Hello, For some operation in our software, we need to perform some REST operations on keycloak (mainly set some client role in response to some business logic). For that we use the provided java rest client. However, we noticed in the past that if the client and server don't run the exact same version, you start getting exceptions on the client side. It was due to server replying with additional parameters in the json, and the client throwing Exception on parsing those unattended additional properties. I think I was running at that time client 2.3 on a 2.5 server. It seems like the api used to generate java client has a parameter to be more relax on unexpected properties, but it has been generated by requesting a strict adherence to expected reply. Is it expected behavior that java client crash if server is not at the same version? That doesn't seem very practical from a production point of view, if you need to upgrade your keycloak server, you then need to sync with applications upgrade schedule. -- <http://www.trimble.com/> David Delbecq Software engineer, Transport & Logistics Geldenaaksebaan 329, 1st floor | 3001 Leuven +32 16 391 121 <+32%2016%20391%20121> Direct david.delbecq(a)trimbletl.com <http://www.trimbletl.com/>