Hibernate saveOrUpdate behavior

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When you use .saveOrUpdate() Hibernate will check if the object is transient (it has no identifier property) and if so it will make it persistent by generating it the identifier and assigning it to session. If the object has an identifier already it will perform .update().

From the documentation:

saveOrUpdate() does the following:

  • if the object is already persistent
    in this session, do nothing
  • if another object associated with the
    session has the same identifier,
    throw an exception
  • if the object has no identifier
    property, save() it
  • if the object’s identifier has the
    value assigned to a newly
    instantiated object, save() it
  • if the object is versioned by a
    “version” or “timestamp”, and the
    version property value is the same
    value assigned to a newly
    instantiated object, save() it
    otherwise update() the object

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