Java™ Application Development on Linux - Dator

14.7 Beyond the Basics321Hibernate 4Hibernate is probably the most widely known Open Source persistenceframework. It is released under the LGPL license.OJB 5 Billed as “Object Relational Bridge,” this one is from Apache. It providesboth an ODMG (a persistence API much used in the C++ world) and aJDO (Java Data Objects—Sun’s object persistence API specification) API.Castor 6Castor does persistence to both XML and relational databases. They calltheir RDBMS persistence framework “JDO,” but beware: It is not compatiblewith or identical to Sun’s JDO. They say it is better.pBeans 7pBeans does fully automated persistence of JavaBeans. You have to followthe rules for writing beans (not EJBs, but the “classic” JavaBeans), butonce done, this will automatically persist your instances to any JDBCcompatibledatabase. No XML specification, no SQL scripting, no templates.For the easiest “just save my instance data” type of applications,this can be a good choice. 8 This product even automates the creation oftables, as we advocated above.Are there others? Heck, yes. Not all of them persist to relational databases.Some persist only to XML. Some to other databases like B-trees or the BerkeleyDB system. We didn’t concern ourselves with those. We also left off a coupleof libraries that appear not to have been developed for more than a coupleof years.4. http://www.hibernate.org/5. http://db.apache.org/ojb/6. http://castor.exolab.org/7. http://pbeans.sourceforge.net/8. But we are not endorsing here.