using java.util.logging across multiple classes

Question

I found this example of using java.util.logging online here. I don't understand how to modify it to use the sample across multiple classes
do I just declare this in every class?

Logger logger = Logger.getLogger(Logger.GLOBAL_LOGGER_NAME);

also in the class, they supplied there is a syntax error:

// suppress the logging output to the console
Logger rootLogger = Logger.*getLogger*("");

what is the correct way to get to the root logger?

package com.vogella.logger;

import java.io.IOException;
import java.util.logging.FileHandler;
import java.util.logging.Formatter;
import java.util.logging.Level;
import java.util.logging.Logger;
import java.util.logging.SimpleFormatter;

public class MyLogger {
    static private FileHandler fileTxt;
    static private SimpleFormatter formatterTxt;

    static private FileHandler fileHTML;
    static private Formatter formatterHTML;

    static public void setup() throws IOException {

        // get the global logger to configure it
        Logger logger = Logger.getLogger(Logger.GLOBAL_LOGGER_NAME);

        // suppress the logging output to the console
        Logger rootLogger = Logger.*getLogger*("");
        Handler[] handlers = rootLogger.getHandlers();
        if (handlers[0] instanceof ConsoleHandler) {
            rootLogger.removeHandler(handlers[0]);
        }

        logger.setLevel(Level.INFO);
        fileTxt = new FileHandler("Logging.txt");
        fileHTML = new FileHandler("Logging.html");

        // create a TXT formatter
        formatterTxt = new SimpleFormatter();
        fileTxt.setFormatter(formatterTxt);
        logger.addHandler(fileTxt);

        // create an HTML formatter
        formatterHTML = new MyHtmlFormatter();
        fileHTML.setFormatter(formatterHTML);
        logger.addHandler(fileHTML);
    }
}

Naman · Accepted Answer · 2017-09-26 17:32:13Z

2

Yes. Using GLOBAL_LOGGER_NAME as stated in the linked Javadoc as well serves as logging using the global logger from each class. Though the usefulness is not much as it is a default java logger provided.

GLOBAL_LOGGER_NAME is a name for the global logger. This name is provided as a convenience to developers who are making casual use of the Logging package....

The preferred way to get the global logger object is via the call Logger.getLogger(Logger.GLOBAL_LOGGER_NAME).

It's also an alternate of Logger.getGlobal() from the older jdk versions.

To configure the root logger use :-

Logger logger = Logger.getLogger("");

edited Sep 26, 2017 at 17:32

answered Sep 26, 2017 at 15:36

Naman

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1 Comment

JavaSheriff Over a year ago

thank you sir, any idea about the other question (Logger rootLogger = Logger.*getLogger*("");)

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