Performance

When you hear the phrase Java EE application server, the first thing that may come to your mind is the word heavyweight, as this is the way in which application servers are often described. It's worth noting however that the Java EE specification doesn't prescribe for its implementation to be slow and bloated, and many modern application servers (WildFly included) indeed don't follow that nonexistent rule.

WildFly starts within seconds and is highly optimized in terms of resource usage. You are going to see it many times throughout the book. We are going to run a number of WildFly based services and tests, all of them running immediately and with small memory footprint.