I am trying to use log4j via commons-logging and having problems if the log4j properties file is not called log4.properties.
I get following error:
log4j:WARN No appenders could be found for logger (LogMePlease).
log4j:WARN Please initialize the log4j system properly.
My code is very simple:
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
public class LogMePlease
{
static Log l = LogFactory.getLog(LogMePlease.class);
public static void main(String [] args)
{
l.warn("Hello World!");
}
}
In my class path, i have:
commons-logging.properties file which contains following entries
org.apache.commons.logging.Log=org.apache.commons.logging.impl.Log4JLogger
log4j.configuration=log4j-test.properties
and
log4j-test.properties file
when i run this code i get
log4j:WARN No appenders could be found for logger (LogMePlease).
log4j:WARN Please initialize the log4j system properly.
If I rename log4j-test.properties file to be log4j.properties – then everything works.
So, the question is how can I setup commons logging to use arbitrary name for log4j.properties file.
Best Answer
The file
commons-logging.properties
is only read from commons logging while log4j will look forlog4j.configuration
in the system properties.So you must either specify them with
-Dlog4j.configuration=log4j-test.properties
on the command line as a JVM option or you must callSystem.setProperty()
before the first call to any logging method (which is usually pretty hard to achieve).Note: If you can, use the XML config
log4j.xml
; it's much more simple and powerful for configuring log4j.