Re: log4j.properties gets loaded twice causing rollling to fail
Hi Could I trouble you to explain further why putting the application log4j.properties in WEB-INF/classes, as opposed to WEB-INF/classes/properties, would prevent the webapp classloader from seeing the tomcat's log4j.properties? Gerald On 11 Jul, 2014, at 11:27 pm, Jacob Kjome h...@visi.com wrote: Why don't you place your webapp's log4j.properties file in WEB-INF/classes instead of WEB-INF/classes/properties? That way, the webapp classloader won't ever see the tomcat log4j.properties, thus no rolling file appender conflicts. Jake On Fri, 11 Jul 2014 11:16:41 +0800 guowei gerald...@yahoo.com.sg wrote: Dear all, I am using log4j for tomcat internal logging and also application logging. I followed Tomcat's instruction to configure log4j rolling and I also have configured my application to have its own log4j rolling. log4j.jar is in both Tomcat's lib and web application's lib, each have their respective log4j.properties I enabled -Dlog4j.debug and I can see the sequence of the events 1) log4j.properties for the tomcat gets loaded by Tomcat's StandardClassLoader 2) the same log4j.properties for tomcat gets loaded by the Tomcat's WebappClassLoader 3) application's log4j.properties is loaded Between 1) and 2) I can see the tomcat files being rolled ( I intentionally set DailyRollingAppender to -MM-dd-HH-mm and DEBUG level to make sure lots of things gets logged). Rolling was working well. Files were rolled on the minute However, when step 2) kicks in, the rolling of tomcat files failed. I reckon that the moment the the same log4j.properties is loaded, there is a conflict since the same appenders are referred twice. I am not certain has it anything to do with the tomcat's log4j configuration or appliation's log4j configuration. The Application's log files are rolled correctly. Would appreciate if anyone can enlighten me. -Dlog4j.debug output log4j: Trying to find [log4j.xml] using context classloader org.apache.catalina.loader.StandardClassLoader@1529d183. log4j: Trying to find [log4j.xml] using org.apache.catalina.loader.StandardClassLoader@1529d183 class loader. log4j: Trying to find [log4j.xml] using ClassLoader.getSystemResource(). log4j: Trying to find [log4j.properties] using context classloader org.apache.catalina.loader.StandardClassLoader@1529d183. log4j: Using URL [file:/C:\Apache\Tomcat/lib/log4j.properties] for automatic log4j configuration. log4j: Reading configuration from URL file:/C:\Apache\Tomcat/lib/log4j.properties log4j: Parsing for [root] with value=[WARN,CATALINA,LOCALHOST,MANAGER,HOST-MANAGER,stdout,stderr]. log4j: Level token is [WARN]. log4j: Category root set to WARN log4j: Parsing appender named CATALINA. log4j: Parsing layout options for CATALINA. log4j: Setting property [conversionPattern] to [%d [%t] %-5p %c- %m%n]. log4j: End of parsing for CATALINA. log4j: Setting property [encoding] to [UTF-8]. log4j: Setting property [datePattern] to ['.'-MM-dd-HH-mm'.log']. log4j: Setting property [file] to [C:\Apache\Tomcat/logs/catalina]. log4j: Setting property [append] to [true]. log4j: setFile called: C:\Apache\Tomcat/logs/catalina, true log4j: setFile ended log4j: Appender [CATALINA] to be rolled on top of every minute. log4j: Parsed CATALINA options. log4j: Handling log4j.additivity.org.apache.catalina.core.ContainerBase.[Catalina].[localhost]=[null] log4j: Finished configuring. . . #Parsing for rest of the file . . log4j: Parsing for [org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[host-manager]] with value=[WARN, HOST-MANAGER]. log4j: Level token is [WARN]. log4j: Category org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[host-manager] set to WARN log4j: Parsing appender named HOST-MANAGER. delegate: false repositories: /WEB-INF/classes/ -- Parent Classloader: org.apache.catalina.loader.StandardClassLoader@6c79fa4f . log4j: Trying to find [log4j.xml] using WebappClassLoader context: /mya delegate: false repositories: /WEB-INF/classes/ -- Parent Classloader: org.apache.catalina.loader.StandardClassLoader@6c79fa4f class loader. log4j: Trying to find [log4j.xml] using ClassLoader.getSystemResource(). log4j: Trying to find [log4j.properties] using context classloader WebappClassLoader context: /mya delegate: false repositories: /WEB-INF/classes/ -- Parent Classloader: org.apache.catalina.loader.StandardClassLoader@6c79fa4f . log4j: Using URL [file://C:\Apache\Tomcat/lib/log4j.properties] for automatic log4j configuration. log4j: Using URL [file:/C:\Apache\Tomcat/lib/log4j.properties] for automatic log4j configuration. log4j: log4j: Parsing for [root] with value=[WARN,CATALINA,LOCALHOST,MANAGER,HOST-MANAGER,stdout,stderr]. log4j: Level token is [WARN]. Reading configuration from URL file:/C:\Apache\Tomcat/lib/log4j.properties log4j: Category root
Re: log4j.properties gets loaded twice causing rollling to fail
Because Log4j, by default, looks for config files in the default package. Furthermore, because of Tomcat's child-first classloading behavior, if you place log4j.properties in the default package of the webapp (WEB-INF/classes) it won't bother looking in the parent classloader since it will have already found the config file in the webapp classloader. Note, however, that log4j.xml takes precedence over log4j.properties. So, if you have log4j.xml in Tomcat's classpath (in the default package), then even if you have log4j.properties in the webapp classpath, it will use log4j.xml from the server classpath. If that case, you'd need log4j.xml in the webapp's default package to override the server's log4j.xml. Just thought I'd point that out. Jake On Sun, 13 Jul 2014 00:04:26 +0800 Gerald gerald...@yahoo.com.sg wrote: Hi Could I trouble you to explain further why putting the application log4j.properties in WEB-INF/classes, as opposed to WEB-INF/classes/properties, would prevent the webapp classloader from seeing the tomcat's log4j.properties? Gerald On 11 Jul, 2014, at 11:27 pm, Jacob Kjome h...@visi.com wrote: Why don't you place your webapp's log4j.properties file in WEB-INF/classes instead of WEB-INF/classes/properties? That way, the webapp classloader won't ever see the tomcat log4j.properties, thus no rolling file appender conflicts. Jake On Fri, 11 Jul 2014 11:16:41 +0800 guowei gerald...@yahoo.com.sg wrote: Dear all, I am using log4j for tomcat internal logging and also application logging. I followed Tomcat's instruction to configure log4j rolling and I also have configured my application to have its own log4j rolling. log4j.jar is in both Tomcat's lib and web application's lib, each have their respective log4j.properties I enabled -Dlog4j.debug and I can see the sequence of the events 1) log4j.properties for the tomcat gets loaded by Tomcat's StandardClassLoader 2) the same log4j.properties for tomcat gets loaded by the Tomcat's WebappClassLoader 3) application's log4j.properties is loaded Between 1) and 2) I can see the tomcat files being rolled ( I intentionally set DailyRollingAppender to -MM-dd-HH-mm and DEBUG level to make sure lots of things gets logged). Rolling was working well. Files were rolled on the minute However, when step 2) kicks in, the rolling of tomcat files failed. I reckon that the moment the the same log4j.properties is loaded, there is a conflict since the same appenders are referred twice. I am not certain has it anything to do with the tomcat's log4j configuration or appliation's log4j configuration. The Application's log files are rolled correctly. Would appreciate if anyone can enlighten me. -Dlog4j.debug output log4j: Trying to find [log4j.xml] using context classloader org.apache.catalina.loader.StandardClassLoader@1529d183. log4j: Trying to find [log4j.xml] using org.apache.catalina.loader.StandardClassLoader@1529d183 class loader. log4j: Trying to find [log4j.xml] using ClassLoader.getSystemResource(). log4j: Trying to find [log4j.properties] using context classloader org.apache.catalina.loader.StandardClassLoader@1529d183. log4j: Using URL [file:/C:\Apache\Tomcat/lib/log4j.properties] for automatic log4j configuration. log4j: Reading configuration from URL file:/C:\Apache\Tomcat/lib/log4j.properties log4j: Parsing for [root] with value=[WARN,CATALINA,LOCALHOST,MANAGER,HOST-MANAGER,stdout,stderr]. log4j: Level token is [WARN]. log4j: Category root set to WARN log4j: Parsing appender named CATALINA. log4j: Parsing layout options for CATALINA. log4j: Setting property [conversionPattern] to [%d [%t] %-5p %c- %m%n]. log4j: End of parsing for CATALINA. log4j: Setting property [encoding] to [UTF-8]. log4j: Setting property [datePattern] to ['.'-MM-dd-HH-mm'.log']. log4j: Setting property [file] to [C:\Apache\Tomcat/logs/catalina]. log4j: Setting property [append] to [true]. log4j: setFile called: C:\Apache\Tomcat/logs/catalina, true log4j: setFile ended log4j: Appender [CATALINA] to be rolled on top of every minute. log4j: Parsed CATALINA options. log4j: Handling log4j.additivity.org.apache.catalina.core.ContainerBase.[Catalina].[localhost]=[null] log4j: Finished configuring. . . #Parsing for rest of the file . . log4j: Parsing for [org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[host-manager]] with value=[WARN, HOST-MANAGER]. log4j: Level token is [WARN]. log4j: Category org.apache.catalina.core.ContainerBase.[Catalina].[localhost].[host-manager] set to WARN log4j: Parsing appender named HOST-MANAGER. delegate: false repositories: /WEB-INF/classes/ -- Parent Classloader: org.apache.catalina.loader.StandardClassLoader@6c79fa4f . log4j: Trying to find [log4j.xml] using WebappClassLoader context: /mya delegate: false repositories: /WEB-INF/classes/ -- Parent Classloader: org.apache.catalina.loader.StandardClassLoader@6c79fa4f class loader.
