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16

OptimisticLockException

, which is that the optimistic lock exception fails repeatedly once the object is modified from another process. ie: process A modifies the object then process B modifies the object, then any further transactions from ... . do I understand correctly that if object x is modified and persisted by process B, then any attempt
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isDirty(pc)

Static Method javax.jdo.JDOHelper boolean isDirty( Object pc ) Tests whether the parameter instance is dirty. Instances that have been modified, deleted, or newly made persistent in the current ... instance has been modified in the current transaction. Since: JDO 1.0 See Also: javax.jdo.spi
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Persistent.persistenceModifier

Annotation Element javax.jdo.annotations.Persistent PersistenceModifier persistenceModifier Modifier for this field. This is normally not specified, and the defaults are used, or the @Transactional ... modifier Default value: javax.jdo.annotations.PersistenceModifier.UNSPECIFIED Since: JDO 2.1
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jdoPreStore()

Method javax.jdo.listener.StoreCallback void jdoPreStore() Called before the values are stored from this instance to the data store. Data store fields that might have been affected by modified non-persistent fields should be updated in this method. This method is modified by the enhancer
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javax.jdo.annotations.PersistenceModifier

: Serializable, Comparable<PersistenceModifier> Enumeration of the persistence-modifier values for a field or property. This corresponds to the "persistence-modifier" attribute of the "field
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setBooleanField(pc, field, currentValue, newValue)

Method javax.jdo.spi.StateManager void setBooleanField( PersistenceCapable pc, int field, boolean currentValue, boolean newValue ) Mark the field as modified by the user. Parameters: pc - the calling PersistenceCapable instance field - the field number currentValue - the current value of the field
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setCharField(pc, field, currentValue, newValue)

Method javax.jdo.spi.StateManager void setCharField( PersistenceCapable pc, int field, char currentValue, char newValue ) Mark the field as modified by the user. Parameters: pc - the calling PersistenceCapable instance field - the field number currentValue - the current value of the field newValue - the proposed new value of the field Since: JDO 1.0
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setByteField(pc, field, currentValue, newValue)

Method javax.jdo.spi.StateManager void setByteField( PersistenceCapable pc, int field, byte currentValue, byte newValue ) Mark the field as modified by the user. Parameters: pc - the calling PersistenceCapable instance field - the field number currentValue - the current value of the field newValue - the proposed new value of the field Since: JDO 1.0
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setFloatField(pc, field, currentValue, newValue)

Method javax.jdo.spi.StateManager void setFloatField( PersistenceCapable pc, int field, float currentValue, float newValue ) Mark the field as modified by the user. Parameters: pc - the calling PersistenceCapable instance field - the field number currentValue - the current value of the field
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setDoubleField(pc, field, currentValue, newValue)

Method javax.jdo.spi.StateManager void setDoubleField( PersistenceCapable pc, int field, double currentValue, double newValue ) Mark the field as modified by the user. Parameters: pc - the calling PersistenceCapable instance field - the field number currentValue - the current value of the field

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ObjectDB is very easy to use. Follow the Getting Started Tutorial and the Quick Tour manual chapter and in minutes you may be able to write and run first Java programs against ObjectDB.

Prior knowledge or experience in database programming (SQL, JDBC, ORM, JPA, etc.) is not required, but some background in using the Java language is essential.

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