How can logging be configured and maintained in an application developed with Spring Boot?

Logging in Spring Boot is primarily configured through built-in support for SLF4J and Logback (by default). You can configure logging using the application.properties or application.yml file.

Example configuration in application.properties:

logging.level.root=INFO
logging.level.com.example=DEBUG
logging.file.name=app.log

• logging.level.root — the default logging level.
• logging.level.com.example — the logging level for the com.example package.
• logging.file.name — the filename for log output.

For more fine-tuned configuration, you can create a custom Logback configuration file (logback-spring.xml), where you can define appenders, output patterns, and logging levels.

Logging in code is done via SLF4J:

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

public class MyService {
    private static final Logger logger = LoggerFactory.getLogger(MyService.class);

    public void doWork() {
        logger.info("Starting work");
        try {
            // logic
        } catch (Exception e) {
            logger.error("Error during work", e);
        }
    }
}

Thus, Spring Boot simplifies logging setup, allowing quick changes to levels and log output without modifying code.