Spring Boot 无法找到任何 bean，但同一个包中存在一个带有 @Entity 注释的类

Question

我正在尝试创建一个 todoService，其中注入了 TodoRepository 的依赖项，但是当我尝试运行该项目时，出现以下错误

上下文初始化期间遇到异常 - 取消刷新尝试：org.springframework.beans.factory.UnsatisfiedDependencyException：创建名称为“controller”的bean时出错：通过字段“todoservice”表达的依赖关系不满足：创建名称为“todoService”的bean时出错：依赖关系不满足通过字段“todoRepo”表示：没有合格的 bean 类型“com.ans.spring.boot.todoController.ToDoRepository”可用：预计至少有 1 个符合自动装配候选资格的 bean。依赖注释：{@org.springframework.beans.factory.annotation.Autowired(required=true)}

我的todoService类：

package com.ans.spring.boot.todoController;

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

@Service
public class todoService {

    @Autowired
    private ToDoRepository todoRepo;

    public List<Task> getalltasks()
    {
        List<Task> lists=new ArrayList<>();
        todoRepo.findAll().forEach(lists::add);

        return lists;
    }
}

任务.java

package com.ans.spring.boot.todoController;

import jakarta.persistence.Entity;
import jakarta.persistence.Id;

@Entity
public class Task {

    @Id
    Integer id;
    String name;
    String summary;
    String desc;

    public Task() {
    }
    //all getter and setter are implemented. Not pasting here

TodoRepository.java

package com.ans.spring.boot.todoController;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

@Repository
public interface ToDoRepository extends CrudRepository <Task,Integer>{
}

主课

package com.ans.spring.boot;


import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.autoconfigure.jdbc.DataSourceAutoConfiguration;

@SpringBootApplication(exclude = {DataSourceAutoConfiguration.class})
public class Main {
    public static void main(String[] args) {

        SpringApplication.run(Main.class,args);
        
    }
}

pom.xml：

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0"
         xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
         xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>com.ans.spring.boot</groupId>
    <artifactId>firstMavenProject</artifactId>
    <version>1.0-SNAPSHOT</version>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.3.2</version>
    </parent>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>

        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derby</artifactId>
            <scope>test</scope>
        </dependency>

    </dependencies>
    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    </properties>

</project>

详细日志：


2025-01-09T01:28:26.456+05:00 DEBUG 18056 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : Application failed to start due to an exception

org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'com.ans.spring.boot.repository.ToDoRepository' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1880) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1406) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1353) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:784) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:767) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:145) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:508) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1439) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:599) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:337) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:335) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.config.DependencyDescriptor.resolveCandidate(DependencyDescriptor.java:254) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1443) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1353) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.resolveFieldValue(AutowiredAnnotationBeanPostProcessor.java:784) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:767) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:145) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessProperties(AutowiredAnnotationBeanPostProcessor.java:508) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1439) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:599) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:522) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:337) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:234) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:335) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:200) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:975) ~[spring-beans-6.1.11.jar:6.1.11]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:971) ~[spring-context-6.1.11.jar:6.1.11]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:625) ~[spring-context-6.1.11.jar:6.1.11]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:146) ~[spring-boot-3.3.2.jar:3.3.2]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:754) ~[spring-boot-3.3.2.jar:3.3.2]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:456) ~[spring-boot-3.3.2.jar:3.3.2]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:335) ~[spring-boot-3.3.2.jar:3.3.2]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1363) ~[spring-boot-3.3.2.jar:3.3.2]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1352) ~[spring-boot-3.3.2.jar:3.3.2]
    at com.ans.spring.boot.Main.main(Main.java:13) ~[classes/:na]

2025-01-09T01:28:26.462+05:00 ERROR 18056 --- [           main] o.s.b.d.LoggingFailureAnalysisReporter   : 

***************************
APPLICATION FAILED TO START
***************************

Description:

Field todoRepo in com.ans.spring.boot.todoController.todoService required a bean of type 'com.ans.spring.boot.repository.ToDoRepository' that could not be found.

The injection point has the following annotations:
    - @org.springframework.beans.factory.annotation.Autowired(required=true)


Action:

Consider defining a bean of type 'com.ans.spring.boot.repository.ToDoRepository' in your configuration.

我尝试创建子包名称存储库，我也在主类中完成了此操作： @EnableJpaRepositories(basePackages = "com.ans.spring.boot.todoController")

但是徒劳无功。

Answer 1

项目树

firstMavenProject
├── pom.xml
└── src
    └── main
        ├── java
        │   └── com
        │       └── ans
        │           └── spring
        │               └── boot
        │                   ├── Main.java
        │                   └── todoController
        │                       ├── Task.java
        │                       ├── ToDoController.java
        │                       ├── ToDoRepository.java
        │                       └── ToDoService.java
        └── resources
            └── application.properties

pom.xml

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>
    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>3.4.1</version>
        <relativePath/> <!-- lookup parent from repository -->
    </parent>
    <groupId>com.ans.spring.boot</groupId>
    <artifactId>firstMavenProject</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <name>FirstMavenProject</name>
    <description>Demo project for Spring Boot</description>
    <properties>
        <maven.compiler.source>17</maven.compiler.source>
        <maven.compiler.target>17</maven.compiler.target>
        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-data-jpa</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derby</artifactId>
            <scope>runtime</scope>
        </dependency>
        <dependency>
            <groupId>org.apache.derby</groupId>
            <artifactId>derbytools</artifactId>
            <scope>runtime</scope>
        </dependency>
        
<!-- OPTIONAL ADD FOR H2 WEB CONSOLE -->
        <dependency>
            <groupId>com.h2database</groupId>
            <artifactId>h2</artifactId>
            <scope>runtime</scope>
        </dependency>

    </dependencies>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

</project>

任务.java

package com.ans.spring.boot.todoController;

import jakarta.persistence.Entity;
import jakarta.persistence.Id;

@Entity
public class Task {
    @Id
    private
    Integer Id;
    private String Name;
    private String Summary;
    private String Description;


    public Integer getId() {
        return Id;
    }

    public void setId(Integer id) {
        Id = id;
    }

    public String getName() {
        return Name;
    }

    public void setName(String name) {
        Name = name;
    }

    public String getSummary() {
        return Summary;
    }

    public void setSummary(String summary) {
        Summary = summary;
    }

    public String getDescription() {
        return Description;
    }

    public void setDescription(String description) {
        Description = description;
    }
}

ToDoRepository.java

package com.ans.spring.boot.todoController;

//import org.springframework.data.jpa.repository.JpaRepository;

import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;

@Repository
//public interface ToDoRepository extends JpaRepository<Task, Integer> {
public interface ToDoRepository extends CrudRepository<Task, Integer> {

}

ToDoService.java

package com.ans.spring.boot.todoController;

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

import java.util.ArrayList;
import java.util.List;
import java.util.Optional;

@Service
public class ToDoService {
    @Autowired
    private ToDoRepository todoRepo;

    public List<Task> getAllTasks() {
        //return (List<Task>) todoRepo.findAll();
        
        List<Task> lists = new ArrayList<>();
        todoRepo.findAll().forEach(lists::add);
        return lists;        
    }

    public Optional<Task> getTaskById(Integer id) {
        return todoRepo.findById(id);
    }

    public Task createTask(Task task) {
        return todoRepo.save(task);
    }

    public Task updateTask(Integer id, Task updatedTask) {
        return todoRepo.findById(id).map(task -> {
            task.setName(updatedTask.getName());
            task.setSummary(updatedTask.getSummary());
            task.setDescription(updatedTask.getDescription());
            return todoRepo.save(task);
        }).orElseThrow(() -> new RuntimeException("Task not found with id: " + id));
    }

    public void deleteTask(Integer id) {
        todoRepo.deleteById(id);
    }
}

ToDoController.java

package com.ans.spring.boot.todoController;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.*;

import java.util.List;
import java.util.Optional;

@RestController
@RequestMapping("/api/todoList")
public class ToDoController {
    @Autowired
    private ToDoService todoService;

    @GetMapping
    public List<Task> getAllTasks() {
        return todoService.getAllTasks();
    }

    @GetMapping("/{id}")
    public Optional<Task> getTaskById(@PathVariable Integer id) {
        return todoService.getTaskById(id);
    }

    @PostMapping
    public Task createTask(@RequestBody Task task) {
        return todoService.createTask(task);
    }

    @PutMapping("/{id}")
    public Task updateTask(@PathVariable Integer id, @RequestBody Task updatedTask) {
        return todoService.updateTask(id, updatedTask);
    }

    @DeleteMapping("/{id}")
    public void deleteTask(@PathVariable Integer id) {
        todoService.deleteTask(id);
    }
}

Main.java

package com.ans.spring.boot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

应用程序.属性

spring.application.name=FirstMavenProject

# spring.datasource.url=jdbc:h2:mem:testdb
# spring.datasource.driverClassName=org.h2.Driver
# spring.jpa.database-platform=org.hibernate.dialect.H2Dialect

spring.datasource.url=jdbc:derby:test;create=true
spring.datasource.driver-class-name=org.apache.derby.jdbc.EmbeddedDriver
spring.jpa.database-platform=org.hibernate.dialect.DerbyDialect

spring.datasource.username=sa
spring.datasource.password=
spring.jpa.hibernate.ddl-auto=update
spring.jpa.show-sql=true
spring.jpa.properties.hibernate.format_sql=true

# http://localhost:8080/h2-console
spring.h2.console.enabled=true
spring.h2.console.path=/h2-console

构建并运行

构建

mvn clean package

奔跑

java -jar target/firstMavenProject-0.0.1-SNAPSHOT.jar

测试

测试 1 - 创建任务

打开命令行终端，然后运行命令：

curl -X POST http://localhost:8080/api/todoList \
-H "Content-Type: application/json" \
-d '{
  "id": 1,
  "name": "Learn Spring Boot",
  "summary": "Spring Boot Basics",
  "description": "Learn how to create a Spring Boot application."
}'

打开浏览器

http://localhost:8080/h2-console

测试 2 - 获取所有任务

打开命令行终端，然后运行命令：

curl -X GET http://localhost:8080/api/todoList

测试 3 - 删除任务

curl -X DELETE http://localhost:8080/api/todoList/1

注意

实体任务

请勿使用名称
```
desc
```
，它是 Derby 保留字。将其与 Derby 一起使用将导致错误。（将
```
desc
```
更改为
```
private String Description;
```
）
属性名称，每个单词的首字母大写。（将
```
name
```
更改为
```
private String Name;
```
）

主要

Spring主应用程序使用默认值，不需要其他设置。

package com.ans.spring.boot;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;

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

pom.xml

添加插件

<build>
        <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
        </plugins>
    </build>

Spring Boot 无法找到任何 bean，但同一个包中存在一个带有 @Entity 注释的类

问题描述投票：0回答：1

1个回答

项目树

pom.xml

任务.java

ToDoRepository.java

ToDoService.java

ToDoController.java

Main.java

应用程序.属性

构建并运行

构建

奔跑

测试

测试 1 - 创建任务

打开浏览器

测试 2 - 获取所有任务

测试 3 - 删除任务

注意

实体任务

主要

pom.xml

最新问题

Spring Boot 无法找到任何 bean，但同一个包中存在一个带有 @Entity 注释的类

问题描述 投票：0回答：1

1个回答

项目树

pom.xml

任务.java

ToDoRepository.java

ToDoService.java

ToDoController.java

Main.java

应用程序.属性

构建并运行

构建

奔跑

测试

测试 1 - 创建任务

打开浏览器

测试 2 - 获取所有任务

测试 3 - 删除任务

注意

实体任务

主要

pom.xml

最新问题

问题描述投票：0回答：1