[keycloak-user] How to create a Validation Flow to Registration Form using Authentication SPI?

Hi all, Need help please. I'm trying to create a validation class to add some rules when a user try to do a registration (just to validate the username). So, I saw this link: https://keycloak.gitbooks.io/documentation/server_development/topics/auth... and this project: https://github.com/keycloak/keycloak/tree/master/examples/providers/authe... But I still have some questions to know how could I create my own validation form in the register.ftl So, My question is: Should I create just one class as the example of "org.keycloak.authentication.forms.RegistrationProfile"? Here is the example below: *file:* br.gov.pe.sso.keycloak.forms.UsernameFormRegistrationProfile.java package br.gov.pe.sso.keycloak.forms; and finally *file:* META-INF/services/org.keycloak.authentication.FormActionFactory br.gov.pe.sso.keycloak.forms.UsernameFormRegistrationProfile So, for now, I just need to create my own jar and add into a specific folder. is that right? Or should I need to add into keycloak projeto and then re-generate the war project? Would be possible to extends the RegistrationProfile class? I'm sorry for that bunch of questions :) Thanks a lot! Best regards -- --- *Celso Agra*