Chapter 4. Persistent ClassesPersistent classes are classes in an application that implement the entities of the business problem (e.g. Customer and Order in an E-commerce application). Not all instances of a persistent class are considered to be in the persistent state. For example, an instance can instead be transient or detached.https://docs.jboss.org/hibernate/orm/3.3/reference/en/html/persistent-classes.html#persistent-classes-pojo-identifier
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