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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