JPA 

• Java Persistence Performance
• JPA 2.1 Early Draft Explained – Java EE 7 making progress
• [RU] Java EE 6. Обзор JPA 2.0: Введение, Коллекции
• [RU] Реализация составных ключей с помощью JPA и Hibernate
• [RU] Динамические типобезопасные запросы в JPA 2.0
• [RU] JPA: Хранение перечислений в базе данных
• [RU] OrderBy или OrderColumn
• ObjectDB 2.3 Developer's Guide
• The Java Persistence Query Language (глава из The Java EE 5 Tutorial)
• JPA Tutorial: Getting Started, JPA Working with Queries, A Mini Application, Inheritance and Polymorphic Queries
• Introduction to Java Persistence API (JPA)
• JPA Criteria API by samples – Part-I
• JPA Criteria API by samples – Part-II
• Where to put named queries in JPA?
• JPA Compound Primary Keys Explained
• JPA Lifecycle Callback Events
• JPA and Enums
• The Top 5 New Annotations in JPA 2
• Transactions in a JPA World
• Understanding JPA, Part 1: The object-oriented paradigm of data persistence
• Hibernate EntityManager
• A typesafe criteria query API for JPA
• Статьи в блоге Warlock's Thoughts
• Using Composite Keys with JPA
• Extending your JPA POJOs
• QBE pattern, Advanced QBE pattern (common using generics)
• JPA 2 new feature @ElementCollection explained
• How to Get the JPQL/SQL String From a CriteriaQuery in JPA?
• Hibernate Search and JPA tutorial: part 1, part 2
• JPA 2.0: Map Collections – Basic Type
• JPA Entity Lifecycle Callback and Listener Annotations
• Pessimistic and Optimistic Locking in JPA 2.0
• Second Level Caching
• JPA – Should I become a laziness extremist?
• JPA – Basic Projections

• Hibernate Mapping Cheat Sheet