How to make a @ManyToOne field mandatory in JPA2?

Question

I am designing the persistence repository for an app.

I am new to Hibernate+JPA2 and I am having trouble creating more complex relationships

Answer 1

You have to use @JoinColumn(name=..., nullable=false) not @Column

See the complete API

Answer 2

Or you can just use @NotNull from javax.validations.constraints package.

Answer 3

It should be enough to just use @ManyToOne(optional = false)