JPA - Attributeconverter not working with native query - sql

Question

I have created AttributeConverter class which is converting Enum to DB value and overriden the necessary methods.
If I use JPA query like below then converter is getting called and getting correct result.
public List<Driver> findByStatus(DriverStatus status);
BUT If I use with Query annotation that AttributeConverter is not getting called. I have more complex query where I need to use native query with Attribute Converter but it is not working for me.
#Query(value = "select * from driver where status=:status", nativeQuery = true)
public List<Driver> findByStatus1(DriverStatus status);
is there any way to handle this requirement ?
Update 1 - below is the Converter code
#Converter(autoApply = true)
public class DriverStatusConverter implements AttributeConverter<DriverStatus, String> {
#Override
public String convertToDatabaseColumn(DriverStatus driverStatus) {
if (driverStatus == null) {
return null;
}
System.err.println("from converter" +driverStatus.getCode());
return driverStatus.getCode();
}
#Override
public DriverStatus convertToEntityAttribute(String code) {
if (code == null) {
return null;
}
return Stream.of(DriverStatus.values()).filter(c -> c.getCode().equals(code)).findFirst()
.orElseThrow(IllegalArgumentException::new);
}
}

Answer 1

Faced similar issue, wasn't able to find satisfying solution, so had to resort to the ugly hack... Repository method signature was changed like so:
public List<Driver> findByStatus1(Integer status);
...and was called like so:
repository.findByStatus1(DriverStatus.YOUR_DESIRED_STATUS.getCode());
Yes, it's ugly and kinda defeats the purpose of AttributeConverter, but at least it works. In my particular case I had to resort to such measures just with one native query. AttributeConverter still works for the all other JPA queries.

Answer 2

I just come across same problem and use following to go around it
DriverStatusConverter move logic code in convertToEntityAttribute to public static method:
#Override
public DriverStatus convertToEntityAttribute(String code) {
return convertStringToEnum(code);
}
public static DriverStatus convertStringToEnum(String code) {
if (code == null) {
return null;
}
return Stream.of(DriverStatus.values()).filter(c -> c.getCode().equals(code)).findFirst()
.orElseThrow(IllegalArgumentException::new);
}
create new DriverDTO for native query result
public interface DriverDTO {
public Integer getId();
public String getName();
public String getStatusCode();
default DriverStatus getStatus() {
return DriverStatusConverter.convertStringToEnum(getStatusCode());
}
}
DriverRepository findByStatusCode() select columns in query and return DriverDTO class
#Query(value = "select id, name, status as statusCode from driver WHERE status=:statusCode", nativeQuery = true)
public List<DriverDTO> findByStatusCode(String statusCode);

Answer 3

Remove the nativeQuery = true and try.
#Query(value = "select * from driver where status=:status")
public List<Driver> findByStatus1(DriverStatus status);
Alternatively you can try using entityManager like so -
This is just sample code.
TypedQuery<Trip> q = entityManager.createQuery("SELECT t FROM Trip t WHERE t.vehicle = :v", Trip.class);
q.setParameter("v", Vehicle.PLANE);
List<Trip> trips = q.getResultList();
Reference -
https://thorben-janssen.com/jpa-21-type-converter-better-way-to/