Class to handle persistence using JPOX tool and JDO 2 technology. Every method is atomic, since it uses a different JDO
PersistenceManager for all. Assure to call commit() or rollback() methods when finished to avoid resource consumption. JDO 2.0:
http://jcp.org/en/jsr/detail?id=243 JPOX: http://www.jpox.org
author: Luca Garulli (luca.garulli@assetdata.it)