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3.2. Making objects persistent

Once you've created a new entity instance (using the common new operator) it is in the new state. You can make it persistent by associating it to an entity manager:
DomesticCat fritz = new DomesticCat();
If the DomesticCat entity type has a generated identifier, the value is associated to the instance when persist() is called. If the identifier is not automatically generated, the application-assigned (usually natural) key value has to be set on the instance before persist() is called.