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mysql - 即使提供了 Bean，SessionFactory 也不会自动装配

问题描述

集成 spring boot 和 hibernate，但自动装配存在问题，SessionFactory因为它说 bean 没有提供，但@Bean在 Configuration 类中提供。

请看一下代码。

项目结构

Dao 层尚未提供，因为我遇到了 SessionFactory 自动装配问题。

主要应用类

package com.ctechm.ctec;

 import java.util.Arrays;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.CommandLineRunner;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.context.ApplicationContext;
import org.springframework.context.annotation.ComponentScan;
import org.springframework.data.repository.CrudRepository;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;

import com.ctechm.ctec.service.ServiceImpl;

@SpringBootApplication
public class CtecApplication implements CommandLineRunner{

 @Autowired
private ApplicationContext appContext;

@Autowired 
Text text;

@Autowired
ServiceImpl serviceImpl;
@Autowired
SessionFactory sessionFactory;

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

   }

@Autowired上面的代码中提供了注释，它们@Bean在 Configuration 类中定义。它适用于除 SessionFactory 之外的所有自动装配。

配置类

 package com.ctechm.ctec;

 import java.util.Properties;

 import javax.persistence.EntityManagerFactory;
 import javax.sql.DataSource;

import org.hibernate.SessionFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.annotation.Bean;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate5.LocalSessionFactoryBean;
import org.springframework.orm.jpa.vendor.HibernateJpaSessionFactoryBean;
import org.springframework.transaction.annotation.EnableTransactionManagement;
import org.springframework.context.annotation.Configuration;
@Configuration
public class Configuration {

 @Bean
 public Text text() {
    return new Text();
 }


@Bean
public Text texter(){
    return new Text();
}

    @Bean
    public DataSource dataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName("com.mysql.jdbc.Driver");
        dataSource.setUrl("jdbc:mysql://localhost:3306/scm");
        dataSource.setUsername("root");
        dataSource.setPassword("password");
        return dataSource;
     }

 @Bean
public LocalSessionFactoryBean sessionFactory() {
    Properties properties = new Properties();
    LocalSessionFactoryBean bean=new LocalSessionFactoryBean();
     bean.setDataSource(dataSource());
         properties.setProperty("hibernate.connection.url","jdbc:mysql://localhost:3306/scm");      properties.setProperty("hibernate.dialect","org.hibernate.dialect.MySQLDialect"); 
         properties.setProperty("hibernate.hbm2ddl.auto", "update");
       properties.setProperty("hibernate.connection.username","root");
       properties.setProperty("hibernate.connection.password","password");
       bean.setHibernateProperties(properties);
     return bean;
    }

     }

服务等级

package com.ctechm.ctec.service;

import java.lang.annotation.Annotation;

 import com.ctechm.ctec.service.Service;

@Service   
public class ServiceImpl implements Service {


 }

应用程序属性

 spring.datasource.url=jdbc:mysql://localhost:3306/scm
spring.datasource.username=root
spring.datasource.password=password
spring.jpa.properties.hibernate.format_sql = true
spring.jpa.hibernate.ddl-auto=none

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.ctechm</groupId>
<artifactId>ctec</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>ctec</name>
<description>Demo project for Spring Boot</description>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.3.RELEASE</version>
    <relativePath/> <!-- lookup parent from repository -->
</parent>

<properties>
    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
    <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
    <java.version>1.8</java.version>
</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>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <scope>runtime</scope>
     </dependency>
     <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
     </dependency>
    </dependencies>

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


 </project>

当我启动控制台时出现这样的错误

org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'jpaContext': Unsatisfied dependency expressed through constructor parameter 0; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.util.Set<javax.persistence.EntityManager>' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:732) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.autowireConstructor(ConstructorResolver.java:197) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.autowireConstructor(AbstractAutowireCapableBeanFactory.java:1276) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBeanInstance(AbstractAutowireCapableBeanFactory.java:1133) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:543) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:503) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.lambda$doGetBean$0(AbstractBeanFactory.java:317) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:222) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:315) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:199) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:760) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:869) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.refresh(AbstractApplicationContext.java:550) ~[spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.boot.web.servlet.context.ServletWebServerApplicationContext.refresh(ServletWebServerApplicationContext.java:140) ~[spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.refresh(SpringApplication.java:759) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.refreshContext(SpringApplication.java:395) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:327) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1255) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at org.springframework.boot.SpringApplication.run(SpringApplication.java:1243) [spring-boot-2.0.3.RELEASE.jar:2.0.3.RELEASE]
    at com.ctechm.ctec.CtecApplication.main(CtecApplication.java:33) [classes/:na]
Caused by: org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'java.util.Set<javax.persistence.EntityManager>' available: expected at least 1 bean which qualifies as autowire candidate. Dependency annotations: {}
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.raiseNoMatchingBeanFound(DefaultListableBeanFactory.java:1509) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.doResolveDependency(DefaultListableBeanFactory.java:1104) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.resolveDependency(DefaultListableBeanFactory.java:1065) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.resolveAutowiredArgument(ConstructorResolver.java:818) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.beans.factory.support.ConstructorResolver.createArgumentArray(ConstructorResolver.java:724) ~[spring-beans-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    ... 19 common frames omitted

请看一下并建议我需要进行哪些更改。一件事是当我删除 bean 并自动装配 sessionFactory 时，一切正常。我尝试了 stackoverflow 中的所有帖子，但无法找出解决方案。

标签： mysqlhibernatespring-boot

解决方案

从您发布的代码中，不清楚您想在这里实现什么。使用 spring-boot 和 spring-data 你基本上可以用最少的配置启动应用程序。

在您的情况下，您可以跳过 Configuration.java 并使用可以直接添加到 application.properties 文件中的 Common Spring Boot 属性来配置数据库访问。

应用程序属性 
## Spring DATASOURCE (DataSourceAutoConfiguration & DataSourceProperties)
spring.datasource.url = jdbc:mysql://localhost:3306/scm?useSSL=false
spring.datasource.username = spring-test
spring.datasource.password = root


## Hibernate Properties
# The SQL dialect makes Hibernate generate better SQL for the chosen database

spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5InnoDBDialect

# Hibernate ddl auto (create, create-drop, validate, update)
spring.jpa.hibernate.ddl-auto = update

不需要自动装配 SessionFactory，相反，您可以添加一个 Repository 接口，该接口将扩展 JpaRepository 接口。这个接口已经定义了基本的 CRUD 操作。这是一个应该是什么样子的示例。

CtecRepository.java 
import org.springframework.data.jpa.repository.JpaRepository;
import java.util.List;

public interface CtecRepository extends JpaRepository<CtecEntity, String> {

   List<CtecEntity> findByName(String name);
}

您可以将您的存储库注入到服务类中，然后您可以从那里使用数据库。

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

import java.util.List;

@Service
public class CtecService {

@Autowired
private CtecRepository ctecRepository;


public void create() {
    CtecEntity entity = new CtecEntity();
    entity.setName("test name");
    ctecRepository.save(entity);
}


public List<CtecEntity> getAllByName(String name) {
    return ctecRepository.findByName(name);
}
}
CtecEntity.java 
import javax.persistence.Id;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Table;

@Entity
@Table(name = "ctec")
public class CtecEntity {

@Id
@GeneratedValue(strategy = GenerationType.IDENTITY)
private int id;

private String name;

public String getName() {
    return name;
}

public void setName(String name) {
    this.name = name;
}

public int getId() {
    return id;
}

public void setId(int id) {
    this.id = id;
}
}

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