Somewhere around 2007 – 2008 I was setting up a new project which had a business model (BM) as the central component. The business model I envisioned had a three layered structure: an AbstractBean handling all the Java bean plumbing, a from-the-database-reverse-engineered class with the properties (setters and getters), and finally a class containing the custom code on top. I wanted to settle on a standard (JPA) and tried using Hibernate at first, but it could not support this layered structure back then, so I ended up using Eclipselink (and with great satisfaction ever since, I must add).
I also have never been a fan of pure application servers (EJBs), so this BM is compiled into a single jar (already postprocessed by Eclipselink), and simply included in all kinds of applications; a client-server Swing application, a REST interface to support an Android app, several im- and exporters for EDIFACT, emails, XML, and of course a nice in-house webapp. Not having an additional single point of failure (besides the database) is very pleasing and keeps the overall architecture much more simple. Continue reading “Stand alone business model with Activiti, Eclipselink and unit tests on PostgreSQL”