About persistence unit

manual

JPA Persistence Unit

Explains how to define a JPA persistence unit in the persistence.xml file. A JPA Persistence Unit is a logical grouping of user defined persistable classes (entity classes, ... and mapped superclasses) with related settings. Defining a persistence unit is optional when using ObjectDB, but required by JPA. ...

 
tutorial

Step 2: Entity Class and Persistence Unit

Explains how to define a JPA entity class and a persistence unit (persistence.xml) in a NetBeans Spring MVC web application project.... New > Entity Class ... (or  New > Other... > Persistence > Entity Class and clicking  Next ). Enter Guest as ... persistence.xml file with a default persistence unit (that will be configured later). If the Finish button is disabled fill ...

 
tutorial

Step 2: Entity Class and Persistence Unit

Explains how to define a JPA entity class and a persistence unit (persistence.xml) in a NetBeans Java EE 6 web application.... New > Entity Class ... (or New > Other... > Persistence > Entity Class and clicking Next ). Enter ... persistence.xml file with a default persistence unit (that will be configured later). If the  Finish button is ...

 
tutorial

Step 2: Entity Class and Persistence Unit

Explains how to define a JPA entity class and a persistence unit (persistence.xml) in an Eclipse Spring MVC web application project.... import java. sql . Date ; import javax. persistence . Entity ; import javax. persistence . GeneratedValue ; import javax. persistence . Id ... >   <persistence-unit name = "GuestbookPU" transaction-type = "RESOURCE_LOCAL" ...

 
tutorial

Step 2: Entity Class and Persistence Unit

To store objects in an ObjectDB database using JPA we need to define an entity class:... import java. sql . Date ; import javax. persistence . Entity ; import javax. persistence . GeneratedValue ; import javax. persistence . Id ... >   <persistence-unit name = "GuestbookPU" transaction-type = "JTA" > ...

 
manual

Database Connection using JPA

Describes the main JPA interfaces: EntityManagerFactory, EntityManager and EntityTransaction. Working with the Java Persistence API (JPA) consists of using the following interfaces: This ... is represented by an EntityManager javax.persistence.EntityManager JPA interface Interface used to interact ... with the entity manager factory for the persistence unit. See JavaDoc Reference Page... instance is to support ...

 
manual

Chapter 2 - JPA Entity Classes

Explains how to define and use JPA entity classes and other JPA persistable types.... Definition Database Schema Evolution JPA Persistence Unit ...

 
manual

Storing JPA Entity Objects

Explains how to use JPA to store (persist) entity objects in the database.... the object with an owner EntityManager javax.persistence.EntityManager JPA interface Interface used to interact ... version = "1.0" > <persistence-unit-metadata > <persistence-unit-defaults > ...

 
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The project does not contain a persistence unit

How do I fix this error/warning that Netbeans gives me?   ... ObjectDB itself does not require a persistence unit, but NetBeans produces this warning because a persistence unit is required ...

 
forum_thread

Exception while accessing the Persistence unit ...?

Hi, I am new to ObjectDB I was trying your eclipse/jee6/glassfish tutorial. I am getting the following exception: ... me ? The only change I did to the code was add the unit name to the DAO class: (if I remove it then the exception thrown is ... 06:55 Maybe the persistence.xml file has an error or maybe it is located in the wrong ...