72 affected files because of package renamed, but all of them are inside adapters. Will send PR against master too if you agree with the path1. Not sure if we rather need to retest all the examples because of the change... :-(

Marek