在Spring Boot中无法自动连接@Repository注释接口

Question

我正在开发一个spring boot应用程序，我遇到了一个问题。我正在尝试注入一个@Repository注释接口，但它似乎根本不起作用。我收到这个错误

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'springBootRunner': Injection of autowired dependencies failed; nested exception is org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.pharmacy.persistence.users.dao.UserEntityDao com.pharmacy.config.SpringBootRunner.userEntityDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.pharmacy.persistence.users.dao.UserEntityDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:334)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1202)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:537)
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:476)
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:303)
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:230)
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:299)
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:194)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:755)
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:757)
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:480)
    at org.springframework.boot.context.embedded.EmbeddedWebApplicationContext.refresh(EmbeddedWebApplicationContext.java:118)
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:686)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:320)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:957)
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:946)
    at com.pharmacy.config.SpringBootRunner.main(SpringBootRunner.java:25)
Caused by: org.springframework.beans.factory.BeanCreationException: Could not autowire field: com.pharmacy.persistence.users.dao.UserEntityDao com.pharmacy.config.SpringBootRunner.userEntityDao; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.pharmacy.persistence.users.dao.UserEntityDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:561)
    at org.springframework.beans.factory.annotation.InjectionMetadata.inject(InjectionMetadata.java:88)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:331)
    ... 16 common frames omitted
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type [com.pharmacy.persistence.users.dao.UserEntityDao] found for dependency: expected at least 1 bean which qualifies as autowire candidate for this dependency. Dependency annotations: {@org.springframework.beans.factory.annotation.Autowired(required=true)}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoSuchBeanDefinitionException(DefaultListableBeanFactory.java:1301)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1047)
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:942)
    at org.springframework.beans.factory.annotation.AutowiredAnnotationBeanPostProcessor$AutowiredFieldElement.inject(AutowiredAnnotationBeanPostProcessor.java:533)
    ... 18 common frames omitted

package com.pharmacy.config;

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


@SpringBootApplication
@ComponentScan("org.pharmacy")
public class SpringBootRunner {


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

实体类：

package com.pharmacy.persistence.users;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;



@Entity
public class UserEntity {

    @Id
    @GeneratedValue
    private Long id;
    @Column
    private String name;

}

存储库接口：

package com.pharmacy.persistence.users.dao;

import com.pharmacy.persistence.users.UserEntity;
import org.springframework.data.repository.CrudRepository;
import org.springframework.stereotype.Repository;


@Repository
public interface UserEntityDao extends CrudRepository<UserEntity,Long>{

}

控制器：

package com.pharmacy.controllers;

import com.pharmacy.persistence.users.UserEntity;
import com.pharmacy.persistence.users.dao.UserEntityDao;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;


@RestController
public class HomeController {


    @Autowired
    UserEntityDao userEntityDao;

    @RequestMapping(value = "/")
    public String hello() {
        userEntityDao.save(new UserEntity("ac"));
        return "Test";

    }
}

buildscript {
    ext {
        springBootVersion = '1.2.2.RELEASE'
    }
    repositories {
        mavenCentral()
    }
    dependencies {
        classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
    }
}

apply plugin: 'java'
apply plugin: 'idea'
apply plugin: 'spring-boot'
mainClassName = "com.pharmacy.config.SpringBootRunner"
jar {
    baseName = 'demo'
    version = '0.0.1-SNAPSHOT'
}


repositories {
    mavenCentral()
}


dependencies {
    compile("org.springframework.boot:spring-boot-starter-data-jpa")
    compile("org.springframework.boot:spring-boot-starter-web")
    compile("org.springframework.boot:spring-boot-starter-ws")
    compile("postgresql:postgresql:9.0-801.jdbc4")

    testCompile("org.springframework.boot:spring-boot-starter-test")
}

spring.view.prefix: /
spring.view.suffix: .html

spring.jpa.database=POSTGRESQL
spring.jpa.show-sql=false
spring.jpa.hibernate.ddl-auto=update


spring.datasource.driverClassName=org.postgresql.Driver
spring.datasource.url=jdbc:postgresql://localhost:5432/postgres
spring.datasource.username=postgres
spring.datasource.password=abc123

Answer 1

您的@componentscan注释似乎没有正确设置。尝试：

@ComponentScan(basePackages = {"com.pharmacy"})

实际上，如果主类位于结构的顶部，例如直接位于com.pharmace包下，则不需要组件扫描。

同样，你也不需要两者兼备

@SpringBootApplication
@EnableAutoConfiguration

默认情况下，@SpringBootApplication批注包括@EnableAutoConfiguration。