content: package net.alanbinu.springboot2.springboot2jpacrudexample.aspect;
  
  import java.util.Arrays;
  
  import org.aspectj.lang.JoinPoint;
  import org.aspectj.lang.ProceedingJoinPoint;
  import org.aspectj.lang.annotation.AfterThrowing;
  import org.aspectj.lang.annotation.Around;
  import org.aspectj.lang.annotation.Aspect;
  import org.aspectj.lang.annotation.Pointcut;
  import org.slf4j.Logger;
  import org.slf4j.LoggerFactory;
  import org.springframework.stereotype.Component;
  
  /**
   * Aspect for logging execution of service and repository Spring components.
   * @author Ramesh Fadatare
   *
   */
  @Aspect
  @Component
  public class LoggingAspect {
  
      private final Logger log = LoggerFactory.getLogger(this.getClass());
  
      /**
       * Pointcut that matches all repositories, services and Web REST endpoints.
       */
      @Pointcut("within(@org.springframework.stereotype.Repository *)" +
          " || within(@org.springframework.stereotype.Service *)" +
          " || within(@org.springframework.web.bind.annotation.RestController *)")
      public void springBeanPointcut() {
          // Method is empty as this is just a Pointcut, the implementations are in the advices.
      }
  
      /**
       * Pointcut that matches all Spring beans in the application's main packages.
       */
      @Pointcut("within(net.alanbinu.springboot2.springboot2jpacrudexample..*)"+
          " || within(net.alanbinu.springboot2.springboot2jpacrudexample.service..*)"+
          " || within(net.alanbinu.springboot2.springboot2jpacrudexample.controller..*)")
      public void applicationPackagePointcut() {
          // Method is empty as this is just a Pointcut, the implementations are in the advices.
      }
  
      /**
       * Advice that logs methods throwing exceptions.
       *
       * @param joinPoint join point for advice
       * @param e exception
       */
      @AfterThrowing(pointcut = "applicationPackagePointcut() && springBeanPointcut()", throwing = "e")
      public void logAfterThrowing(JoinPoint joinPoint, Throwable e) {
              log.error("Exception in {}.{}() with cause = {}", joinPoint.getSignature().getDeclaringTypeName(),
                  joinPoint.getSignature().getName(), e.getCause() != null? e.getCause() : "NULL");
      }
  
      /**
       * Advice that logs when a method is entered and exited.
       *
       * @param joinPoint join point for advice
       * @return result
       * @throws Throwable throws IllegalArgumentException
       */
      @Around("applicationPackagePointcut() && springBeanPointcut()")
      public Object logAround(ProceedingJoinPoint joinPoint) throws Throwable {
          if (log.isDebugEnabled()) {
              log.debug("Enter: {}.{}() with argument[s] = {}", joinPoint.getSignature().getDeclaringTypeName(),
                  joinPoint.getSignature().getName(), Arrays.toString(joinPoint.getArgs()));
          }
          try {
              Object result = joinPoint.proceed();
              if (log.isDebugEnabled()) {
                  log.debug("Exit: {}.{}() with result = {}", joinPoint.getSignature().getDeclaringTypeName(),
                      joinPoint.getSignature().getName(), result);
              }
              return result;
          } catch (IllegalArgumentException e) {
              log.error("Illegal argument: {} in {}.{}()", Arrays.toString(joinPoint.getArgs()),
                  joinPoint.getSignature().getDeclaringTypeName(), joinPoint.getSignature().getName());
              throw e;
          }
      }
  }
  