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JPA Doc
7

javax.persistence.EntityManager

has a version attribute, the persistence provider must perform optimistic version checks ... mode other than NONE is specified OptimisticLockException - if the optimistic version check fails ... has a version attribute, the persistence provider must perform optimistic version checks when obtaining
FAQ
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Can I use ObjectDB with languages other than Java?

ObjectDB can be used by Java Virtual Machine (JVM) languages, such as Java, Groovy and Scala. It can also be used with other languages, such as Phyton, Ruby and PHP, but currently only with their JVM implementations (e.g. Jython for Phyton, JRuby for Ruby and Quercus for PHP). A version of ObjectDB
Manual
7

Chapter 4 - JPA Queries (JPQL / Criteria)

The JPA Query Language (JPQL) can be considered as an object oriented version of SQL. Users familiar with SQL should find JPQL very easy to learn and use. This chapter explains how to use JPQL as well as how to use the JPA Criteria API, which provides an alternative way for building queries in JPA
Manual
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Database Server

: ObjectDB Server [version 2.8.0] Copyright (c) 2019, ObjectDB Software, All rights reserved
Manual
7

Defining a JPA Entity Class

and what a version field is and how to use it. If you are already familiar with JPA
Tutorial
7

Getting Started with JPA

easily, even if you are completely new to JPA. This tutorial is available in the following versions
Manual
7

Index Definition

can only be defined on ordinary persistent fields (not on primary key / version fields). Composite Index A composite
FAQ
7

Is ObjectDB better than competing object databases?

for the Java Persistence API (JPA). It also supports a more recent and advanced version of the Java
Tutorial
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Java EE Web Tutorial

. This tutorial is available in the following versions: In addition the demonstrated application is available as a Maven project:
Manual
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JPA Lifecycle Events

/persistence/orm_1_0.xsd" version="1.0">