I do not have 4.0.1, so I will answer based on 4.0.5 - hopefully they are not that different (yes, I know that this is a very bad assumption to make with the 4.0.x versions). Anyway, the default appender is the DailyRollingFileAppender which has no size limitation - it just increases is size until midnight and then a new log file is created. To limit the size, you could use the RollingFileAppender, it has a MaxFileSize parameter. Here is an example: <appender name="FILE" class="org.jboss.logging.appender.RollingFileAppender"> | <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/> | <param name="File" value="${jboss.server.log.dir}/server.log"/> | <param name="Append" value="true"/> | <param name="MaxFileSize" value="500KB"/> | <param name="MaxBackupIndex" value="20"/> | <layout class="org.apache.log4j.PatternLayout"> | <param name="ConversionPattern" value="%d %-5p [%c] %m%n"/> | </layout> | </appender> View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=4178936#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...