In this article, we will show you how to use Session.merge () method to merge an entity in Hibernate Application. PostgreSQL: Documentation: 14: 13.2. Transaction Isolation At the same time, it requires us to specify the mapping between Java objects and database tables. After updating my object via hibernate I called commit which resulted in hibernate search synchronizing our lucene indexes with the database. Chapter 5. Locking - JBoss She then decides to order it. Using Transactions (The Java™ Tutorials > JDBC Database Access - Oracle Locking refers to actions taken to prevent data in a relational database from changing between the time it is read and the time that it is used. A transaction is a sequence of operation which works as an atomic unit. The behavior defined by the isolation level of . Optimistic Locking In Optimistic Locking, the transaction doesn't lock the entity immediately. Hibernate Community • View topic - Using (NOLOCK) on SQL server queries The write-behind is more related to Hibernate flushing rather than any logical or physical transaction. Pessimistic Locking When we are using Pessimistic Locking in a transaction and access an entity, it will be locked immediately. Enabling Transaction Locks in Spring Data JPA | Baeldung 20.2 Hibernate Transaction Management. JBoss / Hibernate / BMP (CMT) / DB2 / JDBC - DB...| JBoss.org Content ... Optimistic locking is applied on transaction commit. In hibernate framework, we have Transaction interface that defines the unit of work. The problem as I understand is: This exception killed/rolled back our transaction and the exception was completely consumed by Hibernate during JDBCTransaction.commit. Hibernate does not lock objects in memory. A beginner's guide to database deadlock - Vlad Mihalcea