Join tables are good when you want to avoid null values

When should you use @OneToOne with @JoinTable in Spring Data JPA?

@JoinTable gives you the best of both worlds because you can both allow null values AND not store them :)

A @OneToOne relationship is self explanatory (at least on the surface level). One customer has one address. One author has one book..

But using the JPA @OneToOne annotation specifically means that you are utilizing an ORM provider (like Hibernate) under the hood to implement the code/logic for creating tables, relationships (foreign keys, primary keys) so that you don't have to worry about it.

JPA defines runtime annotation interfaces like @OneToOne. It is up to the ORM providers (like Hibernate) to implement this. At runtime, Hibernate will generate the code you need to generate the tables you need.

How does a @OneToOne relationship work in Spring Data JPA?

Can someone explain the difference between Java SE and EE..what is the REAL difference there in terms of which one is better and what you get etc.

Well. My company standard it's openJDK 8 since 2019... Cheers!

juanrios.com@localhost

thank you, I finally realize that Java 8 is the most popular version.

Evgeny Ivanov

Alexander Joseph

A discussion surrounding the different versions of Java including the difference between SE and EE as well as key features of Java 7, 8, and 9.

Amanda Waters

Join tables are good when you want to avoid null values

<span class='code-bite'>@JoinTable</span> gives you the best of both worlds because you can both allow null values AND not store them :)

A <span class='code-bite'>@OneToOne</span> relationship is self explanatory (at least on the surface level). One customer has one address. One author has one book..

Can someone explain the difference between Java SE and EE..what is the REAL difference there in terms of which one is better and what you get etc.