About @Id

forum_thread

@OneToOne query issue with OR and IS NULL

Hello, I'm struggeling to get a query run right. I have 2 entities (simplified) #1 2015-06-29 11:49 Hello, I'm struggeling to get a query run right. I have 2 entities (simplified) class A ...

 
forum_thread

Entity with java.util.Date column gives ClassCastException in BIRT

Copied a straightforward entity class from my coleague. Using Eclipse Kepler (Reporting) and stored it in ObjectDB 2.5.3_02. After creating an ObjectDB BIRT DataSource and a DataSet, entered a simple JPQL query to select the fields. Entity looks like this: #1 2013-10-08 07:45 Copied a straightforward entity class from my coleague. Using Eclipse Kepler (Reporting) and stored it in ObjectD ...

 
forum_thread

Multi part paths in a composite index must have the same length

Hi, I am trying to create some index in a DB - but I get an exception when i try to commit. Exception in thread "main" [ObjectDB 2.6.0_01] javax.persistence.PersistenceException Invalid index path 'tStamp.value / instrumentId' in type Entities.OrderBookNew (error 328) at com.objectdb.jpa.EMImpl.createQuery(EMImpl.java:958)   Here is how the class of the persisted object looks like #1 2015-01-15 03:15 Hi, I am trying to create some index in a DB - but I get an exception when i try to commit. Excepti ...

 
manual

Auto Generated Values

Explains the different strategies for generating auto values (mainly for primary key fields) in JPA.... public class EntityWithAutoId1 { @Id javax.persistence.Id JPA annotation Specifies the primary ... public class EntityWithAutoId2 { @Id javax.persistence.Id JPA annotation Specifies the primary ...

 
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: ===================== #1 2011-11-04 09:35 I'm trying to persist an Entity containing a HashMap. It stores the data in the database OK, but the map is a ...

 
forum_thread

How do I achieve a Deep Fetch using JOIN FETCH?

I have an Entity type which is contains a collection of Embeddable objects, which in turn themselves contain a collection of Embeddable objects: @Embeddable class A { String val; }; @Embeddable class B { List<A> aList; }; @Entity class C { @Id long id; List<B> bList; };   Usually I'm content to have the B's and A's be lazily loaded, but I have a circumstance where I need to be able to work with the whole C object, with all its parts, as a detached object. #1 2013-03-27 03:07 I have an Entity type which is contains a collection of Embeddable objects, which in turn themselves contain a co ...

 
issue

NullPointerException when using multithreading

[ObjectDB 2.4.4_08] Unexpected exception (Error 990)   Generated by Java HotSpot(TM) Client VM 1.6.0_29 (on Windows 7 6.1). Please report this error on http://www.objectdb.com/database/issue/new com.objectdb.o.InternalException: java.lang.NullPointerException: null java.lang.NullPointerException at com.objectdb.o.ENT.C(ENT.java:557) at com.objectdb.o.OBM.bz(OBM.java:385) at com.objectdb.o.OBM.bz(OBM.java:261) at com.objectdb.jpa.EMImpl.persist(EMImpl.java:377) at ... Bug Version: Priority: Normal Status: Fixed Replies: 8 Type:  Bug ...

 
forum_thread

Extra uninitialised entities spawned on merge()

In the following, Element is a base entity class, with a bi-directional @ManyToOne-@OneToMany relationship Element owner - List<Element> ownedElements, and Example is a subclass entity with a relationship @OneToOne Element child. #1 2012-06-05 03:25 In the following, Element is a base entity class, with a bi-directional @ManyToOne-@OneToMany relationship Elem ...

 
forum_thread

Object as parameter results in exception

Hi,    I've got a simple JPA2 Criteria query which fails when doing an object equality. I verified this against EclipseLink and over there, it works. I'll Attach some code snippets to help figure it out:   @Entity() public class Product{ . . . @ManyToOne     private Compamy owningCompany; } @Entity() public class Company{    .    .    .     @Id    private Long id; } and the query: #1 2011-04-27 12:15 Hi,    I've got a simple JPA2 Criteria query which fails when doing an object equality. I v ...

 
page

ObjectDB Object Database Features

ObjectDB provides a rich set of features, many of them as the result of supporting the JPA and JDO APIs.... is an entity. See JavaDoc Reference Page... , @Id javax.persistence.Id JPA annotation Specifies the primary ... - primary key is automatically managed by ObjectDB with no @Id field. Simple primary key - a ...