I've just upgraded Spring Boot, which upgraded Hibernate ORM from 5.4.12.Final to 5.4.18.Final
I have an association
{code:java}
@javax.persistence.ManyToOne(fetch = FetchType.LAZY)
@javax.validation.constraints.NotNull
private Product product;
{code}
I have logic that inspects metadata and collects nullable associations of an entity
{code:java}
List<Attribute<?, ?>> fields = new ArrayList<>();
fields.addAll(entityType.getSingularAttributes().stream()
.filter(singularAttribute -> singularAttribute.isAssociation()
&& singularAttribute.getType() instanceof EntityType
&& singularAttribute.isOptional())
.collect(Collectors.toList()));
return fields;
{code}
where `entityType` is `javax.persistence.metamodel.EntityType`
Previously, the `isOptional` honoured the `NotNull` constraint and returned false, not now it returns true which breaks my logic. I'm not yet sure if this is a miss-configuration by Spring Boot or by my application or if it's a bug in Hibernate, but with the upgrade this changed unexpectedly.
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