24.1.30. @Id

<div class="paragraph">

The [`@Id`](http://docs.oracle.com/javaee/7/api/javax/persistence/Id.html) annotation specifies the entity identifier.
An entity must always have an identifier attribute which is used when loading the entity in a given Persistence Context.

</div>
<div class="paragraph">

See the [Identifiers](#identifiers) section for more info.

</div>
</div>
<div class="sect3">