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Description:
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This one is quite obscure, the problem is most likely in BinderHelper#createSyntheticPropertyReference().
A many-to-one foreign key association that doesn't reference a primary key, but a unique key:
{code}
@Entity
@Table(name = "USERS")
public class User {
@Id
@GeneratedValue
protected Long id;
@NotNull
@Column(unique = true)
protected String customerNr;
}
{code}
{code}
@Entity
public class Item {
@Id
@GeneratedValue
protected Long id;
@NotNull
@ManyToOne
@JoinColumn(name = "SELLER_CUSTOMERNR",
referencedColumnName = "CUSTOMERNR")
protected User seller;
}
{code}
Throws an exception when you query Items:
{code}
java.lang.ClassCastException: org.jpwh.model.complexschemas.naturalforeignkey.User cannot be cast to java.io.Serializable
at org.hibernate.type.ManyToOneType.hydrate(ManyToOneType.java:157)
at org.hibernate.persister.entity.AbstractEntityPersister.hydrate(AbstractEntityPersister.java:2807)
at org.hibernate.loader.Loader.loadFromResultSet(Loader.java:1545)
{code}
If you remove the "referencedColumnName" attribute, the binding works.
Note that this is one of those rare use cases for "property-ref" in XML binding.
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