[keycloak-user] impossible to get logs from adapter-saml

Hi, I am updating an old struts 1.3 web app and integrating our SAML - SSO service with help of keycloak adapter for SAML. I am facing a problem (perhaps a silly problem): I am using Tomcat 7 and I try to get logs from the keycload saml adapter as said in: http://keycloak.github.io/docs/userguide/saml-client-adapter/html/debuggi... with "log4j.logger.org.keycloak.saml=DEBUG" in my log4j.properties. But there are no 'debug' info in the console. I have other debug info for my application bat none for keycloak adapter. I am doing something wrong? Thanls for the help.