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I get this error "log4j:ERROR Failed to rename" in my tomcat server log. I have multiple DailyRollingFileAppender in my log4j XML. And each appender points to different file. Only once instance of the application is running. I used Handle utility and run the command (with log file name as parameter) handle -f ams-app.log and the result is Tomcat7.exe pid: 5032 type: File 54C: E:\apps\ams\logs\ams-app.log From this I assume there is only one lock on the file. My environment Windows Server 2008, tomcat 7.0 and Java 6 and slf4j-log4j12(1.5.6) This problem was not happening when same application hosted on AIX server. I googled this problem and it seems to be windows specfic. Also I am not keen to use DatedFileAppenders or any forked log4j. Does logback solve such issues. Any suggestions on how to solve this problem is appreciated. Thanks here my log4j xml <log4j:configuration xmlns:log4j="http://jakarta.apache.org/log4j/"> <appender name="CONSOLE_APPENDER" class="org.apache.log4j.ConsoleAppender"> <errorHandler class="org.apache.log4j.helpers.OnlyOnceErrorHandler"/> <param name="Target" value="System.out"/> <param name="Threshold" value="DEBUG"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%n %d{yyyy/MM/dd HH:mm:ss} %-5p %x %M(%F:%L) - %m %n"/> </layout> </appender> <appender name="APP_APPENDER" class="org.apache.log4j.DailyRollingFileAppender"> <errorHandler class="org.apache.log4j.helpers.OnlyOnceErrorHandler"/> <param name="datePattern" value="yyyy-MM-dd"/> <param name="file" value="E:/apps/ams/logs/ams-app.log"/> <param name="append" value="true"/> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%n %d{yyyy/MM/dd HH:mm:ss} %-5p %x %M(%F:%L) - %m %n"/> </layout

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