About Persistence Context

forum_thread

Intermittent: "Attempt to reuse an existing primary key value" when persisting a new instance

Hi,   I don't have a useful test case to expose this issue, but I am getting an intermittent "Attempt to reuse an existing primary key value". In this particular instance, the error is: ... Use ctrl + right click to open the browser context menu in the editing area (e.g. for using a browser spell ...

 
manual

Updating JPA Entity Objects

Explains how to use JPA to delete (remove) entity objects from the database.... that are stored in the database is based on transparent persistence, which means that changes are detected and handled automatically. ... Interface used to interact with the persistence context. See JavaDoc Reference Page... 's method is invoked to ...

 
forum_thread

Package name for persisted entities

Hi, I have a question about package name and searching for entities. As for now we were using two different databases for two different parts of our system. But we want to make a 'common' model for both systems. After merging entities from two different projects, we get single jar with all entities. Unfortunately some of the names are the same for entities: - homplex.model.dbobject.Inspiration - pl.hplxtool.model.Inspiration ... is that even if I specify full name with package in persistence.xml and set "exclude-unlisted-classes" for true, ODB is looking for ... Use ctrl + right click to open the browser context menu in the editing area (e.g. for using a browser spell ...

 
forum_thread

@Transient

Hello, I have a persistent class which looks something like this: @Entity public class Test { private String string; private Date date; @Transient private boolean test; // getters/setters } When I persist the class the transient 'boolean test' is stored in the database, maybe I am doing it wrong but I expect...   my persistence class screenshot of explorer after persistence class ... Use ctrl + right click to open the browser context menu in the editing area (e.g. for using a browser spell ...

 
forum_thread

Visibility of changes in Transaction is not visible to a JPA QL Query

I have two simple Entities ( see attachment ) and a simple SLSB with container managed transactions which is called by a trivial servlet. Inside a UserTransaction I add a number of items then check to see that they have been added ... = - 1 ; try { InitialContext context = new InitialContext ( ) ; javax. ... ) ; } catch ( javax. persistence . NoResultException ex ) { return - ...

 
forum_thread

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: ------- Start persistence.xml ------- ... 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 = ... defined a jta-data-source for a JTA enabled persistence context named: testUnit at ...

 
issue

Weird issue with variable naming

hi, ... java. util . Map ;   import javax. persistence . CascadeType ; import javax. persistence . ... Use ctrl + right click to open the browser context menu in the editing area (e.g. for using a browser spell ...

 
manual

SELECT clause (JPQL / Criteria API)

Explains how to use the SELECT clause and projections in a JPA/JPQL query.... that become managed by the EntityManager javax.persistence.EntityManager JPA interface Interface used to interact with the persistence context. See JavaDoc Reference Page... em : TypedQuery ...

 
api-jpa

merge(entity)

Merge the state of the given entity into the current persistence context.(Method of javax.persistence.EntityManager)

 
forum_thread

can't get HashMap out of the database

I'm trying to persist an Entity containing a HashMap. It stores the data in the database OK, but the map is always empty when I get the entity out of the database again. I've reproduced this problem in a simple variation of the Guestbook tutorial: Guest class: ===================== ... ) { ClassPathXmlApplicationContext context = new ClassPathXmlApplicationContext ( ... are available, unless you use a Container-managed Extended Persistence Context, as discussed in this forum thread . In ...