To a lot of problems with @MappedSuperclass with generics.
We have:
{code:java}
@MappedSuperclass
public class AbstractEntity<ID extends Serializable> {
@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
protected ID id;
...
}
{code}
And we have:
{code:java}
@Entity
@Table(name = "SomeEntity")
public class SomeEntity extends AbstractEntity<Integer> {
}
{code}
Next, jpa criteria:
{code:java}
public Predicate toPredicate(Root root, CriteriaQuery criteriaQuery, CriteriaBuilder criteriaBuilder) {
//Here we have - Serializable, but expected Integer.
root.get("id").getJavaType();
return ...;
}
{code}
If the generic parameter is just type, we have Object at getJavaType().
TEST CASE:
I'm try to execute criteria query and have this test case:
{code:java}
CriteriaBuilder builder = entityManager.getCriteriaBuilder();
CriteriaQuery<SomeEntity> criteria = builder.createQuery(SomeEntity.class);
Root<SomeEntity> root = criteria.from(SomeEntity.class);
Specification<SomeEntity> specification = (roott, criteriaQuery, criteriaBuilder) -> {
Path<Integer> idField = root.get("id");
assertEquals(idField.getJavaType(), Integer.class);
return criteriaBuilder.equal(idField, 1);
};
criteria.where(specification.toPredicate(root, criteria, builder));
criteria.select(root);
assertEquals(entityManager.createQuery(criteria).getResultList().size(), 1);
{code}
And i have assertion exception - getJavaType() returns Serializable.
In my project requirements i need to know type of fields in MappedSuperclass. |
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