According with the documentation:

You can define a composite primary key through several syntaxes:

* annotate the component property as @Id and make the component class @Embeddable
* annotate the component property as @EmbeddedId
* annotate the class as @IdClass and annotate each property of the entity involved in the primary key with @Id


Should I use @IdClass ? Is it better in what situation ?
What is the difference between annotate with @IdClass and the others?

Thanks in advance!