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Hi, Im Thorben Janssen from thoughts-on-java.org with a new Hibernate Tip. When youre working with legacy databases, you probably had the situation that you had to map a many-to-one association that used a non-primary key column on the to-one side. You can easily map that with a JoinColumn annotation. It allows you to reference any column that contains unique values, For example, a natural id. Lets take a look at an example I adapted my usual bookstore example. It consists of a Book and a Review entity. Each Review belongs to one Book, and eachBookmight have been reviewed multiple times. That is a typical one-to-many association. When you create the table model, you normally use the primary key columnidof thebooktable as the foreign key in the review table. But in this example, I want to use the isbn of the Book instead. You typically define a one-to-many association with a ManyToOne annotation on the entity that models the to-many site. So, in this case, on the Review entity.