How to name the foreign key constraint of ManyToOne references since JPA 2.1?

You're right, I misread the documentation. It can be defined as a part of @JoinColumn annotation.

It should look like that:

@JoinColumn(foreignKey = @ForeignKey(name = "FK_USER"))

Do you insert @JoinColumn(foreignKey = @ForeignKey(name = "FK_USER")) direct to mapped to entity example:

@ManyToOne
@JoinColumn(foreignKey = @ForeignKey(name = "FK_USER"))
private User user;

As the documentation indicates, this annotation can't be applied to anything:

@Target(value={})

It can thus only be used as part of another annotation (listed in the See Also section):

@JoinColumn(foreignKey = @ForeignKey(name = "FK_USER"))

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