Configure Logback under Spring using Java and Not XML

Question

Under Spring[Boot], how do you configure Logback programmatically either using JavaConfig or some kind of Annotation-based configuration. I wish to avoid XML files as much as possible

Examples are welcome

I am NOT looking for links to the following. I already have these. Assuming I have these, my question is how to get to the goal of this question. How to configure Lockback in Java when NOT under Spring How to set up Logback under Spring or Spring Boot using XML

Answer 1

Yes. It's possible if you want to configure programmatically. For example, the code below is working for me:

import ch.qos.logback.classic.Level;
import ch.qos.logback.classic.Logger;
import ch.qos.logback.classic.LoggerContext;
import ch.qos.logback.classic.encoder.PatternLayoutEncoder;
import ch.qos.logback.classic.spi.ILoggingEvent;
import ch.qos.logback.core.FileAppender;
import org.slf4j.LoggerFactory;

public class LoggerUtil {
  public static void main(String[] args) {
    Logger example1 = createLoggerFor("example1", "example1.log");
    Logger example2 = createLoggerFor("example2", "example2.log");
    example1.info("test-example1");
    example2.info("test-example2");
  }

  private static Logger createLoggerFor(String string, String file) {
    LoggerContext loggerContext = (LoggerContext) LoggerFactory.getILoggerFactory();
    PatternLayoutEncoder patternLayoutEncoder = new PatternLayoutEncoder();

    patternLayoutEncoder.setPattern("%date %level [%thread] %logger{10} [%file:%line] %msg%n");
    patternLayoutEncoder.setContext(loggerContext);
    patternLayoutEncoder.start();
    FileAppender<ILoggingEvent> fileAppender = new FileAppender<ILoggingEvent>();
    fileAppender.setFile(file);
    fileAppender.setEncoder(patternLayoutEncoder);
    fileAppender.setContext(loggerContext);
    fileAppender.start();

    Logger logger = (Logger) LoggerFactory.getLogger(string);
    logger.addAppender(fileAppender);
    logger.setLevel(Level.DEBUG);
    logger.setAdditive(false); /* set to true if root should log too */

    return logger;
  }
}