Hi, I'm using logback core and classic(both version are 0.9.9) with jdk5.0. My goal is to generate a log file per log level.Namely error.log is for error level and warn.log is for warn level and so on. I found the following thread though, http://marc.info/?l=logback-user&m=125052059800553&w=2 I could not create the LevelBasedDiscriminator class because I could not find the classes below on logback 0.9.9. ch.qos.logback.classic.sift.SiftingAppender ch.qos.logback.core.sift.Discriminator ch.qos.logback.classic.spi.ILoggingEvent I have two questions. Q1.Is it possible to create log files per log level? Q2.If I have to give up the use of SiftingAppender,how can I accomplish my goal? -------------------------------------- Learn more about breast cancer - Pink Ribbon Campaign 2010 http://yj.pn/JAy9L7