使用控制器创建 bean 时出错。面对自动装配和限定符注释的问题

Question

我正在创建一个预约医生预约的应用程序。这里我在 pojo class

中得到了 7 classes

包装内 com.capg.bookmydoctor.dto 我有 7 个 pojo classes :

com.capg.bookmydoctor.dto

Admin.java
Appointment.java
Availability.java
Doctor.java
Feedback.java
Patient.java
User.java

在 Dao 内部，我得到了 5 个 Dao 方法接口和 5 个 Dao Repository 接口

com.capg.bookmydoctor.dao


IAdminDao.java

-------------------------------------------------------------------------------------

package com.capg.bookmydoctor.dao;

import com.capg.bookmydoctor.dto.Admin;

public interface IAdminDao {


        public Admin addAdmin(Admin admin);
        public Admin updateAdmin(Admin admin);
        public Admin removeAdmin(Admin admin);
        public Admin viewAdmin(Admin admin);

    }

-------------------------------------------------------------------------------------

IAdminDaoRepository.java

-------------------------------------------------------------------------------------

package com.capg.bookmydoctor.dao;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.capg.bookmydoctor.dto.Admin;

@Repository("IAdminDao")
public interface IAdminRepository extends IAdminDao, JpaRepository<Admin, Integer>{

}

这里我只嵌入了一个Dao Interface和一个Dao Repository接口代码，使问题变小。其余界面类似。

IAppointmentDao.java
IAppointmentRepository.java

IDoctorDao.java
IDoctorRepository.java

IFeedbackDao.java
IFeedbackRepository.java

IPatientDao.java
IPatientRepository.java

在服务包中，我得到了 5 个服务方法接口和 5 个服务实现 classes

我猜是由于这些服务 classes 我收到错误，因为我的主要 class 无法找到服务 class 即使我使用了 @Autowired 和 @限定符注释。

com.capg.bookmydoctor.service 

IAdminService.java

-------------------------------------------------------------------------------------

package com.capg.bookmydoctor.service;

import com.capg.bookmydoctor.dto.Admin;

public interface IAdminService {


    public Admin addAdmin(Admin admin);
    public Admin updateAdmin(Admin admin);
    public Admin removeAdmin(Admin admin);
    public Admin viewAdmin(Admin admin);

    }

-------------------------------------------------------------------------------------

IAdminServiceImpl.java

-------------------------------------------------------------------------------------

package com.capg.bookmydoctor.service;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.stereotype.Service;

import com.capg.bookmydoctor.dao.IAdminRepository;
import com.capg.bookmydoctor.dto.Admin;

@Service("IAdminService")
public class IAdminServiceImpl implements  IAdminService {

    @Autowired
    @Qualifier("IAdminRepository")
    IAdminRepository adminDao;

    @Override
    public Admin addAdmin(Admin admin) {
        return adminDao.addAdmin(admin);
    }

    @Override
    public Admin updateAdmin(Admin admin) {
        return adminDao.updateAdmin(admin);
    }

    @Override
    public Admin removeAdmin(Admin admin) {
        return adminDao.removeAdmin(admin);
    }

   @Override
    public Admin viewAdmin(Admin admin) {
        return adminDao.viewAdmin(admin);
    }

    }

这里我只嵌入了一个服务实现 class 代码以使问题变小。其余服务实现 class 相似，只是变量和方法不同。

IAppointmentService.java
IAppointmentServiceImpl.java


IDoctorService.java
IDoctorServiceImpl.java

IFeedbackService.java
IFeedbackServiceImpl.java

IPatientService.java
IPatientServiceImpl.java

在控制器包里面我有一个class

com.capg.bookmydoctor.controller

BookMyDoctorController.java

package com.capg.bookmydoctor.controller;

import java.time.LocalDate;
import java.util.List;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Qualifier;
import org.springframework.web.bind.annotation.DeleteMapping;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.PathVariable;
import org.springframework.web.bind.annotation.PostMapping;
import org.springframework.web.bind.annotation.PutMapping;
import org.springframework.web.bind.annotation.RequestBody;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

import com.capg.bookmydoctor.dto.Admin;
import com.capg.bookmydoctor.dto.Appointment;
import com.capg.bookmydoctor.dto.AvailabilityDates;
import com.capg.bookmydoctor.dto.Doctor;
import com.capg.bookmydoctor.dto.FeedBack;
import com.capg.bookmydoctor.dto.Patient;
import com.capg.bookmydoctor.service.IAdminService;
import com.capg.bookmydoctor.service.IAppointmentService;
import com.capg.bookmydoctor.service.IDoctorService;
import com.capg.bookmydoctor.service.IFeedbackService;
import com.capg.bookmydoctor.service.IPatientService;

@RestController
@RequestMapping("/doctor")
public class BookMyDoctorController {

    @Autowired
    @Qualifier("IAdminService")
    IAdminService adminService;

    @Autowired
    @Qualifier("IAppointmentService")
    IAppointmentService appointmentService;

    @Autowired
    @Qualifier("IDoctorService")
    IDoctorService doctorService;

    @Autowired
    @Qualifier("IFeedbackService")
    IFeedbackService feedbackService;

    @Autowired
    @Qualifier("IPatientService")
    IPatientService patientService;

    @PostMapping("/admin")
    public Admin addAdmin(@RequestBody Admin admin) {
        return adminService.addAdmin(admin);
    }

    @PutMapping("/admin")
    public Admin updateAdmin(@RequestBody Admin admin) {
        return adminService.updateAdmin(admin);
   }

    @DeleteMapping("/admin")
    public Admin removeAdmin(@RequestBody Admin admin) {
        return adminService.removeAdmin(admin);
    }

    @GetMapping("/admin")
    public Admin viewAdmin(@RequestBody Admin admin) {
        return adminService.viewAdmin(admin);
     }

    @GetMapping("/appointment")
    public List<Appointment> getAllAppointments() {
        return appointmentService.getAllAppointments();
    }

    @GetMapping("/feedback/all")
    public List<FeedBack> getAllFeedback(@RequestBody Doctor doc) {
        return feedbackService.getAllFeedback(doc);
    }

    @PostMapping("/patient")
    public Patient addPatient(@RequestBody Patient bean) {
        return patientService.addPatient(bean);
    }

    @PutMapping("/patient")
    public Patient editPatientProfile(@RequestBody Patient bean) {
        return patientService.editPatientProfile(bean);
    }

    @DeleteMapping("/patient")
    public Patient removePatientDetails(@RequestBody Patient bean) {
        return patientService.removePatientDetails(bean);
    }

    @GetMapping("/patient")
    public Patient getPatient(@RequestBody Patient patient) {
        return patientService.getPatient(patient);
    }

    @GetMapping("/patient/all")
    public List<Patient> getAllPatient() {
        return patientService.getAllPatient();
    }

    @GetMapping("/patient/doctor")
    public List<Patient> getPatientListByDoctor(@RequestBody Doctor doctor) {
        return patientService.getPatientListByDoctor(doctor);
    }

    @GetMapping("/patient/{appdate}")
    public List<Patient> getPatientListByDate(@PathVariable LocalDate appdate) {
        return patientService.getPatientListByDate(appdate);
    }

包裹里面com.capg.bookmydoctor我拿到了spring展位申请class

com.capg.bookmydoctor 

package com.capg.bookmydoctor;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.annotation.ComponentScan;

@SpringBootApplication
@ComponentScan("com.capg.bookmydoctor.controller,com.capg.bookmydoctor.dao,com.capg.bookmydoctor.service,com.capg.bookmydoctor.dto")
public class BookMyDoctorAppApplication {

        public static void main(String[] args) {
            SpringApplication.run(BookMyDoctorAppApplication.class, args);
        }

    }

这里我对所有包都使用了相同的包名“com.capg.bookmydoctor”。

这里我对所有服务实现class都使用了@Service注解，并在其中指定了服务接口名称。

我使用了@Qualifier 注释和@Autowired，因为我得到了不同的存储库和服务实现classes。

尽管做了所有这些，但我在控制台中收到了这些错误

错误：

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'bookMyDoctorController': Unsatisfied dependency expressed through field 'adminService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'IAdminService': Unsatisfied dependency expressed through field 'adminDao'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.capg.bookmydoctor.dao.IAdminRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value=IAdminRepository)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=17=](AbstractBeanFactory.java:335) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:944) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:918) ~[spring-context-5.3.5.jar:5.3.5]
at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:583) ~[spring-context-5.3.5.jar:5.3.5]
at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:144) ~[spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:769) [spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:761) [spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:426) [spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:326) [spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1313) [spring-boot-2.4.4.jar:2.4.4]
at org.springframework.boot.SpringApplication.run(SpringApplication.java:1302) [spring-boot-2.4.4.jar:2.4.4]
at com.capg.bookmydoctor.BookMyDoctorAppApplication.main(BookMyDoctorAppApplication.java:12) [classes/:na]

Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'IAdminService': Unsatisfied dependency expressed through field 'adminDao'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.capg.bookmydoctor.dao.IAdminRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value=IAdminRepository)}
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:660) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:640) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:119) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:399) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1413) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:601) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:524) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean[=17=](AbstractBeanFactory.java:335) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:333) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:208) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:276) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1380) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.5.jar:5.3.5]
... 21 common frames omitted

Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.capg.bookmydoctor.dao.IAdminRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true), @org.springframework.beans.factory.annotation.Qualifier(value=IAdminRepository)}
at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1790) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1346) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1300) ~[spring-beans-5.3.5.jar:5.3.5]
at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:657) ~[spring-beans-5.3.5.jar:5.3.5]
... 35 common frames omitted

请帮助我摆脱这些错误

谢谢...

Answer 1

在IAdminRepository中，bean的名称是"IAdminDao"。

package com.capg.bookmydoctor.dao;

import org.springframework.data.jpa.repository.JpaRepository;
import org.springframework.stereotype.Repository;

import com.capg.bookmydoctor.dto.Admin;

@Repository("IAdminDao")
public interface IAdminRepository extends IAdminDao, JpaRepository<Admin, Integer>{

}

在服务 class IAdminServiceImpl 中，您的自动装配错误 Qualifier:

    @Autowired
    @Qualifier("IAdminRepository")
    IAdminRepository adminDao;

应该是：

    @Autowired
    @Qualifier("IAdminDao")
    IAdminRepository adminDao;

你应该在其他 DAO/Service classes.

中检查这个

Answer 2

你一直都用错了注解。如果您将名称传递给 @Repository("IAdminDao") 之类的注释，那么您正在创建名称为“IAdminDao”的 bean，它应该使用 @Autowire @Qualifier(IAdminDao) 自动装配，但您正在做的是 @Qualifier("IAdminRepository")因为没有这个名称的 bean，所以你会收到错误。

如果接口只有一个实现，则删除所有限定符，并从 interface/classes 上使用的注释中删除名称，例如。只写@Repository，@Service。然后使用@Autowired。如果 bean 依赖性是唯一的问题，这应该会启动您的应用程序。或者使用 spring 文档中描述的 bean 命名。

使用控制器创建 bean 时出错。面对自动装配和限定符注释的问题

Error creating bean with controller. Facing issues with autowired and qualifier annotations

java

spring

qualifiers

spring-boot