log4j initialization

[arfatkhan]

Hi Everybody,

I want to use log4j in my application. I downloaded the required jar file, now I want to initialize it.Please help me, how to initialize log4j.

[mary]

I give you an example

Code:

package com.foo;

import org.apache.log4j.PropertyConfigurator;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import java.io.PrintWriter;
import java.io.IOException;

public class Log4jInit extends HttpServlet {

  public
  void init() {
    String prefix =  getServletContext().getRealPath("/");
    String file = getInitParameter("log4j-init-file");
    // if the log4j-init-file is not set, then no point in trying
    if(file != null) {
      PropertyConfigurator.configure(prefix+file);
    }
  }

  public
  void doGet(HttpServletRequest req, HttpServletResponse res) {
  }

if you want more details you can check the documentation of the log4j project

[arfatkhan]

Hi ,

I am using weblogic server.As I mentioned I downloaded the required log4j.jar. When I am runing my application, on the server console I am getting this warning.

log4j:WARN No appenders could be found for logger (org.apache.commons.digester.D
igester).
log4j:WARN Please initialize the log4j system properly.

Please help me to overcome this problem.

Thanks

[simon]

This means that the log4j.properties file that you have created in NOT in
the classpath. Make it available in the classpath.