I just discovered that log rotation fails on Windows if using ContextJNDISelector. I've tried both FixedWindowRollingPolicy and TimeBasedRollingPolicy with the same outcome. If I disable JNDI, I lose the contextName but rotation occurs as expected. Here's the error I get: 12:22:36,006 |-INFO in c.q.l.co.rolling.helper.RenameUtil - Renaming file [c:\telmast6\soft\apache-tomcat-6.0.24\logs\debug.log] to [c:\telmast6\soft\apache-tomcat-6.0.24\logs\debug1.log] 12:22:36,006 |-WARN in c.q.l.co.rolling.helper.RenameUtil - Failed to rename file [c:\telmast6\soft\apache-tomcat-6.0.24\logs\debug.log] to [c:\telmast6\soft\apache-tomcat-6.0.24\logs\debug1.log]. 12:22:36,006 |-WARN in c.q.l.co.rolling.helper.RenameUtil - Please consider leaving the [file] option of RollingFileAppender empty. 12:22:36,006 |-WARN in c.q.l.co.rolling.helper.RenameUtil - See also http://logback.qos.ch/codes.html#renamingError And here is my logback.xml file: <configuration scan="true" scanPeriod="30 seconds"> <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender"> <file>${catalina.home}/logs/debug.log</file> <rollingPolicy class="ch.qos.logback.core.rolling.FixedWindowRollingPolicy"> <fileNamePattern>${catalina.home}/logs/debug%i.log</fileNamePattern> <minIndex>1</minIndex> <maxIndex>5</maxIndex> </rollingPolicy> <triggeringPolicy class="ch.qos.logback.core.rolling.SizeBasedTriggeringPolicy"> <maxFileSize>25MB</maxFileSize> </triggeringPolicy> <encoder> <pattern>%d{MM/dd HH:mm:ss.SSS}|%thread|%X{sessionUserName}|%-5level|%X{debugLevel}|%logger{36}|%replace(%msg){'\n', '~~~'}|%contextName%n</pattern> </encoder> </appender> <root level="DEBUG"> <appender-ref ref="FILE" /> </root> </configuration> The logback and slf4j resources must be loaded by the servlet container classloader (multiple reasons) and this is also desirable as we want to funnel all logging into a single file however, we also need to know which application generated the call - er go our use of JNDI (MDC wouldn't work). By the way, this is a Windows-only issue. Works splendidly on Linux. Thanks. -- Scott Dudley Senior Developer Telesoft Corp. | 1661 E. Camelback Rd., Suite 300 | Phoenix, AZ, 85016