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From Tushar Kapila <tgkp...@gmail.com>
Subject Re: set the placeholder in the log4j.properties file
Date Thu, 30 Dec 2010 09:55:44 GMT
I think for most apps you would want all logs to go to file so you can
see start up exceptions. Only place you might not mind missing this is
when no app specific common code runs before this servlet inits.
So my advice is customize the log4j xml in file system per install.
That way all logs will be in file.

On 12/29/10, Jacob Kjome <hoju@visi.com> wrote:
> Log4j will attempt to auto-configure itself by looking for "log4j.xml" and
> then
> "log4j.properties" in the root of the claspath upon the first call to
> getLogger().
>  And yes, this may very well be before your init servlet runs.  Note that
> the new
> configuration (done manually in the init servlet) will have things
> configured as
> you want them.
>
> There is a solution.  You can set system properties....
>
> -Dapppath=/my/logging/directory
>
> And, optionally....
> -Dlog4j.configuration=file:///path/to/log4j.properties
>
>
> That said, you could just place a minimal config file in the classpath
> pointing
> all logging to the Console and then let your init servlet configure the
> preferred
> config file as you are doing.  I guess it all depends on how important it is
> for
> you to get all logging to your preferred file, even logging that occurs
> prior to
> your init servlet running.
>
>
> Jake
>
> On 12/27/2010 12:26 AM, maven apache wrote:
>> Hi:
>>
>> I want the logs created by log4j put under the app dir,so I set the
>> placeholder in the log4j.properties:
>>
>> # chartstdout is set to be a ConsoleAppender.
>> log4j.appender.chartstdout=org.apache.log4j.ConsoleAppender
>> log4j.appender.chartstdout.layout=org.apache.log4j.PatternLayout
>> log4j.appender.chartstdout.layout.ConversionPattern=%-4r [%t] %-5p %l %x -
>> %m%n
>>
>>
>> log4j.appender.chartfileout=org.apache.log4j.FileAppender
>> log4j.appender.chartfileout.File=${apppath}/logs/log.html
>> log4j.appender.chartfileout.Append=true
>> log4j.appender.chartfileout.layout=com.test.util.CustomHTMLLayout
>>
>> log4j.rootLogger=debug, chartstdout,chartfileout
>>
>> Then in my servlet whose "load-on-startup" attribute is "0" I set the
>> property "apppath",but it does not work.
>> It seems that the log4j read the log4j.properties and config the log
>> before
>> I modify the property.
>>     public void init() {
>>         DbManager.init();
>>         // log
>>         String context =
>> getServletConfig().getServletContext().getRealPath("/");
>>         Properties p = new Properties();
>>         p.setProperty("apppath", context);
>>         try {
>>
>> p.load(InitServlet.class.getResourceAsStream("/log4j.properties"));
>>         } catch (IOException e) {
>>             e.printStackTrace();
>>         }
>>         PropertyConfigurator.configure(p);
>>     }
>>
>>
>>
>> Of course,I can rename the log4j.properties,then the log4j will not find
>> the
>> file but I can. However some other libs which I used in my appliction
>> require log4j also,they need the log4j.properties to generate there logs.
>>
>> Any ideas?
>>
>
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