Spring boot embedded tomcat logs

Question

i\'m using spring boot embedded tomcat with spring boot 1.5.9 , im also using Log4j2.

recently i exerience problems during load, so i want to understand better the

Answer 1

For slf4j and Spring Boot 2 hide exceptions from Tomcat and handle them by yourself:

• Add to pom:

  <dependency>
      <groupId>org.slf4j</groupId>
      <artifactId>jul-to-slf4j</artifactId>
      <version>${slf4j.version}</version>
  </dependency>
  

• Add to config:

  @PostConstruct
  void postConstruct() {
      SLF4JBridgeHandler.install();
  }
  

• Add to application.yaml

  logging:
      level:
        org.apache.catalina: off
  

• Handle exception in ErrorController

  @Controller
  @Slf4j
  public class ErrorController implements 
                org.springframework.boot.web.servlet.error.ErrorController {
      private static final String ERROR_PATH = "/error";
  
     @Autowired
     private ErrorAttributes errorAttributes;
  
     @Override
     public String getErrorPath() {
        return ERROR_PATH;
     }
  
     @RequestMapping(ERROR_PATH)
     public ModelAndView error(HttpServletRequest request) {
         return processException(errorAttributes.getError(new ServletWebRequest(request)));
     }
  }