terraza de aravaca: JPA implementations comparison: Hibernate, Toplink Essentials, Openjpa, Eclipselink
http://terrazadearavaca.blogspot.com/2008/12/jpa-implementations-comparison.html

Vergleich verschiedener JPAs

In looking at your code, none of your queries actually return an objects. They are all count queries, returning a single number. Hardly a typical usage of object-relational mappings, makes the comparison not very useful.

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