When building the a query with Criteria API, downcasting to access a class specific attribute, leads to ClassCastException for the internal Hibernate classes. Please see the attachment for a minimal Spring project to reproduce this issue.
{code:java}@Entity
@Inheritance(strategy = InheritanceType.TABLE_PER_CLASS)
@Getter
@Setter
public abstract class Term extends BaseEntity {
@Column(nullable = false)
private String title;
@OneToMany(mappedBy = "term")
private Collection<Linkage> linkagesToPublications = new ArrayList<>();
}
////////
@Table
@Entity(name = "LocalTermTitle")
@Getter
@Setter
@NoArgsConstructor
public class LocalTerm extends Term {
@ManyToOne(cascade = CascadeType.MERGE)
@JoinColumn(name = "IdLanguage", nullable = false)
private Language language;
}
////////
@Table
@Entity(name = "PublicationLinkageToTerm")
@Getter
@Setter
@NoArgsConstructor
public class Linkage extends BaseEntity {
@ManyToOne
@JoinColumn(name = "IdTermTitleBase", nullable = false)
private Term term;
}
////////
public static Specification<Linkage> byTermLanguage(final Language language) {
return (root, query, cb) -> {
final var asLocalTerm = cb.treat(root.get("term"), LocalTerm.class);
return cb.equal(asLocalTerm.get("language"), language);
};
}
{code}
_Caused by: java.lang.ClassCastException: class org.hibernate.metamodel.model.domain.internal.EntitySqmPathSource cannot be cast to class org.hibernate.metamodel.model.domain.EntityDomainType (org.hibernate.metamodel.model.domain.internal.EntitySqmPathSource and org.hibernate.metamodel.model.domain.EntityDomainType are in unnamed module of loader 'app')_
_at org.hibernate.query.sqm.tree.domain.SqmTreatedSimplePath.<init>(SqmTreatedSimplePath.java:51) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final]_
_at org.hibernate.query.sqm.tree.domain.SqmEntityValuedSimplePath.treatAs(SqmEntityValuedSimplePath.java:78) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final]_
_at org.hibernate.query.sqm.tree.domain.SqmEntityValuedSimplePath.treatAs(SqmEntityValuedSimplePath.java:73) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final]_
_at org.hibernate.query.sqm.tree.domain.SqmEntityValuedSimplePath.treatAs(SqmEntityValuedSimplePath.java:21) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final]_
_at org.hibernate.query.sqm.internal.SqmCriteriaNodeBuilder.treat(SqmCriteriaNodeBuilder.java:378) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final]_
_at org.hibernate.query.sqm.internal.SqmCriteriaNodeBuilder.treat(SqmCriteriaNodeBuilder.java:153) ~[hibernate-core-6.1.6.Final.jar:6.1.6.Final]_
_at com.example.demo.repo.LinkageRepo$Specifications.lambda$byTermLanguage$67bfe078$1(LinkageRepo.java:19) ~[classes/:na]_
_at org.springframework.data.jpa.repository.support.SimpleJpaRepository.applySpecificationToCriteria(SimpleJpaRepository.java:807) ~[spring-data-jpa-3.0.0.jar:3.0.0]_
_at org.springframework.data.jpa.repository.support.SimpleJpaRepository.getQuery(SimpleJpaRepository.java:741) ~[spring-data-jpa-3.0.0.jar:3.0.0]_
_at org.springframework.data.jpa.repository.support.SimpleJpaRepository.getQuery(SimpleJpaRepository.java:726) ~[spring-data-jpa-3.0.0.jar:3.0.0]_
_at org.springframework.data.jpa.repository.support.SimpleJpaRepository.findAll(SimpleJpaRepository.java:463) ~[spring-data-jpa-3.0.0.jar:3.0.0]_
_at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[na:na]_
_at java.base/jdk.internal.reflect.NativeMethodAccessorImpl.invoke(Unknown Source) ~[na:na]_
_at java.base/jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source) ~[na:na]_
_at java.base/java.lang.reflect.Method.invoke(Unknown Source) ~[na:na]_
_at org.springframework.data.repository.core.support.RepositoryMethodInvoker$RepositoryFragmentMethodInvoker.lambda$new$0(RepositoryMethodInvoker.java:288) ~[spring-data-commons-3.0.0.jar:3.0.0]_
_at org.springframework.data.repository.core.support.RepositoryMethodInvoker.doInvoke(RepositoryMethodInvoker.java:136) ~[spring-data-commons-3.0.0.jar:3.0.0]_
_at org.springframework.data.repository.core.support.RepositoryMethodInvoker.invoke(RepositoryMethodInvoker.java:120) ~[spring-data-commons-3.0.0.jar:3.0.0]_
_at org.springframework.data.repository.core.support.RepositoryComposition$RepositoryFragments.invoke(RepositoryComposition.java:516) ~[spring-data-commons-3.0.0.jar:3.0.0]_
_…_
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