This custom annotation shows execution time that used method via aspect oriented programming in spring.

LogExecutionTime.java

@Target(ElementType.METHOD)
@Retention(RetentionPolicy.RUNTIME)
public @interface LogExecutionTime {

}

LogExecutionTimeAspect.java

@Aspect
@Component
public class LogExecutionTimeAspect {

    @Around("@annotation(LogExecutionTime)")
    public void logExecutionTime(ProceedingJoinPoint joinPoint) throws Throwable {
        long startTime = System.currentTimeMillis();

        joinPoint.proceed();

        String className = joinPoint.getTarget().getClass().getSimpleName();
        String methodName = joinPoint.getSignature().getName();

        Logger LOGGER = LoggerFactory.getLogger("Execution time of " + className + "." + methodName);
        LOGGER.info(System.currentTimeMillis() - startTime + " ms");
    }

}