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About PESSIMISTIC_WRITE

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JPA Doc
4

lock(entity, lockMode, properties)

with the specified lock mode type and with specified properties. If a pessimistic lock mode type ... , the OptimisticLockException will be thrown. If the lock mode type is pessimistic and the entity instance is found ... - if the entity does not exist in the database when pessimistic locking is performed
JPA Doc
4

find(entityClass, primaryKey, lockMode)

context and the lock mode type is pessimistic and the entity has a version attribute, the persistence ... , the OptimisticLockException will be thrown. If the lock mode type is pessimistic and the entity ... OptimisticLockException - if the optimistic version check fails PessimisticLockException - if pessimistic locking
JPA Doc
4

find(entityClass, primaryKey, lockMode, properties)

there. If the entity is found within the persistence context and the lock mode type is pessimistic ... will be thrown. If the lock mode type is pessimistic and the entity instance is found but cannot be locked ... OptimisticLockException - if the optimistic version check fails PessimisticLockException - if pessimistic locking fails
JPA Doc
4

find(entityClass, primaryKey, lockMode, properties)

is pessimistic and the entity has a version attribute, the persistence provider must perform optimistic ... will be thrown. If the lock mode type is pessimistic and the entity instance is found ... OptimisticLockException - if the optimistic version check fails PessimisticLockException - if pessimistic
JPA Doc
4

javax.persistence.Query

- if a lock mode has been set and there is no transaction PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking ... mode has been set and there is no transaction PessimisticLockException - if pessimistic locking
Forum
3

"Attempt to lock a non entity object" error

(),       LockModeType.PESSIMISTIC_WRITE); . . } //doEdit ... );         em.lock(p, LockModeType.PESSIMISTIC_WRITE);         System.out.println("After find ... ();         // next line throws IllegalArgumentException         em.lock(p, LockModeType.PESSIMISTIC
JPA Doc
3

javax.persistence.PessimisticLockScope

property for pessimistic locking. This property may be passed as an argument to the methods ... the default behavior for pessimistic locking. This value defines the default behavior for pessimistic
JPA Doc
3

refresh(entity, lockMode)

, and lock it with respect to given lock mode type. If the lock mode type is pessimistic and the entity ... PessimisticLockException - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails and only the statement is rolled back PersistenceException - if an unsupported lock call is made Since: JPA 2.0
JPA Doc
3

refresh(entity, lockMode, properties)

properties. If the lock mode type is pessimistic and the entity instance is found ... - if pessimistic locking fails and the transaction is rolled back LockTimeoutException - if pessimistic locking fails and only the statement is rolled back PersistenceException - if an unsupported lock call is made Since: JPA 2.0
Manual
3

Chapter 1 - Quick Tour

This chapter demonstrates basic ObjectDB and JPA concepts by introducing a simple example program. After reading this chapter you should be able to write basic programs that create, open and close ObjectDB databases and perform basic CRUD operations (Create/Store, Retrieve, Update and Delete