When a user does not explicitly register a function on the Dialect selected a NullPointerException is thrown without much reason as to why. I would like to suggest handling this problem more gracefully to notify the user of the mistake.
Consider the following:
{code:title=Animal.java|borderStyle=solid}
@Entity
@Table( name = "ANIMAL" )
public class Animal {
private Long id;
private Animal mother;
private Animal father;
private String name;
private Date born;
}
{code}
{code:title=query|borderStyle=solid}
CriteriaBuilder cb = em.getCriteriaBuilder();
CriteriaQuery<HumanPojo> criteria = cb.createQuery( HumanPojo.class );
Root<Human> root = criteria.from( Human.class );
criteria.select(
cb.construct(
HumanPojo.class,
root.get(Human_.id),
root.get(Human_.name),
cb.function(
"convert",
String.class,
root.get(Human_.born),
cb.literal(110))
)
);
em.createQuery( criteria ).getResultList();
{code} |
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