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In Hibernate I can create a unique key using @NaturalId on several properties of the entity.
Is there a JPA equivalent annotation, something that is a part of javax.persistence?
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Just like with the JPA @Id annotation, the @NaturalId allows you to fetch the entity if you know the associated natural key.
Let's start with the @Column annotation. It is an optional annotation that enables you to customize the mapping between the entity attribute and the database column.
Speaking precisely, Spring Data JPA is an add-on for JPA. It provides a framework that works with JPA and provides a complete abstraction over the Data Access Layer. Spring Data JPA brings in the concept of JPA Repositories, a set of Interfaces that defines query methods.
you can't use JPA on its own. JPA is a specification, which defines an API for object-relational mappings and for managing persistent objects and you need a JPA provider to implement it, like Hibernate, EclipseLink. Save this answer.
What I usually do is add a unique constraint on the columns, using @Table(uniqueConstraints = @UniqueConstraint(columnNames={column_1, ..., column_n}))
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