This project provides code samples of how to use well-known Java persistence frameworks. This project aims at easing the first steps when evaluating a (new) Java persistence framework. The provided samples will exhaustively exemplify all general features of these persistence frameworks. All samples are based on Ant and include Eclipse project settings.

Samples

• standard use cases
• hello world - setup tooling and runtime environment
• hidden object identity
• optimistic locking / pessimistic locking
• attach / detach / merge
• composite primary key
• fields
• date/time
• big decimal
• large binary objects/large character objects
• enumerations
• relationships
• one to one/ one to many / many to many
• list of primitives / structs
• inheritance
• new table (joined) / superclass table / subclass table / mixed
• querying
• is-null queries
• object queries
• bulk update/delete queries
• collection queries - is-empty, none-of, any-of, all-of
• downcast queries
• optimizations
• eager fetching / lazy loading
• fetch plans

Used Frameworks

• DataNucleus Access Platform 1 / 2
• see http://www.datanucleus.org/
• JDO 2, JDO 3, JPA, JPA with XML, JPA 2, JPA 2 with XML
• EclipseLink 1 / 2
• see http://www.eclipse.org/eclipselink/
• JPA, JPA with XML, JPA 2, JPA 2 with XML
• Hibernate 3.3 / 3.5+
• see http://www.hibernate.org/
• native mode, JPA, JPA with XML, JPA 2, JPA 2 with XML
• Apache OpenJPA 1 / 2
• see http://openjpa.apache.org/
• JPA, JPA with XML, JPA 2, JPA 2 with XML
• Oracle TopLink 11g
• see http://www.oracle.com/technology/products/ias/toplink/index.html
• native mode, native mode with XML
• Avajé Ebeans
• http://www.avaje.org/
• native mode with JPA annotations

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