Summary

In this chapter, you have seen a lot of the cornerstone concepts when it comes to architectural patterns and best practices in Java. In particular, you started with the concept of encapsulation; one practical way to achieve it is the hexagonal architecture. You then moved to multi-tier architectures, which is a core concept in Java and JEE (especially the three-tier architecture, which is commonly implemented with beans, servlets, and JSPs).

There was a quick look at MVC, which is more a design pattern than an architectural guideline but is crucial to highlight some concepts such as the importance of separating presentation from business logic. You then covered the asynchronous and event-driven architecture concepts, which apply to a huge portion of different approaches that are popular right now in the world of Java. These concepts are known for their positive impacts on performance and scalability, which were also the final topics of this chapter.

While being covered...