To understand JEE you first need to align with the motivation for the platform: distributed component oriented systems for an heterogenous enterprise environmen

To understand JEE you first need to align with the motivation for the platform: distributed component oriented systems for an heterogenous enterprise environment. The second preliminary is to fully grok why indirection is necessary for loosely coupled component systems. JEE is built on a set of canonical indirection layers. The rest is simply a set of orthogonal specs -- none in anyway intellectually or technically challenging. Building a tutorial full stack JEE app should let you see and touch most of these layers from client to backend. It is a good thing that the new hotness in coding is ignoring JEE ..