Hello Luca,
you can solve this via a system property.
When you specify your log file like this:
log4j.appender.LOGFILE.File=${log4j.logpath}/logfile.log
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
PropertyConfigurator.configure().
Greetings,
Peter
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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