Re: Issue in using log4j

From:

Lew <noone@lewscanon.com>

Newsgroups:

comp.lang.java.programmer

Date:

Fri, 05 Sep 2008 21:50:12 -0400

Message-ID:

<g5ednaRALYhJfFzVnZ2dnUVZ_t2dnZ2d@comcast.com>

arvind wrote:

Hi All,

I want to use logger in my application.

I have AA.java:
****************************************************************************
package A;

Package names should comprise only lower-case letters:

package a;

import org.apache.log4j.Logger;

public class AA {
    static Logger logger = Logger.getLogger(AA.class);

    public static void main(String[] args) {
        logger.info("Hi There");

    }

}
****************************************************************************
log4j.properties as:

### direct messages to file ###
log4j.appender.file=org.apache.log4j.RollingFileAppender
log4j.appender.file.File=C:\A.txt

You might want to get in the habit of using forward slashes.

Java .properties files treat backslash as an escape character, so "C:\A.txt"
is not interpreted as you expect.

log4j.appender.file.layout=org.apache.log4j.PatternLayout
log4j.appender.file.layout.ConversionPattern=%d{dd MMM yyyy
HH:mm:ss,SSS}%5p %t %c{1}:%L - %m%n
log4j.appender.file.MaxFileSize=5120KB
# Archive log files (one backup file here)
log4j.appender.file.MaxBackupIndex=1

****************************************************************************
I have included log4j.jar in classpath.
But I am getting following error:
"log4j:WARN No appenders could be found for logger (A.AA).
log4j:WARN Please initialize the log4j system properly."

<http://logging.apache.org/log4j/1.2/manual.html>

your missing a rootLogger:

log4j.rootLogger=warn, file

You can also change the logging level for different namespaces independently:

log4j.logger.a=DEBUG

--
Lew