CODEWITHSUNDEEP
javalogging
Accountant م
Accountant م

Reputation: 7483

Why my java application is not logging to the default java0.log file of java.util.logging?

I recently installed Java 1.14 JDK on my Linux machine and started to learn Java, and I'm now stuck trying to figure out why this code is not writing to the default log file.

package foo;

import java.util.logging.Level;
import java.util.logging.Logger;

public class Main {

    public static void main(String[] args) {

        Logger logger = Logger.getLogger("test");

        logger.log(Level.INFO, "testinggggg info");
        logger.log(Level.SEVERE, "testinggggg severe");
        logger.log(Level.WARNING, "testinggggg warning");
        logger.log(Level.FINE, "testinggggg fine");
    }
}

This code prints to the console

INFO: testinggggg info
Apr 01, 2020 2:45:57 AM foo.Main main
SEVERE: testinggggg severe
Apr 01, 2020 2:45:57 AM foo.Main main
WARNING: testinggggg warning

This is the contents of the my /usr/java/jdk-14/conf/logging.properties file 

# I have omitted all comments
handlers= java.util.logging.ConsoleHandler

.level= INFO

java.util.logging.FileHandler.pattern = %h/java%u.log
java.util.logging.FileHandler.limit = 50000
java.util.logging.FileHandler.count = 1

java.util.logging.FileHandler.maxLocks = 100
java.util.logging.FileHandler.formatter = java.util.logging.XMLFormatter

java.util.logging.ConsoleHandler.level = INFO
java.util.logging.ConsoleHandler.formatter = java.util.logging.SimpleFormatter

When I check most of the system properties I see NULL, for example executing these lines in my application printing NULL

System.out.println(System.getProperty("java.util.logging.FileHandler.pattern"));
System.out.println(System.getProperty("java.util.logging.FileHandler.limit"));
System.out.println(Main.class.getClassLoader().getResource("logging.properties"));

I don't have any file in my $HOME directory with the name java0.log or java1.log. Why is my application not writing to these files ?

Upvotes: 1

Views: 738

Answers (1)

Accountant م
Accountant م

Reputation: 7483

Finaaaaaaaaaaaaaaaaaly

I changed this 

handlers= java.util.logging.ConsoleHandler

to this

handlers= java.util.logging.FileHandler, java.util.logging.ConsoleHandler

In my /usr/java/jdk-14/conf/logging.properties file, and now I have java0.log under my Linux $HOME directory with these logs

BTW, changing the logging.properties and saving it, made the changes take effect immediately without restarting my computer, or java or something.

Upvotes: 2

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