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How does the EJB Container (Persistence Manager) manage the locking?

April 26, 2017container EJB locking manage manager Persistence

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How does the EJB Container (Persistence Manager) manage the locking?

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Persistence Manager uses only pessimistic concurrency control based on different isolation levels and locking in Enque server or in the database. If you have a read-only CMP bean it is better to specify this when describing its O/R mapping in persistent.xml descriptor. Thus you will escape any locking for that bean and will increase the performance.