Log4j Tutorial : How to Create Multiple Appenders

Step 1: Create a dynamic web application in eclipse
Step 2: Create web.xml file as fallows:

<?xml version="1.0" encoding="UTF-8"?>
<web-app xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns="http://java.sun.com/xml/ns/javaee" xmlns:web="http://java.sun.com/xml/ns/javaee/web-app_2_5.xsd" xsi:schemaLocation="http://java.sun.com/xml/ns/javaee http://java.sun.com/xml/ns/javaee/web-app_3_0.xsd" id="WebApp_ID" version="3.0">
  <display-name>CMIS_NEW</display-name>
  <welcome-file-list>
    <welcome-file>index.jsp</welcome-file>
  </welcome-file-list>
  
  <servlet>
  <servlet-name>TestLog4j</servlet-name>
  <servlet-class>com.cims.TestLog4jServlet</servlet-class>
  </servlet>
   
  <servlet-mapping>
   <servlet-name>TestLog4j</servlet-name>
   <url-pattern>/test</url-pattern>
  </servlet-mapping>
   
   
   
</web-app>

Step 3 :Create Servlet to initialize the Log4j properties through xml file

package com.cims;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
 
import org.apache.log4j.PropertyConfigurator;
import org.apache.log4j.xml.DOMConfigurator;
 
public class Log4JServlet extends HttpServlet {
  
 public void init() throws ServletException{
   
  String log4jfile = getInitParameter("log4j-init-file");
  if(log4jfile != null){
   String propfile = getServletContext().getRealPath(log4jfile);
   //PropertyConfigurator.configure(propfile);
   DOMConfigurator.configure(propfile);
  }
   
 }
 
}

Step 4: Create your Log4j configuratioin xml and place into the classpath

package com.cims;<br/> <br/>import javax.servlet.ServletException;<br/>import javax.servlet.http.HttpServlet;<br/> <br/>import org.apache.log4j.PropertyConfigurator;<br/>import org.apache.log4j.xml.DOMConfigurator;<br/> <br/>public class Log4JServlet extends HttpServlet {<br/>  <br/> public void init() throws ServletException{<br/>   <br/>  String log4jfile = getInitParameter(&quot;log4j-init-file&quot;);<br/>  if(log4jfile != null){<br/>   String propfile = getServletContext().getRealPath(log4jfile);<br/>   //PropertyConfigurator.configure(propfile);<br/>   DOMConfigurator.configure(propfile);<br/>  }<br/>   <br/> }<br/> <br/>}

Step 5:Now create a servlet to test the configuration

package com.cims;
 
import java.io.IOException;
import java.io.PrintWriter;
 
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
 
import org.apache.log4j.Logger;
 
 
public class TestLog4jServlet extends HttpServlet {
  
 /**
  *
  */
 private static final long serialVersionUID = 1L;
 static Logger logger = Logger.getLogger(TestLog4jServlet.class);
  
 public void doGet(HttpServletRequest req,HttpServletResponse res)
   throws ServletException,IOException{
  logger.info("Starting the "+this.getClass().getName()+" doGet() Method");
  res.setContentType("text/html");
  PrintWriter out = res.getWriter();
  out.println("Log4j Debugger Example");
  logger.info("Exiting the "+this.getClass().getName()+" doGet() Method");
  logger.debug("Debug Logs");
  logger.warn("Warn Messages");
  logger.error("Error Logs");
  logger.fatal("Fatal logs");
   
 }
 
}

Here is the output at console