首先,你好。我有员工、地点、部门和工作类别。每个类都有自己的 JPA Repository 接口。我有一个服务类,我想在这个类中一一创建对象,用控制器调用这个方法并写入数据库。但我收到以下错误。我该如何修复这个错误?我哪里做错了,如果您能帮忙,我将不胜感激。项目结构在这里服务@Servicepublic class MainService { @Autowired LocationsRepository locationsRepository; @Autowired JobsRepository jobsRepository; @Autowired EmployeesRepository employeesRepository; @Autowired DepartmentsRepository departmentsRepository; public String generateManual() { try { Locations locations = new Locations(); locations.setCountry("Turkey"); locations.setCity("Istanbul"); locationsRepository.save(locations); Jobs jobs = new Jobs(); jobs.setSalary(4000); jobs.setTitle("Software Developer"); jobsRepository.save(jobs); Employees employees = new Employees(); employees.setFirstName("Mutlu"); employees.setLastName("Eren"); employees.setJobs(jobs); employeesRepository.save(employees); Departments departments = new Departments(); departments.setName("IT"); departments.setLocations(locations); List<Employees> empList = new ArrayList<>(); empList.add(employees); departments.setEmployees(empList); departmentsRepository.save(departments); return "SUCCESS."; }catch(Exception e) { e.printStackTrace(); return "FAILED."; } }}控制器@RestControllerpublic class MainController { @Autowired MainService mainService; @GetMapping("/generate") public void generate() { mainService.generateManual(); }}资源spring.datasource.url=jdbc:mysql://localhost:3306/companydb?useUnicode=true&characterEncoding=UTF-8&useLegacyDatetimeCode=false&serverTimezone=Turkeyspring.datasource.username=rootspring.datasource.password=
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