Why JPQL ignore parent's fields? - jpa

Question

App's stack: Hibernate, Spring Data, JPA.
There are some entities in the app. I try make JPQL-query in repository of my class OpenParagraph.
OpenParagraph:
#Entity
#Table(name = "open_paragraphs")
#NoArgsConstructor
#AllArgsConstructor
#Getter
#Setter
#ToString
public class OpenParagraph extends ProgramEntry {
#NotNull
#Column(name = "sort_num")
private Integer sortNum;
}
OpenParagraph has a parent: abstract class ProgramEntry.
ProgramEntry:
#MappedSuperclass
#NoArgsConstructor
#AllArgsConstructor
#Getter
#Setter
#ToString
public abstract class ProgramEntry extends AbstractBaseEntity {
#NotNull
#ManyToOne
#JoinColumn(name = "paragraph_id")
private Paragraph paragraph;
#NotNull
#ManyToOne
#JoinColumn(name = "program_id")
private Program program;
}
So, i tring to appeal to OpenParagraph's field "Paragraph", but IDEA tells me it's mistake:
It doesn't offer me the "program" field:
IDEA offer fields only from OpenParagraph, not from parent.
My question: this is IDEA's fail? If this is'nt IDEA's fail, then how i can call "program" in this query?

Answer 1

This is/was a bug of Intellij IDEA (maybe related to this?). But:
It is possible to query by fields of the super class (or MappedSuperclass). Here is an example:
#MappedSuperclass
#Getter
#Setter
public class Foo extends AbstractPersistable<Long> {
#Column
private String fooValue;
}
#Entity
#Getter
#Setter
public class Bar extends Foo {
#Column
private String barValue;
}
public interface BarRepository extends JpaRepository<Bar, Long> {
#Query("SELECT b FROM Bar b WHERE b.fooValue = ?1")
List<Bar> findByFooValue(String fooValue);
}
Given this, calling the repository method, something like this will be logged (with enabled sql logging):
Hibernate: select bar0_.id as id1_0_, bar0_.foo_value as foo_valu2_0_, bar0_.bar_value as bar_valu3_0_ from bar bar0_ where bar0_.foo_value=?
Hint:
If you are using Spring Boot (with the test dependency/dependencies and an embedded test db like h2), it is quite easy to execute such methods without to run the whole application. Here just a small snipped that would execute the method (even though this is no test, but that's enough to call methods somehow):
#SpringBootTest
public class BarRepositoryTest {
#Autowired
BarRepository barRepository;
#Test
public void testFindByFooValue() {
barRepository.findByFooValue("foo");
}
}