Mac cuts this down to two: sleep and shut down. Windows offers three different options: sleep, hibernate, and shut down. New DefaultTransactionAttribute(TransactionDefinition.In order to make the most appropriate decision, it’s important to have a good understanding of what each of these options does. Private static final TransactionDefinition REQUIRES_NEW_TRANSACTION = ** transaction settings that suspend the existing transaction and start a new one that will commit independently */ You insert your batch processing logic inside the TransactionTemplate execute method.Ĥ2 import net.sf.hibernate.SessionFactory Using the native Hibernate and Spring library code, this amounts to the following code. this automatically "flushes the session", synchronising any changes made to Hibernate objects to the database, as well as committing those changes.In order to ensure you don't retain objects in the Hibernate session, you need to: The solution: how to ensure memory is released from Hibernate In various places in Confluence, we work around this with manual session and transaction management to limit the amount of memory needed for bulk operations. When you are dealing an operation on a large dataset, this means that the objects added or retrieved by Hibernate aren't eligible for garbage collection.
One significant problem with ORMs like Hibernate is that they, by design, keep a reference to objects retrieved from the database for the length of the session. These details of Hibernate are described below, a quick overview and sample code showing how to work around the problem in practice. Understanding the underlying mechanisms Hibernate uses to track state is critical to understanding how this manual session and transaction management works. For general information about dealing with Hibernate and Spring in normal situations, see the Hibernate Sessions and Transaction Management Guidelines.
This page describes the best practice for managing the Hibernate 2 flushing and clearing process when performing operations on large numbers of objects in Confluence. The guidelines mainly apply to Atlassian employees, but reading them should provide insight for third-party plugin developers as well, so we decided to make them public. These are guidelines related to the development of Confluence.
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