package com.baeldung.springbootmvc; import org.slf4j.Logger; import org.slf4j.LoggerFactory; import org.springframework.web.bind.annotation.GetMapping; import org.springframework.web.bind.annotation.RestController; @RestController public class LoggingController { Logger logger = LoggerFactory.getLogger(LoggingController.class); @GetMapping("/") 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..."; } }