@idclass vs @embedable

1. @Idclass


@Entity @IdClass(ProjectId.class)
public class Project {
    @Id int departmentId;
    @Id long projectId;
     :
}


Class ProjectId {
    int departmentId;
    long projectId;
}


2.@embedable


@Entity
public class Project {
    @EmbeddedId ProjectId id;
     :
}


@Embeddable
Class ProjectId {
    int departmentId;
    long projectId;
}



Ref: https://www.objectdb.com/java/jpa/entity/id









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