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Posted by / 11-Feb-2020 07:00

I understnad that in this instance, the merge() is called before refresh() is to attach the item entity to the persistence context and also that any method invocation on Entity Manager (like merge() or refresh()) will not get executed on the database straight away.I also understand that the merge() method is used to update the database from an object and the refresh() method is called to update and object from the databse. undo Item Changes() method), does the merge() method call will be over-written by the call to the refresh() method before they get executed on the database?The above sample code is from "EJB 3 in Action" book pages 303 and [email protected] public class Item Manager Bean implements Item Manager Within the undo Item Changes() method the entity Manager.merge() is called first on the item object before calling the entity Manager.refresh() method.The spec does not state that the id will be generated right away, regardless of the id generation strategy.The specification for the method allows the implementation to issue statements for generating id on commit or flush, and the id is not guaranteed to be non-null after calling this method, so you should not rely upon it.

For instance, suppose you have a RESTful interface with a method for retrieving an JSON-serialized object by its id to the caller and a method that receives an updated version of this object from the caller.You may call this method on an already , but it has different implementation details.The documentation for this method strictly states that it persists the instance, “first assigning a generated identifier”.Hibernate was the most successful Java ORM implementation.No wonder that the specification for Java persistence API (JPA) was heavily influenced by the Hibernate API.

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