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From Jacob Kjome <h...@visi.com>
Subject Re: WIN2K and Linux, not same behavior on Rolling File Appender in Servlets
Date Sat, 20 Dec 2003 19:58:27 GMT

The behavior you see on Win2k is to be expected assuming that the JVM was 
started from the location "G:\jakarta-tomcat-5.0.16".  If you provide a 
relative path for the log file, the path will be relative to wherever the 
JVM started.  If you want the file to go somewhere specific on your system 
and not be relative to where the JVM was started, then provide a fully 
qualified path.

I'm not sure about the behavior on Linux.  Are you sure that the user which 
started Tomcat has sufficient rights to write the log file?  Note that it 
is up to you to make sure that the directory that you are writing log files 
to actually exists.  Log4j won't create them for you and you would get 
exactly this behavior.  Note also that the location from where the JVM 
started on Linux might be different than on Windows.

I would suggest creating an environment variable which is referenced in 
your log4j.properties file which you can set when start the JVM for 
Tomcat.  This will make it so you can provide a fully qualified path to the 
directory to write log files and not have to change your properties file 
when going between Windows and Linux.  Eg....
         log4j.appender.LOGFILE.File=${log4j.log.home}/ftp.log

Then run Tomcat with something like this...
         run_tomcat.sh -Dlog4j.log.home=/valid/path/to/an/existing/directory


Jake

At 05:43 PM 12/19/2003 -0800, you wrote:
>I had a demo this week using a WAR file that i deployed many times on
>Windows with great results. This week using the same WAR file on Linux for
>the first time, EVERY LOGGER Call threw an exception   $%^#&  not my best
>week for demos.
>
>some hypothesis follows and i would greatly appreciate expert guidance on
>this...
>
>
>Note that jar "log4j-1.2.8.jar" contains PropertyConfigurator.class and that
>this jar is in the  following 2 WebApp directories under Tomcat/BASE...
>NOTE ALSO that NONE of the Tomcat Common, shared, endorsed libs contain
>log4j-1.2.8.jar.
>
>#1
>r@robert1 /cygdrive/g/jakarta-tomcat-5.0.16
>$ find -name log4j-1.2.8.jar
>./webapps/axis/WEB-INF/lib/log4j-1.2.8.jar
>./webapps/ftp-examples/WEB-INF/lib/log4j-1.2.8.jar
>
>---------------------
>static code for log4j configuration that i use in every class...
>
>#2
>  static
>     {
>         log = Logger.getLogger((this.class).getName());
>         PropertyConfigurator.configure(
>                 this.class.getClassLoader()
>                         .getResource(
>                                 "config/log4j.properties"
>                         )
>         );
>     }
>
>
>----- log4j.properties file (elided) -----
>#3
># LOGFILE is set to be a File appender using a PatternLayout.
>#log4j.appender.LOGFILE=org.apache.log4j.FileAppender
>log4j.appender.LOGFILE=org.apache.log4j.RollingFileAppender
>log4j.appender.LOGFILE.File=logs/ftp.log                <-- linux 
>exception on this
>                                                         <-- "File does 
> NOT EXIST"
>
>
>-----  Behavior of War deployed on Windows...
>
>NOTE that the code at #2 operates in a Web app. and will load
>PropertyConfigurator class from the jar located at that webapp's context (
>webapps/this.context/WEB-INF/lib/log4j-1.2.8.jar ).
>
>However, in Windows, the crazy feature is that the fileAppender from #3 gets
>written NOT at the Webapp's context , but a Tomcat's BASE as in
>"G:\jakarta-tomcat-5.0.16\logs". This seem's impossible to me??
>
>-------  Behavior of War deployed on Linux...
>
>every log.debug() call throws a "file does not exist" ( logs/ftp.log )
>exception. Why is this? Like on Windows example above, here the Linux path
>"jakarta-tomcat-5.0.16/logs" exists but the system never writes the appender
>there.
>
>Its as if on Linux, the only place it will try to write the appender is to:
>    webapps/this.context/logs/ftp.log and since there is no "logs" directory
>under each
>web context, the error is thrown...
>
>Since the WAR file does not define a path under every WEBAPP that includes
>"this.context/logs" , all the logger calls throw exceptions...
>
>
>
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