This part is still in progress.
We present here study notes on certificate “Oracle Certified Expert, Java EE 6 Enterprise JavaBeans Developer”. The aim is to provide brief and complete knowledge base. There is no broad descriptions, repeated several times and examples showing the same issue in many different ways. We do not explain concepts and motivations of EJB in details. This is rather set of rules, possibly precise and brief. We take more technical point of view on EJB.