[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-4042) StatelessSession does not flush when using jdbc batch_size > 1

StatelessSession does not flush when using jdbc batch_size > 1 -------------------------------------------------------------- Key: HHH-4042 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4042 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.3.1 Environment: JBoss 4.2.3, Linux, java 1.6, hibernate 3.3.1, entityManager 3.4.0, jboss seam 2.1.2, postgresql 8.3 Reporter: Gael Beaudoin I'm using a StetelessSession to insert millions of rows : it works great and without using much memory. But I've just seen that with a jdbc batch size of 50 for example (<property name="hibernate.jdbc.batch_size" value="0"/> in my persistence.xml) the last round of inserts aren't flushed to the database. For example, with 70 insert, only the first 50 are sent to the database. I've searched a lot about this issues and on this thread (https://forum.hibernate.org/viewtopic.php?f=1&t=987882&start=0), the only solution found is to set the batch_size to 1, which is really a shame. I've tried to flush the session, close the jdbc connection, etc etc ... no luck. I'd be fine with a way to set the batch_size to 1 only for this method, pro grammatically, but I've not found any way to do that. If you don't pay attention, it's a easy way to lose data.