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From Peter Walter <peter.wal...@estradis.com>
Subject Re: specify the relative directory to log
Date Wed, 06 May 2009 14:00:48 GMT
Hello Luca,

you can solve this via a system property.

When you specify your log file like this:


Log4J replaces ${log4j.logpath} with the system property log4j.logpath 
(at least thats what happens in log4j 1.2.15 when using configuration 
via properties file - I'm not perfectly sure about other versions or XML 
config, but i would guess that to work similar there).

Now you just have to set the system property via

System.setProperty("log4j.logpatch", pathToLog);

in your application _before_ initializing the logging system.
To be sure to set the property before initialization you should not use 
the automatic properties resolution of Log4J but use 


Luca Ferrari schrieb:
> On Wednesday 06 May 2009 03:04:59 pm Marc Farrow's cat walking on the keyboard 
> wrote:
>> I am not sure what the problem is, because the example I posted was totally
>> in the program and not in a properties file.
> Sorry, allow me to explain it better. I've got an application with its log4j 
> configuration file, where there is specified a log directory that is relative. I 
> want to transform such log path absolute, because I could install and run the 
> application from several paths, but I want the logs to be stored always in the 
> same folder. Such folder must be computed the first time the application is 
> started, and therefore I cannot specify such absolute path into the log4j file. 
> That's why I'd like to keep the log4j configuration file with the relative path 
> and transform such path absolute at run-time.
> Luca
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  Dipl. Inf. (FH) Peter Walter
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