How to deal with null received from MongoDB using SpringBoot? - json

Question

I am using Java 17, Spring Boot 2.7 with MongoDB with MongoTemplate. But the data I am receiving are filled with null. Is the problem arises due to conversion from bson to json ? Or something else which I overlooked.
My UI Class:
#Getter
public class LvUi {
private final String employeeCode;
public LvUi(
#Size(max = 5, message = "Employee Code Must Be Within 4 To 5 Character Long Or Blank")
#JsonProperty("employeeCode") String employeeCode) {
this.employeeCode = employeeCode;
}
}
My Record Class:
public record Leave(
String employeeCode,String leaveType,
LocalDate startDate, LocalDate endDate
) {
}
My Repository:
public interface AttendanceRepo {
List<Leave> selectLeaveApplication(LvUi lvUi);
}
#Repository("attendanceMongo")
public class AttendanceRepoMongo implements AttendanceRepo {
private final MongoTemplate mongoTemplate;
#Autowired
public AttendanceRepoMongo(MongoTemplate mongoTemplate) {
this.mongoTemplate = mongoTemplate;
}
#Override
public List<Leave> selectLeaveApplication(LvUi lvUi) {
final Query query = new Query();
query.addCriteria(Criteria.where("emp_cd")
.is(lvUi.getEmployeeCode()));
query.fields()
.include("emp_cd","leave_type","leave_start","leave_end");
return new ArrayList<>(mongoTemplate.find(query, Leave.class, "leave"));
}
}
My Controller:
#RestController
#RequestMapping("hr/")
public class AttendanceApi {
private final AttendanceService attendanceService;
#Autowired
public AttendanceApi(AttendanceService attendanceService) {
this.attendanceService = attendanceService;
}
#PostMapping("leave/application/pre")
public List<Leave> leaveApplicationPre(
#Valid #NotNull #RequestBody LvUi lvUi) {
return attendanceService.selectLeaveApplication(lvUi);
}
}
My Service:
public interface AttendanceService {
List<Leave> selectLeaveApplication(LvUi lvUi);
}
#Service("attendanceService")
public class AttendanceServiceImpl implements AttendanceService {
private final AttendanceRepo attendanceRepo;
#Autowired
public AttendanceServiceImpl(
#Qualifier("attendanceMongo") AttendanceRepo attendanceRepo) {
this.attendanceRepo = attendanceRepo;
}
#Override
public List<Leave> selectLeaveApplication(LvUi lvUi) {
return attendanceRepo.selectLeaveApplication(lvUi);
}
}
My Config:
#Configuration
#AutoConfigureOrder(Ordered.HIGHEST_PRECEDENCE)
public class ErpConfig {
#Bean
public MongoTemplate mongoTemplate() {
final MongoClient mongoClient = MongoClients.create("mongodb://localhost:27017");
return new MongoTemplate(mongoClient, "erpdb");
}
}
My Data:
[
{
"_id": ObjectId("62ac28826940f44772b94b64"),
"emp_cd": "A001",
"appl_no": 59,
"leave_type": "CL",
"leave_start": ISODate("2022-05-09T00:00:00Z"),
"leave_end": ISODate("2022-05-09T00:00:00Z")
},
{
"_id": ObjectId("62ac28826940f55772b94b64"),
"emp_cd": "A002",
"appl_no": 69,
"leave_type": "EL",
"leave_start": ISODate("2022-05-09T00:00:00Z"),
"leave_end": ISODate("2022-05-09T00:00:00Z")
},
{
"_id": ObjectId("62ac28826940f66772b94b64"),
"emp_cd": "A002",
"appl_no": 79,
"leave_type": "EL",
"leave_start": ISODate("2022-06-09T00:00:00Z"),
"leave_end": ISODate("2022-06-09T00:00:00Z")
}
]
My Input (Through Postman):
POST
http://localhost:8080/hr/leave/application/pre
{
"employeeCode": "A002"
}
My Output (Through Postman):
[
{
"emp_cd": null,
"leave_type": null,
"leave_start": null,
"leave_end": null
},
{
"emp_cd": null,
"leave_type": null,
"leave_start": null,
"leave_end": null
}
]
If I add the following code in my Repository
final FindIterable<Document> documents =
mongoTemplate.getCollection("leave").find();
List<Document> res = new ArrayList<>();
for (Document document : documents)
res.add(document);
res.forEach(System.out::println);
The Result :
Document{{_id=62ac28826940f44772b94b64, emp_cd=A001, appl_no=59, leave_type=CL, leave_start=Mon May 09 05:30:00 IST 2022, leave_end=Mon May 09 05:30:00 IST 2022}}
Document{{_id=62ac28826940f55772b94b64, emp_cd=A002, appl_no=69, leave_type=EL, leave_start=Mon May 09 05:30:00 IST 2022, leave_end=Mon May 09 05:30:00 IST 2022}}
Document{{_id=62ac28826940f66772b94b64, emp_cd=A002, appl_no=79, leave_type=EL, leave_start=Sat Jun 09 05:30:00 IST 2022, leave_end=Sat Jun 09 05:30:00 IST 2022}}
Please help.