Java Spring Bug：考虑定义一个名为“Y*X27”的bean；实体管理工厂&x27；在您的配置中

我在尝试启动Spring Boot应用程序时收到以下错误：

注意：仅当我将

@Autowired

注释置于

idevicepository idevicepository上方时，才会发生此错误DeviceDao.java

类中的code>

我还没有将

DeviceDao.java

持久化到数据库中，但是正在创建实体

> *************************** 
> APPLICATION FAILED TO START
> ***************************
> 
> Description: 
> Field iDeviceRepository in com.abc.dao.DeviceDao required a bean named 'entityManagerFactory' that could not be found. 
> Action:
> Consider defining a bean named 'entityManagerFactory' in your configuration.

这是项目的目录结构：

├───src
│   ├───main
│   │   ├───java
│   │   │   └───com
│   │   │       └───abc
│   │   │           ├───controller
│   │   │           ├───dao
│   │   │           │   └───repositories
│   │   │           ├───init
│   │   │           ├───model
│   │   │           ├───service
│   │   │           └───util
│   │   │               ├───common
│   │   │               ├───enums
│   │   │               ├───exceptions
│   │   │               └───interfaces
│   │   └───resources
│   │       ├───static
│   │       │   ├───css
│   │       │   ├───fonts
│   │       │   ├───img
│   │       │   └───js
│   │       └───templates

com.abc.init.Application.java

package com.abc.init;

@SpringBootApplication
@EnableJpaRepositories("com.abc.dao.repositories")
@EntityScan(basePackages = { "com.abc.model" })
@ComponentScan(basePackages={ "com.abc.controller", "com.abc.service", "com.abc.dao" })
public class Application
{
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

package com.abc.controller;

@Controller
public class RegisterController
{
    @Autowired
    RegisterServiceImpl registerService;

    @GetMapping("/register")
    public String registerForm(Model model) {
        model.addAttribute("device", new Device());
        return "registerDevice";
    }

    @PostMapping("/register")
    public String registerSubmit(@ModelAttribute Device device) {
        registerService.registerDevice(device)
        return "registerDeviceSuccess";
    }
}

package com.abc.service;

@Service
public class RegisterServiceImpl implements IRegisterService
{
    @Autowired
    DeviceDao devDao;

    public boolean registerDevice (Device device) {
        devDao.saveDevice(device);
        return true;
    }
}

package com.abc.dao;

@Repository
public class DeviceDao 
{
    @Autowired
    IDeviceRepository iDeviceRepository;

    public Device saveDevice(Device device) {
        return iDeviceRepository.save(device);
    }
}

package com.abc.dao.repositories;

@Repository
public interface IDeviceRepository extends CrudRepository<Device, Long> {}

com.abc.controller.RegisterController.java

package com.abc.init;

@SpringBootApplication
@EnableJpaRepositories("com.abc.dao.repositories")
@EntityScan(basePackages = { "com.abc.model" })
@ComponentScan(basePackages={ "com.abc.controller", "com.abc.service", "com.abc.dao" })
public class Application
{
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

package com.abc.controller;

@Controller
public class RegisterController
{
    @Autowired
    RegisterServiceImpl registerService;

    @GetMapping("/register")
    public String registerForm(Model model) {
        model.addAttribute("device", new Device());
        return "registerDevice";
    }

    @PostMapping("/register")
    public String registerSubmit(@ModelAttribute Device device) {
        registerService.registerDevice(device)
        return "registerDeviceSuccess";
    }
}

package com.abc.service;

@Service
public class RegisterServiceImpl implements IRegisterService
{
    @Autowired
    DeviceDao devDao;

    public boolean registerDevice (Device device) {
        devDao.saveDevice(device);
        return true;
    }
}

package com.abc.dao;

@Repository
public class DeviceDao 
{
    @Autowired
    IDeviceRepository iDeviceRepository;

    public Device saveDevice(Device device) {
        return iDeviceRepository.save(device);
    }
}

package com.abc.dao.repositories;

@Repository
public interface IDeviceRepository extends CrudRepository<Device, Long> {}

com.abc.service.RegisterServiceImpl.java

package com.abc.init;

@SpringBootApplication
@EnableJpaRepositories("com.abc.dao.repositories")
@EntityScan(basePackages = { "com.abc.model" })
@ComponentScan(basePackages={ "com.abc.controller", "com.abc.service", "com.abc.dao" })
public class Application
{
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

package com.abc.controller;

@Controller
public class RegisterController
{
    @Autowired
    RegisterServiceImpl registerService;

    @GetMapping("/register")
    public String registerForm(Model model) {
        model.addAttribute("device", new Device());
        return "registerDevice";
    }

    @PostMapping("/register")
    public String registerSubmit(@ModelAttribute Device device) {
        registerService.registerDevice(device)
        return "registerDeviceSuccess";
    }
}

package com.abc.service;

@Service
public class RegisterServiceImpl implements IRegisterService
{
    @Autowired
    DeviceDao devDao;

    public boolean registerDevice (Device device) {
        devDao.saveDevice(device);
        return true;
    }
}

package com.abc.dao;

@Repository
public class DeviceDao 
{
    @Autowired
    IDeviceRepository iDeviceRepository;

    public Device saveDevice(Device device) {
        return iDeviceRepository.save(device);
    }
}

package com.abc.dao.repositories;

@Repository
public interface IDeviceRepository extends CrudRepository<Device, Long> {}

com.abc.util.interfaces.IRegisterService

package com.abc.util.interfaces;

public interface IRegisterService
{
    public boolean registerDevice(Device device);
}

com.abc.dao.DeviceDao.java

package com.abc.init;

@SpringBootApplication
@EnableJpaRepositories("com.abc.dao.repositories")
@EntityScan(basePackages = { "com.abc.model" })
@ComponentScan(basePackages={ "com.abc.controller", "com.abc.service", "com.abc.dao" })
public class Application
{
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

package com.abc.controller;

@Controller
public class RegisterController
{
    @Autowired
    RegisterServiceImpl registerService;

    @GetMapping("/register")
    public String registerForm(Model model) {
        model.addAttribute("device", new Device());
        return "registerDevice";
    }

    @PostMapping("/register")
    public String registerSubmit(@ModelAttribute Device device) {
        registerService.registerDevice(device)
        return "registerDeviceSuccess";
    }
}

package com.abc.service;

@Service
public class RegisterServiceImpl implements IRegisterService
{
    @Autowired
    DeviceDao devDao;

    public boolean registerDevice (Device device) {
        devDao.saveDevice(device);
        return true;
    }
}

package com.abc.dao;

@Repository
public class DeviceDao 
{
    @Autowired
    IDeviceRepository iDeviceRepository;

    public Device saveDevice(Device device) {
        return iDeviceRepository.save(device);
    }
}

package com.abc.dao.repositories;

@Repository
public interface IDeviceRepository extends CrudRepository<Device, Long> {}

com.abc.dao.repositories.IDeviceRepository.java

package com.abc.init;

@SpringBootApplication
@EnableJpaRepositories("com.abc.dao.repositories")
@EntityScan(basePackages = { "com.abc.model" })
@ComponentScan(basePackages={ "com.abc.controller", "com.abc.service", "com.abc.dao" })
public class Application
{
    public static void main(String[] args) {
        SpringApplication.run(Application.class, args);
    }
}

package com.abc.controller;

@Controller
public class RegisterController
{
    @Autowired
    RegisterServiceImpl registerService;

    @GetMapping("/register")
    public String registerForm(Model model) {
        model.addAttribute("device", new Device());
        return "registerDevice";
    }

    @PostMapping("/register")
    public String registerSubmit(@ModelAttribute Device device) {
        registerService.registerDevice(device)
        return "registerDeviceSuccess";
    }
}

package com.abc.service;

@Service
public class RegisterServiceImpl implements IRegisterService
{
    @Autowired
    DeviceDao devDao;

    public boolean registerDevice (Device device) {
        devDao.saveDevice(device);
        return true;
    }
}

package com.abc.dao;

@Repository
public class DeviceDao 
{
    @Autowired
    IDeviceRepository iDeviceRepository;

    public Device saveDevice(Device device) {
        return iDeviceRepository.save(device);
    }
}

package com.abc.dao.repositories;

@Repository
public interface IDeviceRepository extends CrudRepository<Device, Long> {}

堆栈跟踪：

java.lang.IllegalStateException: Failed to load ApplicationContext
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'registerController': Unsatisfied dependency expressed through field 'registerService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'registerServiceImpl': Unsatisfied dependency expressed through field 'devDao'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'deviceDao': Unsatisfied dependency expressed through field 'iDeviceRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'IDeviceRepository': Cannot create inner bean '(inner bean)#36dce7ed' of type [org.springframework.orm.jpa.SharedEntityManagerCreator] while setting bean property 'entityManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#36dce7ed': Cannot resolve reference to bean 'entityManagerFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'entityManagerFactory' available
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'registerServiceImpl': Unsatisfied dependency expressed through field 'devDao'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'deviceDao': Unsatisfied dependency expressed through field 'iDeviceRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'IDeviceRepository': Cannot create inner bean '(inner bean)#36dce7ed' of type [org.springframework.orm.jpa.SharedEntityManagerCreator] while setting bean property 'entityManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#36dce7ed': Cannot resolve reference to bean 'entityManagerFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'entityManagerFactory' available
Caused by: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'deviceDao': Unsatisfied dependency expressed through field 'iDeviceRepository'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'IDeviceRepository': Cannot create inner bean '(inner bean)#36dce7ed' of type [org.springframework.orm.jpa.SharedEntityManagerCreator] while setting bean property 'entityManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#36dce7ed': Cannot resolve reference to bean 'entityManagerFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'entityManagerFactory' available
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'IDeviceRepository': Cannot create inner bean '(inner bean)#36dce7ed' of type [org.springframework.orm.jpa.SharedEntityManagerCreator] while setting bean property 'entityManager'; nested exception is org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#36dce7ed': Cannot resolve reference to bean 'entityManagerFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'entityManagerFactory' available
Caused by: org.springframework.beans.factory.BeanCreationException: Error creating bean with name '(inner bean)#36dce7ed': Cannot resolve reference to bean 'entityManagerFactory' while setting constructor argument; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'entityManagerFactory' available
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'entityManagerFactory' available

---

任何人都可以提供建议吗？

在spring boot中，您不需要使用repository注释来注释您的repository类

@Repository

您只需要在接口上扩展JPARepository，剩下的就由Spring boot来处理了。 例如：

public interface YourRepository extends JpaRepository<YourDomain, Serializable> {

    YourDomain findBysomeparameter(Long parameter);

}

除非您正在进行一些配置，否则SpringBoot会自动执行此操作

---

我希望这会有所帮助。

几个月前，当我开始学习Spring Boot时，我遇到了类似的问题。我不确定Spring是否认真对待目录结构。我的目录结构与@Pawan类似。您所要做的就是将存储库文件夹向上移动一级，即将其移动到父文件夹中。用@Service注释DeviceDao类。最后在@EnableJpaRepository中更新存储库路径。这对我有用。希望有此帮助。

删除

@EnableJpaRepositories、@EntityScan、@ComponentScan

注释并检查是否出现此异常。Springboot会自动进行很多配置，这些注释可能会对其产生不正确的影响。此外，您还应该在执行某些业务逻辑的类（如您的案例中的RegisterServiceImpl）上使用用户

@Service

注释

@Repository

annotation专用于负责从不同来源获取数据的类。不幸的是，它不起作用-由于项目的结构，我认为我需要显式使用3个注释。我已经添加了堆栈跟踪，您是否也可以发布

application.properties

文件？可能会有帮助。@KamilW。ServiceImpl类应该具有

@Service

而不是

@Repository

？将

应用程序

放入

com.abc

而不是

com.abc.init

。删除所有注释，但

@SpringBootApplication

除外。当我将接口更新为

公共接口idevicepository扩展了JpaRepository{}

并删除

@Repository

注释时，它仍然抛出相同的错误。至于注释-参见我对问题的最后一点评论-由于项目的结构，注释目前是必需的，但即使将

Application.java

类移动到

com.abc

包并删除注释，它仍然无法构建