Problem: db connection cause a deadlock in the application Hello guys i have an application and work with Hibernate/Springmvc/SWF/Ajax, tomcat 5.5.20 jdk 1.5_09 Code: Implementation-Title: Hibernate3 Implementation-Version: 3.2.1.ga Implementation-Vendor: hibernate.org Hibernate-Version: . Specifically, it frees us from manually writing SQL statements. Your application can expect the behavior as defined by the isolation level of your database transactions. After updating my object via hibernate I called commit which resulted in hibernate search synchronizing our lucene indexes with the database. Your transactions should be whatever length they need to be for your atomic unit of work. This issue can be depicted as follows: Alice fetches a Product. But first let's review the possibilities of what can we use for dealing with this problem in usual database application. This is a guide to SQL LOCK TABLE. Many conditions can cause exceptions to be thrown while using Hibernate. Setup. 20.2 Hibernate Transaction Management. Hibernate oplocks. If you access detached objects that have been loaded in the Session inside your JSP (or any other view rendering mechanism), you might hit an unloaded . C reads and updates data. To avoid conflicts during a transaction, a DBMS uses locks, mechanisms for blocking access by others to the data that is being accessed by the transaction. Hibernate Transaction Management Example - javatpoint Resolution. each database object is locked separately. LockMode.NONE : Hibernate obtains this lock when a transaction finishes or during the start of a call to update() or saveOrUpdate(). Make sure you specify a transaction manager in your Spring Configuration (this you need to do anyway). Hibernate oplocks - PostgreSQL wiki If the connection is enlisted with a distributed transaction, operations performed by the ISession are . Any database object that has to be updated or . Remember opening a session will not open a connection with database which means opening a session is not expensive. Hibernate directly uses JDBC connections and JTA resources without adding any additional locking behavior. Hibernate Exception Overview. Batch Insert/Update with Hibernate/JPA - Baeldung PostgreSQL Locks and Table Lock Examples - ObjectRocket The SQL Server Database Engine uses schema modification (Sch-M) locks during a table data definition language (DDL) operation, such as adding a column or dropping a table. Locking an entire table by reading rows shouldn't happen in any full featured database written in this century. The write-behind is more related to Hibernate flushing rather than any logical or physical transaction. Hibernate merge can be used to update existing values, however this method create a copy from the passed entity object and return it. Hibernate Session merge, update, save, saveOrUpdate, persist example