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"Mapping RelationShip State" in chapter 8

 
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Hello,
in chapter 8 and exactly in the part "Mapping RelationShip State", you use @idClass. Whereas in my code I use @Embeddable and @EmbeddedId I thus seek a solution with my problem of joint for the following code:




I have the error message according to
,
thank you in advance
 
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