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61

Remove an entity which attributes were changed - OptimisticLockException

We use an OSGi environment and we have three OSGi plugins. In plugin A an entity is loaded and the entity is passed to plugin B. Plugin B changes an attribute on the entity. Plugin C removes the entity from the database. After commit the transaction an exception is caused with optimistic lock
59

Persist error @ManyToMany how to define correct entities relationships

I have Product entities containing a list of Category enties. Each product can have multiple Category but they are all refering to same limited set of Category entities (via ID). There is not changes ... too). @Entity public class Product implements Serializable { @Id @GeneratedValue
59

Object DB vs EclipseLink/TopLink: Unloaded relationships in detached entities

ObjectDB support, while the entities in a result set list from a JPQ query are initially managed ... the transactional one and when you want to use the entity in a transaction it will have to be properly merged ... , which is what you are encountering. As long as the Entity is not serialized, and the connections
59

Optimistic locking: prevent version increment on entity collection attribute

Hello, I have an entity E with an attribute which is a collection of entities (one to many ... the increment of the version of entity E when entities are added to or removed from the collection ... Farid Oudjane If it is a bidirectional relationship that is owned by the entities in the collection
59

Entity listener - event instead of object

Hi, Currently I'm playing with entity listener to implement auditing with difference between values in updated entity. There is a problem however with accessing "old" version of object stored in ... store separate entity for given event. Right now I'm using BaseEntity which contains
58

Weird behaviour with enhanced classes and embedded entities

entries of my ArrayLists with embedded entities are missing. I've hunted the problem down to an enhanced/proxied list in my entity which contains embedded entities and some .add(obj) are simply failing ... .CascadeType; import javax.persistence.Embeddable; import javax.persistence.Entity; import javax
12

Database Schema Evolution

Modifications to entity classes that do not change their persistent field definitions (their schema ... of an entity class are detected by ObjectDB. New entity objects have to be stored in the new class schema, and old entity objects, which were stored previously in the old class schema
12

Paths and Types in JPQL and Criteria API

Instances of user defined persistable classes (entity classes, mapped super classes and embeddable ... . For example - c.capital, where c represents a Country entity object uses the capital persistent field in the Country class to navigate to the associated Capital entity object. Path expression whose type
11

Literals in JPQL and Criteria Queries

. 'abc'), enum literals (e.g. mypackage.MyEnum.MY_VALUE) and entity type literals (e.g. Country). JPQL ... } Then example.ui.Color.RED is a valid literal in JPQL, but Color.RED is not. Entity Type Literals Entity type literals represent entity types in JPQL, similar to the way that java.lang.Class instances in
11

Apache License, Version 2.0, January 2004

of this document. "Licensor" shall mean the copyright owner or entity authorized by the copyright owner that is granting the License. "Legal Entity" shall mean the union of the acting entity and all other entities that control, are controlled by, or are under common control with that entity

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ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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