AnnotationException: A Foreign key refering has the wrong number of column. should be 2

by

Your class CiudadPK has two columns in it. You’re only using @JoinColumn which is limited to a single column. You need to use @JoinColumns and list out both columns in the FK, e.g.

// bi-directional many-to-one association to Provincia
@ManyToOne(fetch=FetchType.LAZY)
@JoinColumns({
  @JoinColumn(name = "codProvincia", insertable = false, updatable = false),
  @JoinColumn(name = "codRegion", insertable = false, updatable = false)
})
private Provincia provincia;

You’ll likely have the other issue w/ Ciudad as well, please follow the pattern here to correct that one.

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