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Date: Wed, 20 May 2009 12:10:48 -0700 (PDT)
From: power97 <cjob68@shaw.ca>
To: log4j-user@logging.apache.org
Subject: RE: Dynamic File Name and Turn off File Logging
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It didn't work. Any ideas , here is my code:

Windows .cmd file:
set LOG4J_NULL=nul

log4j.properties file
log4j.appender.LOGFILE.File=${LOG4J_NULL}


Douglas E Wegscheid wrote:
> 
> if you set -DLOG4J_NULL=/dev/null in the unix shell script, and set 
> -DLOG4J_NULL=nul in the Windows command file, then you can just say:
> 
> log4j.appender.R.File=${LOG4J_NULL}
> 
> in your log4j.properties, and it will work in both cases (assuming you use 
> the correct appender name, and not the one I just wrote!). See the top of 
> the javadocs for PropertyConfigurator.
> 
> Property substitution is also supported in the DomConfigurator, see 
> http://mail-archives.apache.org/mod_mbox/logging-log4j-dev/200105.mbox/%3C5.0.2.1.0.20010506010420.01cabb58@mail.qos.ch%3E
> for a good example.
> 
> Douglas E Wegscheid
> Lead Technical Analyst, Whirlpool Corporation
> (269)-923-5278
> 
> "A wrong note played hesitatingly is a wrong note. A wrong note played 
> with conviction is interpretation."
> 
> 
> 
> 
> 
> power97 <cjob68@shaw.ca> 
> 05/20/2009 11:11 AM
> Please respond to
> "Log4J Users List" <log4j-user@logging.apache.org>
> 
> 
> To
> log4j-user@logging.apache.org
> cc
> 
> Subject
> RE: Dynamic File Name and Turn off File Logging
> 
> 
> 
> 
> 
> 
> 
> I'm setting it right in the log4j.properties file. I'm thinking it won't 
> be a
> big deal to just move the log4j outside the JAR file and change it when on
> Unix. 
> 
> Even if I set the value in batch script on windows and unix I still have 
> to
> manually set the values so setting it in the log4j.properties maybe isn't
> anymore work. 
> 
> 
> 
> Douglas E Wegscheid wrote:
>> 
>> how are you setting it now? inside your program, or in the 
> configuration?
>> 
>> you have a number of options: programmatically you can determine what OS 
> 
>> you are on and set it accordingly. You can set it appropriately as a 
>> system property from whatever script or batch file you are invoking the 
>> program from ( set -DLOG4J_NULL=/dev/null and the ${LOG4J_NULL} in your 
>> config.
>> 
>> options limited by imagination...
>> 
>> Douglas E Wegscheid
>> Lead Technical Analyst, Whirlpool Corporation
>> (269)-923-5278
>> 
>> "A wrong note played hesitatingly is a wrong note. A wrong note played 
>> with conviction is interpretation."
>> 
>> 
>> 
>> 
>> 
>> power97 <cjob68@shaw.ca> 
>> 05/20/2009 10:25 AM
>> Please respond to
>> "Log4J Users List" <log4j-user@logging.apache.org>
>> 
>> 
>> To
>> log4j-user@logging.apache.org
>> cc
>> 
>> Subject
>> RE: Dynamic File Name and Turn off File Logging
>> 
>> 
>> 
>> 
>> 
>> 
>> 
>> How do I do that ? It does need to run on Windows and Unix. 
>> 
>> 
>> 
>> Michael Erskine wrote:
>>> 
>>>> This works fine in Windows
>>>> but when run on Unix it actually creates a file called "nul".
>>> 
>>> That's because what you're doing is Windows specific. Fix that if you 
>> need
>>> a cross-platform configuration.
>>> 
>>> Regards,
>>> Michael Erskine
>>> 
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>> 
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