1/ Deploying minimum 3 applications on the default server instance of a jboss 5.1.0.GA domain. Theses 3 applications must use log4. They should trace a message logging with the simple application name : myWebAppX.war 2/ Configuring and upgrade jboss-logging Edit the file jboss-log4.xml and add the following to separate the log of th 3 applications (myXWebApp1.war, myXWebApp2.war and myXWebApp3.war) from the default server log (server.log) <appender name="AppWebApp1" class="org.jboss.logging.appender.DailyRollingFileAppender"> <errorHandler class="org.jboss.logging.util.OnlyOnceErrorHandler"/> <param name="File" value="${jboss.server.log.dir}/admin-fonct-server.log"/> <param name="Append" value="false"/> <param name="DatePattern" value="'.'yyyy-MM-dd"/> <layout class="org.apache.log4j.PatternLayout"> <layout class="org.apache.log4j.PatternLayout"> <param name="ConversionPattern" value="%d %-5p [%c] %m%n"/> </ Layout> <filter class="org.apache.log4j.varia.LevelMatchFilter"> <param name="levelToMatch" value="INFO"/> </ Filter> <filter class="org.jboss.logging.filter.TCLMCFilter"> <param name="AcceptOnMatch" value="true"/> <param name="DeployURL" value="myWebApp1.war"/> </ Filter> <! - End the filter chain here -> <filter class="org.apache.log4j.varia.DenyAllFilter"/> </ Appender> <category name="com.company.dsi"> <appender-ref ref="App1Log"> </ appender-ref> <appender-ref ref="App2Log"> </ appender-ref> <appender-ref ref="App3Log"> </ appender-ref> </ Category> <category name="org.hibernate"> <appender-ref ref="App1Log"> </ appender-ref> <appender-ref ref="App2Log"> </ appender-ref> <appender-ref ref="App3Log"> </ appender-ref> </ Category> ... The same for the two others applications. Upgrading folowwing library from 2.1.0GA to 2.1.1.GA: jboss-logging-log4j.jar jboss-logging-jdk.jar jboss-logging-spi.jar Restart the default server. 3/ Editing the 3 log files and compare them : myXWebApp1.log , myXWebApp2.log and myXWebApp3.log. The log of the 3 application will be in the 3 files.