When using starters, Logback is used for logging by default.
@RestController public class LoggingController { Logger logger = LoggerFactory.getLogger(LoggingController.class); @RequestMapping("/") public String index() { logger.trace("A TRACE Message"); logger.debug("A DEBUG Message"); logger.info("An INFO Message"); logger.warn("A WARN Message"); logger.error("An ERROR Message"); return "Howdy! Check out the Logs to see the output..."; } }
the default logging level of the Logger is preset to INFO, meaning that TRACE and DEBUG messages are not visible.
References
https://www.baeldung.com/spring-boot-logging