DataNucleus

DataNucleus has asked 1 questions and find answers to 66 problems.

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About

Specialists in JDO/JPA Java persistence since 2003, and member of JDO expert group.

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DataNucleus questions

Using maven-release-plugin with GitHub "You can't push to git://github.com/..."

DataNucleus answers

Is it mandatory to instantiate collection fields in JPA?
How to mix Inheritance Strategies in combination with multiple subclass layers
How to get the field annotated with @Id in EJB3 (JPA) and Hibernate?
JPA 1.0 @OrderBy uses field names vs. JPA 2.0 @OrderColumn uses column names
JPA - When to use getTransaction() when persisting objects
How to handle JPA annotations for a pointer to a generic interface
Multiple Threads accessing the database: one with long transaction, one with short transactions
JNDI lookup works fine using lookUp but not when used in persistence.xml of JPA
JPA: Usage of @GeneratedValue on non-id column
How do I add a column to a JPA entity, and still keep my data?