Hi, I am trying with this for a long time but could not figure out the problem. My web application has to log to a log file but we want different category tags to be assigned to the logs from specific packages, although all log will go to the same physical log file. I create one appender per category with the required tag included in the encoder pattern. I have crated a filter per appender so it will only take the logs for that category and reject all other logs.Then I map the parent package of my web application source code with all the appenders that I have created for each category. I know this sounds complicated please bear with me. The category mapping I get in the logging is fine and as expected but I am facing other unexpected issue of files rolling over. I am using daily rollover policy. File gets rolled over properly but the current log file contains a copy of logs from archived file with new logs appended to it. I don't understand why it happens. I use o.9.20 version of logback. File rollover used to work fine before I categorized the log and when all the logs simply used to go to the same file without any category tagging associated. Please suggest what could be going wrong if you can think of some thing. Thanks in advance. My logback.xml looks like: <!-- appender for category LPR --> <appender name="LOGFILE-LPR" class="ch.qos.logback.core.rolling.RollingFileAppender"> <filter class="abc.log.LogFilterFacilityLPR"/> <file>${log.dir}.log</file> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <!-- daily rollover --> <fileNamePattern>${log.dir}.%d{yyyy-MM-dd}.log</fileNamePattern> <!-- keep 30 days' worth of history --> <maxHistory>30</maxHistory> </rollingPolicy> <encoder> <pattern>%date{MM/dd HH:mm:ss} [%mdc{WEBAPP}] LPR %-5level %logger{25}:%L - %msg %n %ex{full}</pattern> </encoder> </appender> <!-- appender for category USER --> <appender name="LOGFILE-USER" class="ch.qos.logback.core.rolling.RollingFileAppender"> <filter class="abc.log.LogFilterFacilityUSER"/> <file>${log.dir}.log</file> <rollingPolicy class="ch.qos.logback.core.rolling.TimeBasedRollingPolicy"> <!-- daily rollover --> <fileNamePattern>${log.dir}.%d{yyyy-MM-dd}.log</fileNamePattern> <!-- keep 30 days' worth of history --> <maxHistory>30</maxHistory> </rollingPolicy> <encoder> <pattern>%date{MM/dd HH:mm:ss} [%mdc{WEBAPP}] USER %-5level %logger{25}:%L - %msg %n %ex{full}</pattern> </encoder> </appender> . . . . <!-- logger for parent package --> <logger additivity="false" name="org.akaza.openclinica"> <level value="${logLevel}" /> <appender-ref ref="LOGFILE-OTHER"/> <appender-ref ref="LOGFILE-LPR"/> <appender-ref ref="LOGFILE-USER"/> <appender-ref ref="LOGFILE-MAIL"/> <appender-ref ref="LOGFILE-AUTH"/> <appender-ref ref="LOGFILE-UUCP"/> <appender-ref ref="LOGFILE-AUTHPRIV"/> </logger>