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<td class="text-paragraph-pattern-container mobile-resize-text " style="padding: 0px; border-collapse: collapse; padding: 0 0 10px 0; padding-top: 10px"> <span class="diffcontext">PLs add into documentation <br />5.1.2.1. Composite identifier<br /><br />You can define a composite primary key through several syntaxes:<br /><br />use a component type to represent the identifier and map it as a property in the entity: you then annotated the property as @EmbeddedId. The component type has to be Serializable.<br />map multiple properties as @Id properties: the identifier type is then the entity class itself and needs to be Serializable. This approach is unfortunately not standard and only supported by Hibernate.<br />map multiple properties as @Id properties and declare an external class to be the identifier type. This class, which needs to be Serializable, is declared on the entity via the @IdClass annotation. The identifier type must contain the same properties as the identifier properties of the entity: each property name must be the same, its type must be the same as well if the entity property is of a basic type, its type must be the type of the primary key of the associated entity if the entity property is an association (either a @OneToOne or a @ManyToOne).<br />As you can see the last case is far from obvious. It has been inherited from the dark ages of EJB 2 for backward compatibilities and we recommend you not to use it (for simplicity sake).<br /><br />Let's explore all three cases using examples.<br /><br /><br /><br />*That two level nested PK is not working.</span> <span class="diffaddedchars" style="background-color:#ddfade;"> Till fixed this bug report</span> <span class="diffcontext">*</span>
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