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java.nio.channels.OverlappingFileLockException

.wicket.RequestCycle.step(RequestCycle.java:1329) at org.apache.wicket.RequestCycle.steps ... locking conflict. In embedded mode the database cannot be opened by more than one user (process / class loader) simultaneously. Please verify that the database is not open by another process - e.g
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JPA and handling large data sets

. But exporting large binary data sets is very slow. To avoid memory problems the binary data type is read step by step during the export with the  query/setFirstResult() & setMaxResults(). But for large data ... results ordered by the primary key, use the value of the primary key of the last object in one batch as
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2

Performance and memory usage of queries

.Persistence; import javax.persistence.Query; public class MemoryUsageOfQuerys { static int steps ... .merge(myEntity);    for (int m = 0; m < steps; m++) {     MyEntityElement myEntityElement = new ... message we get by the example: [ObjectDB 2.6.1_01] Unexpected exception (Error 990)   Generated by
Manual
2

Detached Entity Objects

Detached entity objects are objects in a special state in which they are not managed by any ... ). Retrieval by navigation from detached objects is not supported, so only persistent fields ... EntityManager. In addition, in JPA 2 we can detach an entity object by using the detach method: em.detach
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2

Difficulty with the BIRT plugin

step by step tutorial, that explains how exactly to create the data set. If you follow the tutorial ... Explorer, as suggested in the online manual: Open the [New Data Set] dialog box by right clicking the Data
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2

Replication not working anymore

yet how exactly to reproduce this issue. Could you please provide step by step instructions ... it. It converts my *.odb to *.odb_nonclosed Sorry for the late reply. I got it to work again by
Manual
2

FROM clause (JPQL / Criteria API)

at the WHERE clause level by using a type expression. For example, in the following query, c iterates ... , and the same query can also be written as follows: SELECT c FROM Country c By default, the name ... name). The default name can be overridden by specifying another name explicitly in the @Entity's
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2

Shared (L2) Entity Cache

an entity object that is already managed by the EntityManager returns the existing instance from ... by the EntityManagerFactory and shared by all its EntityManager objects. the broader scope ... is wider, since they exist per database and are shared by all the EntityManagerFactory and EntityManager
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2

CM Transaction Implementation

Hi All, How to implement Container Managed Transaction using Glassfish / Weblogic server. Please provide us the step by step instruction, how ti achieve it       Please check the following tutorial: http://www.objectdb.com/tutorial/jpa/ee umesh
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2

New Tutorial: Using BIRT with ObjectDB/JPA

Version 2.2.7 of ObjectDB added support of report generation using the popular open source Business Intelligence and Reporting Tools (BIRT). The new Report Generation with BIRT and JPA tutorial provides step by step instructions on how to use BIRT to produce reports based on data in an ObjectDB database.