Prompt Detail:
This is a Java interface for a Product Service (SVC). The interface declares several methods for performing CRUD (Create, Read, Update, Delete) operations on Product objects, as well as a method for checking if a product exists.
The save method is used for registering a new product and returns the ID of the newly created product. The findById method is used to retrieve a Product object by its ID and returns an Optional object that may or may not contain the Product.
The update method is used to
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