[logback-user] Setting log filename during runtime

[Ceki Gulcu]

Hello Jenny,

Why are you setting the passing value of "logFileName" MDC? Just set it as a 
variable, see http://logback.qos.ch/manual/joran.html and search for "Variable 
substitution".

HTH,

Jenny wrote:
> Hi, I'm not sure if this is the preferred way or best practice... but what I did was extend the RollingFileAppender and override the getFile() method.
>  
> and this getFile() method retrieves / generates the log file name.
>  
> please let me know if you have better solutions.
>  
> thanks,
> Jenny
>  
> =============================================
> From: Jenny jenny_uy81 at yahoo.com
> Subject: Re: [logback-user] Setting log filename during runtime
> To: "logback users list" logback-user at qos.ch
>  
> Hello,
> 
> How can i set the log filename set during the init() of my StartupServlet.
> 
> I tried using MDC but it's not working for me.
> 
> What happens is the file is not created. Instead a file with name "%exp{logFileName}" \
> is created on my web server's bin directory.
> 
> In my StartupServlet, I have this init method that calls MDC.put().
> 
> public void init() throws ServletException {
> MDC.put("logFileName", "c:\\testlogs\\test.log");
> Logger log = LoggerFactory.getLogger(StartupServlet.class); 
> log.info("This should be logged");
> }
> 
> In my logback.xml, I have a MDC.get().
> 
> <appender name="FILE" class="ch.qos.logback.core.rolling.RollingFileAppender">
> <append>true</append>
> <expression name="logFileName">MDC.get("logFileName")</expression>
> <file>%exp{logFileName}</file>
> ...
> 
> I'm new with logback, thanks in advance for your help! I'm trying to follow Ceki's \
> example in his blog http://ceki.blogspot.com/2006/10/repated-configuration-with-joran. \
> html
> 
> thanks,
> jenny
> 
> 
>       
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-- 
Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch