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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