A naïve API that adds 2 numbers and returns the sum for you. The logging Aspect detects both the execution time and the return value. Logging output may look like this: 2021-05-31 20:00:30.998 INFO ...

You need to tell AspectJ where to find your aspects, and which classes you want it to weave. You also need to tell Spring not to try and weave the same aspects again (in Spring Boot you can do that ...