Apache Commons Logging

package com.cascadetg.ch09;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.commons.logging.impl.Jdk14Logger;

public class LogGenerator
{
  // Note that you pass in an instance of this class to the
  // log generator. This allows you to find the messages
  // generated by this class.
  private static Log log = LogFactory.getLog(LogGenerator.class);

  public static void configJDKLogger()
  {
    try
    {
      ((Jdk14Logger)log).getLogger().setLevel(
java.util.logging.Level.ALL);
      ((Jdk14Logger)log).getLogger().addHandler(
(java.util.logging.FileHandler)Class
        .forName("java.util.logging.FileHandler")
        .newInstance());

      System.out.println("Added JDK 1.4 file handler");
    } catch (Exception e)
    {
      System.out.println("Unable to load JDK 1.4 logging.");
      e.printStackTrace();
    }
  }

  public static void main(String[] args)
  {
    configJDKLogger();
    System.setErr(System.out);

    System.out.println();
    System.out.println("Test fatal log");

    try
    {
      String foo = null;
      int x = 0 / (new Integer(foo)).intValue();
    } catch (Exception e)
    {
      log.fatal(e.getMessage(), e);
    }

    System.out.println();
    System.out.println("Test error log");

    try
    {
      Object foo = null;
      foo.toString();
    } catch (Exception e)
    {
      log.error(e.getMessage(), e);
    }

    System.out.println();
    System.out.println("Test warn log");
    try
    {
      Class.forName("com.cascadetg.NonexistantClass");
    } catch (Exception e)
    {
      log.warn("Can't find a non-existent class!");
    }

    System.out.println();
    System.out.println("Test info log");

    log.info("Starting app!");
    log.info("Quitting app!");

    System.out.println();
    System.out.println("Test debug log");

    if (1 > 2)
    {
      log.debug("1 > 2 evaluated true");
      if (10 % 2 == 0)
        log.debug("10 % 2 is 0");
      else
        log.debug("10 % 2 is not 0");
    } else
    {
      log.debug("1 > 2 evaluated false");
    }

    System.out.println();
    System.out.println("Test trace log");

    log.trace("Calling trace method.");
    log.trace("Calling trace method.");
    log.trace("Calling trace method.");
    log.trace("Calling trace method.");
    log.trace("Calling trace method.");

    System.out.println();
    System.out.println("Log test complete.");
  }
}