I managed to fix it in the end by reading some really really old post
in the hibernate archive.
Effectively, if you define something, a class property that has no
initial value (in our case, _ ) then it bones the inserting for some
reason. Quite knows what it does that but it does...... and with very
little error as well :-(
For completeness sake, here is the final Author class:
@Entity
@Table(){val name="authors", val schema="dbo"}
class Author {
@Id
@GeneratedValue(){val strategy = GenerationType.IDENTITY}
@Column(){val insertable = false, val unique = true}
var id : Long = 100
var name : String = ""
@OneToMany(){val mappedBy = "author", val targetEntity =
classOf[Book]}
var books : java.util.Set[Book] = new java.util.HashSet[Book]()
}
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