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Hibernate Mapping Unsorted Set - HashSet

Today we are going to understand how to persist a collection object based on a Set collection interface i.e. HashSet, within the database using Hibernate. HashSet stores the collection of elements in an unsorted order.

Why do we have to add a collection object in an Entity class.

Let's suppose we have a class Companies containing the information such as - id, name and a Set collection of String object(representing names of all the employees of a particular company).
That's why we are going to need a collection object in Companies class, representing multiple employee names in a company.

Let's put this example to work and make it easier for you to understand the whole concept.

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