Controlling concurrent access detected. This is the equivalent (Web hosts)
Controlling concurrent access detected. This is the equivalent of the native StaleObjectStateException in Hibernate and should be treated accordingly. We ve now covered the basic isolation levels of a database connection, with the conclusion that you should almost always rely on read-committed guarantees from your database. Automatic versioning in Hibernate and Java Persistence prevents lost updates when two concurrent transactions try to commit modifications on the same piece of data. To deal with nonrepeatable reads, you need additional isolation guarantees. 10.2.3 Obtaining additional isolation guarantees There are several ways to prevent nonrepeatable reads and upgrade to a higher isolation level. Explicit pessimistic locking We already discussed switching all database connections to a higher isolation level than read committed, but our conclusion was that this is a bad default when scalability of the application is a concern. You need better isolation guarantees only for a particular unit of work. Also remember that the persistence context cache provides repeatable reads for entity instances in persistent state. However, this isn t always sufficient. For example, you may need repeatable read for scalar queries: Session session = sessionFactory.openSession(); Transaction tx = session.beginTransaction(); Item i = (Item) session.get(Item.class, 123); String description = (String) session.createQuery(”select i.description from Item i” + ” where i.id = :itemid”) .setParameter(”itemid”, i.getId() ) .uniqueResult(); tx.commit(); session.close(); This unit of work executes two reads. The first retrieves an entity instance by identifier. The second read is a scalar query, loading the description of the already loaded Item instance again. There is a small window in this unit of work in which a concurrently running transaction may commit an updated item description between the two reads. The second read then returns this committed data, and the variable description has a different value than the property i. getDescription().
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