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1

Internal error

. It seems to be related to an an attempt to retrieve an entity object that is part of the query results ... after the exception was thrown? The exception at #1 was thrown during an attempt to retrieve an object in a query ... was thrown during an attempt to retrieve an object in a query result, which was not found in the database
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1

JBOSS AS7 7.1.1 - Entity not persisted and createNamedQuery fire exception

);   findAllGuests();     }     // Retrieves all the guests:     public List getAllGuests ... );     }     // Retrieves all the guests:     public List getAllGuests() {         TypedQuery query = em ... () );   if ( persistedGuest == null ) {    this.em.persist(guest);   }     }     // Retrieves all the guests
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1

Optimistic locking: prevent version increment on entity collection attribute

when the object is retrieved. Hello, thank you for your reply. I have added some code to re-retrieve ... with a new EntityManager (or cleared one) should re-retrieve the original collection of readings
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1

Project runs in Eclipse but not when exported to runnable jar

of a model glider. I decided to use objectdb as a way to persist the values for later retrieval ... running the system through eclipse. The full retrieval is not yet implemented, I concentrated on understanding the basics before working out how to effeciently commit and retrieve the main data. I'm
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1

Server closes if large query runs out of memory

. ObjectDB surely has some idea of the sizes of objects that it persists and retrieves, and so should be able to fail safely if it finds too many objects being retrieved to fit into memory ... retrieval, whereas perhaps JDO deletion does.  Would using JPA for large deletions be less demanding
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1

Slow searching with two indexes

2] Retrieve fields in NmeaBatch (this) instances. [Step 3] Order the results of step 2 by ... because of the need to retrieve timeReceived value for a lot of objects. Unfortunately the fact that only 10 results ... . This will allow execution of this query purely with the new index with no need for further data retrieval
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1

Speed of queries that return many objects

how retrieving something from a DB works is as follows: 1/ load from the disk - the odb file size ... is stored in a secondary storage and only portion of that data is retrieved to memory at a time ... (optionally using embedded objects) or by retrieving the data without the entity objects using "report queries
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1

system exception occurred during an invocation on EJB GuestDao

.lang.IllegalStateException: Unable to retrieve EntityManagerFactory for unitName null at com.sun ... (Thread.java:744) Caused by: java.lang.IllegalStateException: Unable to retrieve ... : Unable to retrieve EntityManagerFactory for unitName null You may have missed one of the tutorial
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1

Transaction isolation support?

objects). Therefore, if an entity object is retrieved by one EntityManager and then updated in ... A.   It depends when the list of books is retrieved by A. If the collection is owned by User (i.e. not mapped by, as you wrote), then it is part of the User object, and will be retrieved with the User
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1

Update Entity references if we change the type of an entity

) rather than just an id. This enables faster navigation between objects, as retrieval of an object ... : System.setProperty("objectdb.temp.extended-ref-retrieval", "true");             // or by using the -D JVM argument When this option is enabled retrieval of objects by a reference accepts the expected type as