Hello, I'd like to change Hibernate logging level to WARN. As explained on this page<http://docs.jboss.org/hibernate/core/3.5/reference/en/html/session-configuration.html#configuration-logging>, you have to change the Hibernate Log Category "org.hibernate" to "WARN". It works perfectly with log4j when I add "log4j.logger.org.hibernate=WARN" to log4j.properties file. But when I change slf4j dependency to use logback instead of log4j and when I use the following logback.xml file, it doesn't work, I have Hibernate debug logs. Could you help me, please ? <configuration> <appender name="STDOUT" class="ch.qos.logback.core.ConsoleAppender"> <layout class="ch.qos.logback.classic.PatternLayout"> <Pattern>%d{HH:mm:ss.SSS} [%thread] %-5level %logger{36} - %msg%n</Pattern> </layout> </appender> <logger name="org.hibernate"> <level value="WARN"/> </logger> <root level="DEBUG"> <appender-ref ref="STDOUT"/> </root> </configuration> Thanks. Olivier