How can I determine what log configuration source Logback actually used?

Question

log4j has a property, log4j.debug, which will helpfully provide the user with an indication of which configuration file was actually used to configure the loggi

Answer 1

If you want to go deep into Logback, you can do the following

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.core.joran.util.ConfigurationWatchListUtil;

public class Main {

    private static final Logger logger = LoggerFactory.getLogger(Main.class);

    public static void main(String[] args) throws Exception {
        LoggerContext loggerContext = ((ch.qos.logback.classic.Logger)logger).getLoggerContext();
        URL mainURL = ConfigurationWatchListUtil.getMainWatchURL(loggerContext);
        System.out.println(mainURL);
        // or even
        logger.info("Logback used '{}' as the configuration file.", mainURL);
    }
}

It will print the URL of the loaded configuration file.