Both Spring AOP and AspectJ use the different types of weaving and, based on their weaving mechanism, their behavior regarding performance and ease of use are different.

To perform runtime weaving of our aspects during the execution of the application, Spring creates proxies of the targeted object using either the JDK dynamic proxy or CGLIB proxy, which we discussed earlier.

As opposed to Spring AOP's runtime weaving, AspectJ performs weaving at compile-time or classload-time. We already saw different types of AspectJ weaving in the preceding section.