Re: Initializing log4j using a servlet question ..

[Mufaddal Khumri <mu...@wmotion.com>]

Hi,

Thanks. Yes I found the same out yesterday.
log4j.appender.A1.file=${log.home}/cw.log was what was missing. I have
log.home pointing to /Tomcat/webapps/mywebapp/WEB-INF/log/

Now the other problem is about redirecting the exceptions like
NullPointerExceptions etc that get written to Tomcat/logs/catalina.out to
the ${log.home}/cw.log file. Is there a way to make Tomcat log all
exceptions resulting due to mywebapp to ${log.home}/cw.log??

Do I have to do something regarding this in the Tomcat server.xml file?

Following is an extract from the server.xml file. I have set the
swallowOutput = true for the Context of my webapp, but I do not know how
to redirect output to the ${log.home}/cw.log file (where log.home =
/Tomcat/webapps/mywebapp/WEB-INF/log/)

....
....
<Context path="/mywebapp" docBase="mywebapp" debug="0"
          swallowOutput="true"
          reloadable="true" crossContext="false">
    <Logger className="org.apache.catalina.logger.FileLogger"
     directory="webapps/mywebapp/WEB-INF/log"  prefix="cw" suffix=".log"
     timestamp="false"/>
</Context>
....
....

This logs in a file cw2004-10-30.log. But I want to log in the cw.log
file. Any tips as to how I could accomplish this?

Thanks.

> The appender is writing to a file that is located in the same directory
> that the VM started.  How did you start Tomcat?  If from one of the
> scripts  in the CATALINA_HOME/bin directory, then that's where you log
> file will  exist.  If you started it as a service (and didn't do any
> special  configuration to reset the location where the JVM starts), then
> (and I'm  assuming Windows NT, 2k, or XP here) it will likely exist in
> c:\winnt\system32.
>
> If you want the appender to write the file to your configured location,
> then prefix the filename with the name of the system property you are
> setting, such as...
>
> log4j.appender.A1.file=${log.home}/cw.log
>
> I know this works in the XML config file.  I'm not 100% sure properly
> substitution works in properties files, mostly because I never use
> them.  But I would think this should work.
>
> Jake
>
> At 04:45 PM 10/29/2004 -0700, you wrote:
>  >Hi,
>  >
>  >I am trying to use this under Tomcat 5.0.27.
>  >
>  >I have the following log4j.properties file under WEB-INF/conf/
>  ># initialise root logger with level DEBUG and call it A1
>  >log4j.rootLogger=DEBUG, A1
>  ># set the appender to be FileAppender
>  >log4j.appender.A1=org.apache.log4j.FileAppender
>  >log4j.appender.A1.file=cw.log
>  ># set set that layout to be SimpleLayout
>  >log4j.appender.A1.layout=org.apache.log4j.SimpleLayout
>  >
>  >I have the following in my web.xml
>  >     <servlet>
>  >               <servlet-name>Log4jInitServlet</servlet-name>
>  >
> <servlet-class>com.somepackage.Log4jInitServlet</servlet-class>
>  >               <load-on-startup>1</load-on-startup>
>  >               <init-param>
>  >               <param-name>log4j-configuration</param-name>
>  >                       <param-value>conf/log4j.properties</param-value>
>  >           </init-param>
>  >           <init-param>
>  >                <param-name>log4j-log-path</param-name>
>  >                <param-value>WEB-INF/log</param-value>
>  >               </init-param>
>  >       </servlet>
>  >
>  >
>  >I do the following in my Log4jInitServlet:
>  >
>  >...
>  >String baseDir = getServletContext().getRealPath( "/" );
>  >String logPath = config.getInitParameter(log4j-log-path);
>  >logPath = baseDir + logPath;
>  >File logPathDir = new File( logPath );
>  >System.setProperty( "log.home", logPath );
>  >PropertyConfigurator.configureAndWatch( confFile );
>  >...
>  >
>  >When I start my tomcat engine, I do not get any exceptions but my log
> file does not get created? Am I missing something in my
>  >log4j.properties file while specifying log4j.appender.A1.file ? or
> something else? I do not get any exceptions in catalina.out.
>  >
>  >I am trying to understand if this problem is due to my configuration
> of Tomcat or the configuration of my logger?
>  >
>  >Mufaddal Khumri
>  >
>  >
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