PSQLException: ERROR: null value in column "person" violates not-null constraint when trying class-based projection - spring-boot

Question

I cannot solve my problem, although following a documentation regarding class-based projection.
I always get the following error message:
PSQLException: ERROR: null value in column "person" violates not-null constraint
This is my entity class
#Entity
#Table(name="incomeoutgo", schema = "public")
public class IncomeOutgo extends AbstractPersistable<Long> {
#NotNull
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name ="id")
private Long id;
#NotNull
#Column(name="dayofweek")
private Date dayofweek;
#NotNull
#Size(min= 2, max= 100)
#Column(name="position")
private String position;
#NotNull
#Size(min = 5, max = 50)
#Column(name ="person")
private String person;
#NotNull
#Size(min= 1)
#Column(name="income")
private double income;
#NotNull
#Size(min= 2)
#Column(name="outgo")
private double outgo;
}
So does my Repository look like:
#Repository
public interface ChooseMonthRepository extends JpaRepository<IncomeOutgo, Date> {
#Query(value = "SELECT dayofweek, person, position, income, outgo FROM IncomeOutgo WHERE dayofweek >= :start_dayofmonth AND dayofweek <= :end_dayofmonth", nativeQuery = true)
List<DateChoiceDTO> findAllByDate(#Param("start_dayofmonth") Date start_dayofmonth, #Param("end_dayofmonth") Date end_dayofmonth);
}
This is my class-based projection
#AllArgsConstructor
#NoArgsConstructor
#Data
public class DateChoiceDTO {
Date dayofweek;
String person;
String position;
double income;
double outgo;
}
The Service class
#RequiredArgsConstructor
#Service
#Transactional(readOnly=true)
public class DateChoiceService {
private final ChooseMonthRepository incomeOutgoDateChoice;
public List<?> getAllForDateChoice(Date start_dayofmonth) {
Date lastDayOfMonth=java.util.Calendar.getInstance().getTime();
return incomeOutgoDateChoice.findAllByDate(start_dayofmonth, lastDayOfMonth);
}
}
And last but not least my Controller
#RequiredArgsConstructor
#Controller
#Validated
#RequestMapping(value = "/")
public class DateChoiceController {
private static final String DATE_CHOICE_VIEW = "DateChoice";
private final DateChoiceService dateChoiceService;
#GetMapping("/")
public String homeInit(Model model) {
return DATE_CHOICE_VIEW;
}
#PostMapping(value = "/")
public String addUser(#ModelAttribute("incomeoutgo") #Valid DateChoiceDTO dateChoice, Model model, #NotNull BindingResult bindingResult) {
if(bindingResult.hasErrors()) {
return DATE_CHOICE_VIEW;
}
List<?> incomeOutgoList = dateChoiceService.getAllForDateChoice(dateChoice.getDayofweek());
model.addAttribute(DATE_CHOICE_VIEW, incomeOutgoList);
return DATE_CHOICE_VIEW;
}
}
I do not understand why the person column suddenly comes into play?
Maybe someone can tell me what I am doing wrong here?

Answer 1

You are getting following exception because the framework is not sure what to do with the tuple.
No converter found capable of converting from type AbstractJpaQuery$TupleConverter$TupleBackedMap to type DateChoiceDTO
You have to use fully qualified name of the class when you are using construction result set mapping in the query like below:
select new a.b.cSomeDto(t.property1, t.property2) from table t
Here is how i have fixed it:
#Query(value = "SELECT new com.example.samplejdbctemplatecall.DateChoiceDTO" +
"(table.dayofweek, table.person, table.position, table.income, table.outgo) " +
"FROM IncomeOutgo table WHERE table.dayofweek >= :start_dayofmonth AND table.dayofweek <= :end_dayofmonth")
List<DateChoiceDTO> findAllByDateSecond(#Param("start_dayofmonth") Date start_dayofmonth, #Param("end_dayofmonth") Date end_dayofmonth);
But as mentioned by Simon, if you have insert query firing from somewhere else you need to fix that first, because this is a complete retrieval operation and the error you are facing is related to data insertion.
Entire working sample(+ interface projection):
#RequestMapping("/test")
#RestController
class IncomeOutgoController {
private final ChooseMonthRepository chooseMonthRepository;
private int days = 0;
#Autowired
IncomeOutgoController(ChooseMonthRepository chooseMonthRepository) {
this.chooseMonthRepository = chooseMonthRepository;
}
#GetMapping("/interface-projection")
public Object interfaceProjection() {
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, -1);
Date date = calendar.getTime();
calendar = Calendar.getInstance();
return composeResponse("interface-projection", chooseMonthRepository.findAllByDate(date, calendar.getTime()));
}
#GetMapping("/constructor-projection")
public Object constructorProjection() {
Calendar calendar = Calendar.getInstance();
calendar.add(Calendar.MONTH, -1);
Date date = calendar.getTime();
calendar = Calendar.getInstance();
return composeResponse("constructor-projection", chooseMonthRepository.findAllByDateSecond(date, calendar.getTime()));
}
#GetMapping("/store")
public Object addRandomData() {
String randomUuid = UUID.randomUUID().toString();
chooseMonthRepository.save(new IncomeOutgo(null, Calendar.getInstance().getTime(), "random-position: " + randomUuid,
randomUuid, new Random(5000).nextDouble(), new Random(500).nextDouble()));
return "success";
}
private Map<String, Object> composeResponse(String key, Object value) {
final Map<String, Object> response = new HashMap<>();
response.put(key, value);
return response;
}
}
#AllArgsConstructor
#NoArgsConstructor
#Entity
#Table(name = "incomeoutgo", schema = "public")
class IncomeOutgo extends AbstractPersistable<Long> {
#NotNull
#GeneratedValue(strategy = GenerationType.IDENTITY)
#Column(name = "id")
private Long id;
#NotNull
#Column(name = "dayofweek")
private Date dayofweek;
#NotNull
#Size(min = 2, max = 100)
#Column(name = "position")
private String position;
#NotNull
#Size(min = 5, max = 50)
#Column(name = "person")
private String person;
#NotNull
#Size(min = 1)
#Column(name = "income")
private double income;
#NotNull
#Size(min = 2)
#Column(name = "outgo")
private double outgo;
}
#Repository
interface ChooseMonthRepository extends JpaRepository<IncomeOutgo, Date> {
#Query(value = "SELECT dayofweek, person, position, income, outgo FROM IncomeOutgo WHERE dayofweek >= :start_dayofmonth AND dayofweek <= :end_dayofmonth", nativeQuery = true)
List<DateChoiceDTOInterface> findAllByDate(#Param("start_dayofmonth") Date start_dayofmonth, #Param("end_dayofmonth") Date end_dayofmonth);
#Query(value = "SELECT new com.example.samplejdbctemplatecall.DateChoiceDTO" +
"(table.dayofweek, table.person, table.position, table.income, table.outgo) " +
"FROM IncomeOutgo table WHERE table.dayofweek >= :start_dayofmonth AND table.dayofweek <= :end_dayofmonth")
List<DateChoiceDTO> findAllByDateSecond(#Param("start_dayofmonth") Date start_dayofmonth, #Param("end_dayofmonth") Date end_dayofmonth);
}
#AllArgsConstructor
#NoArgsConstructor
#Getter
#Setter
class DateChoiceDTO {
Date dayofweek;
String person;
String position;
Double income;
Double outgo;
}
interface DateChoiceDTOInterface {
Date getDayOfWeek();
String getPerson();
String getPosition();
Double getIncome();
Double getOutgo();
}
application.properties
spring.jpa.hibernate.ddl-auto=update
spring.datasource.url=jdbc:postgresql://172.17.0.2:5432/postgres
spring.datasource.username=postgres
spring.datasource.password=mysecretpassword
spring.jpa.database-platform=org.hibernate.dialect.PostgreSQLDialect
spring.jpa.show-sql=true