// pom.xml
// If you are using spring-boot-starter-web, logging is automatically included with "spring-boot-starter-logging" jar
// application.properties
logging.level.org.springframework=debug // everything else will print as debug level
logging.level.[com.package.name]=trace // only this package will print as trace level
// Controlller
@Controller
public class SayHelloController { private Logger logger = LoggerFactory.getLogger(getClass());	@RequestMapping("say-hello-jsp")	// @RequestParam lets the url take a value as argument to a parameter payload	// "ModelMap" helps to pass data from controller to the specified view	public String sayHelloJsp(@RequestParam(value="name", required = false)String name, ModelMap model){	model.put("name",name); // the name variable now can be accessed in the view with "name" keyword // what you want to log System.out.println(name); // This is NOT RECOMMENDED in prod environment logger.debug(name); // debug level logging logger.info("This will print on info level"); // info level logging logger.warn("This will print on warn level"); // warn level logging logger.trace("This will print on trace level"); // warn level logging	return "sayHello"; // the jsp file name	}
}

logging.level.org.springframework.web=INFO
logging.level.org.hibernate=ERROR
logging.level.net.guides=DEBUG

// pom.xml
<dependency> <groupId>org.aspectj</groupId> <artifactId>aspectjweaver</artifactId> <version>1.9.5</version>
</dependency>
<dependency> <groupId>org.slf4j</groupId> <artifactId>slf4j-log4j12</artifactId> <version>1.7.30</version>
</dependency>
// log4j.properties
log4j.rootLogger=INFO, stdout
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.Target=System.out
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout
log4j.appender.stdout.layout.ConversionPattern=%d{yyyy-MM-dd HH:mm:ss} %-5p %c{1} - %m%n
// application.properties
logging.level.org.springframework=debug
// ApplicationConfig.java
@Configuration
@PropertySource("classpath:application.properties")
@ComponentScan(basePackages = "com.frankmoley.lil.fid")
@EnableAspectJAutoProxy // Enable AOP
public class ApplicationConfig {
}
// Loggable annotation
@Target(ElementType.METHOD) // annotation should work on methods
@Retention(RetentionPolicy.RUNTIME) // annotation should be loaded during runtime
public @interface Loggable {
}
// Service
@Service
public class GreetingService { @Value("${app.greeting}") private String greeting; public GreetingService(){ super(); } @Loggable // This is the joinpoint : Where the aspected behavior is stitched public String getGreeting(String name){ return greeting + " " + name; }
}
// Aspect class
@Component
@Aspect // ensure for component scanning
public class LoggingAspect { private static final Logger LOGGER = LoggerFactory.getLogger(LoggingAspect.class); @Pointcut("@annotation(Loggable)") // connect with the annotation. The annotation is the pointcut (will trigger this aspect) public void executeLogging(){} // The original Advise : the logic that will run when annotation is called @Before(value = "executeLogging()") // Pre-Advise: the logic that will run before execution of original advise public void logMethodCall(JoinPoint joinPoint){ StringBuilder message = new StringBuilder("Method: "); // *root-start message.append(joinPoint.getSignature().getName()); Object[] args = joinPoint.getArgs(); if (null!=args && args.length>0){ Arrays.asList(args).forEach(arg->{ message.append(arg).append(" | "); }); // *root-end } LOGGER.info(message.toString()); } @AfterReturning(value = "executeLogging()", returning = "returnValue") // Post-Advise: the logic that will run after execution of original advise public void logMethodCall(JoinPoint joinPoint, Object returnValue){ // same as *root-start to *root-end // .. just work with returnValue if(returnValue instanceof Collection){ // *return-start message.append(", returning: ").append(((Collection)returnValue).size()).append(" instance(s)"); }else{ message.append(", returning: ").append(returnValue.toString()); } LOGGER.info(message.toString()); // *return-end } @Around(value = "executeLogging()") // Most Flexible : Anything before original advise, anything after original advise returning value, anything after original advise returning exception public Object logMethodCall(ProceedingJoinPoint joinPoint) throws Throwable { long startTime = System.currentTimeMillis(); Object returnValue = joinPoint.proceed(); long totalTime = System.currentTimeMillis()-startTime; // same as *root-start to *root-end // same as *return-start to *return-end return returnValue; }
}

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
@SpringBootApplication
public class MyApp { private static final Logger logger = LoggerFactory.getLogger(MyApp.class); public static void main(String[] args) { SpringApplication.run(MyApp.class, args); // Logging example logger.trace("This is a TRACE level message."); logger.debug("This is a DEBUG level message."); logger.info("This is an INFO level message."); logger.warn("This is a WARN level message."); logger.error("This is an ERROR level message."); }
}

/*
Create this class somwhere in your app directory structure
(More details on: https://www.baeldung.com/spring-http-logging - Section 5.1)
*/
@Configuration
public class RequestLoggingFilterConfig { @Bean public CommonsRequestLoggingFilter logFilter() { CommonsRequestLoggingFilter filter = new CommonsRequestLoggingFilter(); filter.setIncludeQueryString(true); filter.setIncludePayload(true); filter.setMaxPayloadLength(10000); filter.setIncludeHeaders(false); filter.setAfterMessagePrefix("REQUEST DATA: "); return filter; }
}
/*
Add those to your application.properties file
(More details on: https://www.tutorialworks.com/spring-boot-log-to-file/)
*/
logging.level.org.springframework.web.filter.CommonsRequestLoggingFilter=DEBUG
logging.file.path=/home/logs
logging.file.name=myapp.log

We can use logging with Spring Boot by specifying log levels on the application.properties file.
Spring Boot loads this file when it exists in the classpath and it can be used to configure both Spring Boot and application code.
Spring Boot, by default, includes spring-boot-starter-logging as a transitive dependency for the spring-boot-starter module.
By default, Spring Boot includes SLF4J along with Logback implementations.
If Logback is available, Spring Boot will choose it as the logging handler.
You can easily configure logging levels within the application.properties file without having to create logging provider-specific configuration files such as logback.xml or log4j.properties.

LogBack With SLF4J

<filter> <filter-name>springSecurityFilterChain</filter-name>
<filter-class> org.springframework.web.filter.DelegatingFilterProxy
</filter-class>
</filter>
<filter-mapping> <filter-name>springSecurityFilterChain</filter-name> <url-pattern>/*</url-pattern>
</filter-mapping>