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What role is the JDO in ObjectDB?

Mike Keith believe the JDO is out of date. Then what role of JDO in ObjectDB? Will our codes with JDO be out of date? Due in part to some of the failures of the EJB persistence model, and some ... . Once the EJB 3.0 persistence movement was in motion, however, and the major vendors all signed

Update is ignored by ObjectDB

. @EJB SMDB lib; ... Order orderInfo = lib.fulfilOrder(orderID, userID,itemID ... for me everywhere except commit transactions in different entity managers. I think that this problem is related to EJB

use of Singleton into tomcat

hi all. i would write a class singleton that encapsulate the entitymanagerFACTORY into it.(the entitymanagerFactory IS A property of the only instance of class singleton. (the class singleton is not a Ejb!!!!!!!!!). into tomcat it not possible use ejbs............. i have to manage the concurrency

@ElementCollection Set<Integer> is emptied sometimes

the class that does that, a @Singleton EJB, plus the affected entity. zmirc Mircea Chirac

Jboss 6 persistence.xml startup error

Hi, I'm trying to migrate a small EJB 3.1 project from Postgres to ObjectDb to test out feasibility, but I keep getting stuck on setting up the persistence.xml on JBoss 6 AS. Here is my setup: <persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http

Attempt to begin a new transaction when a transaction is active

to the database in order to persist records. For example : @EJB RecordDao recordDao; recordDao

What are the steps of creating small web app?

, JSP, EJB, JMS, JPA, JDBC,Security, Ajax using Primefaces. # Backend technologies: MYSQL, SQLite

Does ObjectDB create one instance of each entity class on (web app) load ?

across the system. Most of my EJB methods for querying are configurable with a pre-detach loader that "visits" any data

Problem with distinct select, order by and equivalent alias/attribute path

9 using JPA and JTA (EJB 3.1 etc.). Where would you recommend to set this property? I tried to set

Query can't see recently persisted object

When using container managed transactions (EJB) in Payara 4.1.3 with ObjectDB embedded, ObjectDB does not appear to present a read consistent view of persisted objects within the same transaction. e.g. in the following code the NoResultException is correctly thrown on the first occasion

Getting Started

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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