# Absolute Beginner EJB 3 / JPA Series - the Essential Bootstraps And Background Information

The EJB 3 / JPA series are really popular (several thousands views). I was asked to provide an overview, so here are the posts so far:EJB 3 plain intro Dependency Injection introJPA introInterception / "AOP" introI answered some frequently asked questions during the the inception phase of my Java EE 5 projects in my blog as well: So if you have EJB 3, are "Plain Old Web Containers" still viable?What happens, in case EJB 3 turn out to be not powerful enough?Are POJOs lot faster, comparing them to EJB 3?What's about the memory consumption?Are EJB 3 threadsafe? Do they run well on multi-core, multi-CPU machines?Are EJB 3 actually lightweight or heavyweight?How fast is the deployment of several hundred JPA-Entities and Session Beans?Monolithic Or Modular?Integration Of "Legacy" POJOs - why not to inject a DefaultTableModel into an EJB?...and why I like them