63 | First query before any of the object has been storedI have some code that, before writing an object via ObjectDB makes a query to ensure the new object is different from what's already stored. The problem is that, before any instances of that object ... other persistence related exception. How can I know if any of an object has been stored |
63 | Detaching objects after JOIN FETCHHi, I have a question about detaching objects after issuing query with JOIN FETCH. Let's say I ... : 1. When not using mappedBy, like in example above, detached objects are visible even after closing em. 2. When using mappedBy in class B (this is the case in my code), detached objects from relation |
63 | EntityManagerFactory objects being locked during EntityManager creationIssue Details : We've been observing lately an issue with ObjectDB wherein the EntityManagerFactory objects are being locked during EntityManager object creation. Please refer the below stacktrace ... wherein the EntityManagerFactory objects are being locked during EntityManager object creation. This is the normal behavior |
63 | Query can't see recently persisted object does not appear to present a read consistent view of persisted objects within the same transaction. e ... . However if I call flush() on the EntityManager after the persist() the object will be found. Clearly ... the transaction. Is there a way of using or configuring ObjectDB to ensure read consistency of objects persisted |
62 | ObjectDB 2.6.9_06 (embedded): Cascading merge resulting in duplicate objects this class. If I load a NaturalPerson entity from the database, then add a new address to the object's "addresses" list and use EntityManager.merge(object) to persist it along with the new address ... "EntityManager.persist(object)" instead, only one Address entity is created (as expected). Am I |
62 | Changing existing objects from Entity to Embedded-only, made a migration utility which read the original objects, converted them to the new classes and stored ... . Is the change of not-embedded to embedded supported by ObjectDB for existing objects? If it is, do I ... (entity classes) or embeddable. To use embedded objects you must declare classes as embeddable |
62 | How to define database structure and insert some initial objects from scratch the initial database structure of our application? We know objectdb is all about objects and probably doesn't ... . That code, however, could be simple. Just build your entity objects and persist them. e.g. public class ... = emf.createEntityManager(); // Store 1000 Point objects in the database: em |
62 | Embedding Managed Entities in Embedded Objects = bad ideaDiscovered that you can't embed entities in embeddable objects if the entity is managed. Haven't tried embedding un-managed entities in embeddable objects, though I imagine that's not a great idea. The the error message isn't all that obvious (attempting to persist object which already has an id |
12 | Sort of very large objects - out of memory the following actions: 1) Create 5 persist threads which create and persist a large object in a loop 100 times each 2) Create 5 get threads which read 100 objects each in a loop based on object ... objects. This requires a fix, but meanwhile, adding a composite index can solve the problem: @Entity |
12 | New entity objects are duplicated on merge cascadingWhen merge is cascaded to a new entity object that has not been persisted ... to persist a reference to a non managed ..." exception, when the duplicated object is referenced from another new / dirty entity object by a reference with cascading persist disabled. The following test |
