About PESSIMISTIC_WRITE

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Optimistic lock failed

If you must avoid optimistic lock exceptions you can use pessimistic exceptions ... ="write" />                  ... This is currently an undocumented
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Some technical questions

fetch this object without blocking? Yes, if it has not been locked with pessimistic WRITE
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javax.persistence.EntityNotFoundException

with pessimistic locking is used and the entity no longer exists in the database. The current transaction
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javax.persistence.LockTimeoutException

: Serializable Thrown by the persistence provider when an pessimistic locking conflict occurs that does
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javax.persistence.PessimisticLockException

Interfaces: Serializable Thrown by the persistence provider when an pessimistic locking conflict occurs
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PessimisticLockScope.NORMAL

Enum Constant javax.persistence.PessimisticLockScope NORMAL This value defines the default behavior for pessimistic locking. The persistence provider must lock the database row(s) that correspond to the non-collection-valued persistent state of that instance. If a joined inheritance strategy
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javax.jdo.identity.ByteIdentity

 out) Write this object. Write this object. Write the superclass first. Parameters: out - the output
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javax.jdo.identity.CharIdentity

form of the key Since: JDO 1.0 void writeExternal(ObjectOutput out) Write this object. Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0 void readExternal
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javax.jdo.identity.IntIdentity

. Returns: the String form of the key Since: JDO 1.0 void writeExternal(ObjectOutput out) Write this object. Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1.0
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javax.jdo.identity.LongIdentity

of the key. Returns: the String form of the key Since: JDO 1.0 void writeExternal(ObjectOutput out) Write this object. Write this object. Write the superclass first. Parameters: out - the output Since: JDO 1