Second MyApp example 1/4

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// Import log4j classes.
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;

public class MyApp {

  // Define a static logger variable so that it references
  // the Logger instance named "MyApp".
  static Logger logger = Logger.getInstance(MyApp.class);

  public static void main(String[] args) {

    // Set up a simple configuration that logs on the console.
    PropertyConfigurator.configure(args[0]);

    logger.info("Entering application.");
    Bar bar = new Bar();
    bar.doIt();
    logger.info("Exiting application.");
  }
}

The previous MyApp example always outputs the same log information. Fortunately, it is easy to modify MyApp so that the log output can be controlled at run-time.

The second version of MyApp instructs PropertyConfigurator to parse a configuration file and set up logging accordingly.

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