Run Example in


How to run the example program in I have installed at \local\apache-log4j-1.2.17 folder.


A is an example program provided in the It is used to show you how to use Log4j with the default configuration. Here is the source code of in the \local\apache-log4j-1.2.17\examples folder:

 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
package examples;
import org.apache.log4j.Logger;
import org.apache.log4j.BasicConfigurator;
import org.apache.log4j.NDC;
// ...
public class Trivial {

  static Logger logger = Logger.getLogger(Trivial.class);

  public static void main(String[] args) {
    NDC.push("Client #45890");"Awake awake. Put on thy strength.");;;"Exiting Trivial.");    

  void foo() {
    logger.debug("Now king David was old.");    

  static class InnerTrivial {
    static  Logger logger = Logger.getLogger(InnerTrivial.class);

    void foo() {"Entered foo."); 

You can follow these steps to run the example program:

\fyicenter>cd \local\apache-log4j-1.2.17

\lccal\apache-log4j-1.2.17>java -version
java version "1.7.0_45"

\local\apache-log4j-1.2.17>javac -cp log4j-1.2.17.jar examples\

\local\apache-log4j-1.2.17>java -cp .;log4j-1.2.17.jar examples.Trivial

0 [main] INFO examples.Trivial Client #45890 - Awake awake. Put on thy strength.
0 [main] DEBUG examples.Trivial Client #45890 DB - Now king David was old.
1 [main] INFO examples.Trivial$InnerTrivial Client #45890 - Entered foo.
1 [main] INFO examples.Trivial Client #45890 - Exiting Trivial.

The source code and the output shows that

  • Logger.getLogger(Trivial.class) is used to create a logger object with the class name.
  • BasicConfigurator.configure() is used to set the logger to use the default configuration.
  • NDC.push() and NDC.pop() are used to manage the context identification.
  •"Exiting Trivial.") is used to log a message at the "INFO" level.
  • "0 [main] INFO ..." in the log output gives the execution time, thread name, log level and other log information.

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2016-06-27, 753👍, 0💬