Ошибка при PUT-методе

Пытаюсь сделать метод по обновлению сервиса. Но в ответ приходит 404 и вот такая ошибка Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction". Что это может быть?

метод Update ServiceService:

  public Service update(Service service) {
    Service serviceToUpdate = serviceRepository.findById(service.getId()).orElseThrow(() ->
        new RuntimeException("Requested entity was not found"));
    serviceToUpdate.setId(service.getId());
    serviceToUpdate.setName(service.getName());
    serviceToUpdate.setAddress(service.getAddress());
    serviceToUpdate.setLandmark(service.getLandmark());
    serviceToUpdate.setWeb(service.getWeb());
    serviceToUpdate.setPhone(service.getPhone());
    serviceToUpdate.setMinAge(service.getMinAge());
    serviceToUpdate.setMaxAge(service.getMaxAge());
    serviceToUpdate.setPhotoRaw(service.getPhotoRaw());
    serviceToUpdate.setCity(service.getCity());
    serviceToUpdate.setDistrict(service.getDistrict());
    serviceToUpdate.setMetroStation(service.getMetroStation());
    serviceToUpdate.setSeller(service.getSeller());
    return serviceRepository.save(serviceToUpdate);
  }

Контроллер:

@RequestMapping(value = "/service/{id}", method = RequestMethod.PUT)
  public ResponseEntity<String> updateService(@PathVariable("id") Long id, @RequestBody Service
      service) {
    if (serviceService.findById(id) == null) {
      return ResponseEntity.status(HttpStatus.NOT_FOUND).build();
    } else {
      service.setId(id);
      serviceService.update(service);
      return ResponseEntity.status(HttpStatus.OK).build();
    }
  }

В ответ получаю такую ошибку:

{
    "status": "NOT_FOUND",
    "message": "Could not commit JPA transaction; nested exception is javax.persistence.RollbackException: Error while committing the transaction",
    "errors": [
        "Requested entity was not found"
    ]
}