通过“sessionFactory”未满足的依赖性； 没有可用的“org.hibernate.SessionFactory”类型的合格 bean

Question

我正在创建一个 spring-mvc 和 hibernate webapp。 我正在尝试通过创建项目（因此使用 xml 配置）来测试书中阅读的文本。 之前有人问过这种类型的问题，但我无法让我的项目使用所提供的答案。 当我到达终点时出现以下错误：

[WARNING] Exception encountered during context initialization - cancelling refresh attempt: org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'categoryController': Unsatisfied dependency expressed through field 'categoryService'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'categoryServiceImpl': Unsatisfied dependency expressed through field 'categoryDAO'; nested exception is org.springframework.beans.factory.UnsatisfiedDependencyException: Error creating bean with name 'categoryDAOImpl': Unsatisfied dependency expressed through field 'sessionFactory'; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No qualifying bean of type 'org.hibernate.SessionFactory' 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=sessionFactory)}
[ERROR] Context initialization failed

这是@Configuration class

@Configuration
@ComponentScan(basePackages= {"pizzaml.rest", "pizzaml.service", "pizzaml.dao"})
@EnableWebMvc
public class AppConfig {
    
    @Bean(name="sessionFactory")
    public SessionFactory sessionFactory( @Qualifier("dataSource") DataSource dataSource) throws MalformedURLException {
        LocalSessionFactoryBean sessionFactory = new LocalSessionFactoryBean();
            
        sessionFactory.setDataSource(dataSource);
        sessionFactory.setConfigLocation(new FileUrlResource("/hibernate-cfg.xml"));
        return sessionFactory.getObject();
    }
    
    @Bean(name="dataSource")
    public DataSource dataSource( @Value("{db.user}") String user, @Value("{db.pass}") String pass, @Value("{db.url}") String url, @Value("{db.driverclass}") String driverClass) {
        BasicDataSource datasource = new BasicDataSource();
        datasource.setDriverClassName(driverClass);
        datasource.setUsername(user);
        datasource.setPassword(pass);
        datasource.setUrl(url);
        
        return datasource;
    }
    
}

这是 hibernate-cfg.xml

<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
        
    <hibernate-configuration>
        
        <session-factory>
            <property name="dialect">org.hibernate.dialect.MySQL5Dialect</property>
            <property name="show_sql">true</property>
            <property name="hbm2ddl.auto">update</property>
            <mapping resource="pizzaml/entity/Category.hbm.xml"></mapping>
        </session-factory>
    
    </hibernate-configuration>

DAO-

@Repository
public class CategoryDAOImpl implements CategoryDAO {
    
    @Autowired
    @Qualifier("sessionFactory")
    SessionFactory sessionFactory;

    @Override
    public String addCategory(String categoryname) throws BusinessProcessException {
        
        Session session = sessionFactory.openSession();
        
        Query query = session.getNamedQuery("Category.byName");
        List<Category> list = query.list();
        
        if(Objects.nonNull(list) && (!list.isEmpty()) )
            throw new BusinessProcessException("Category already exists!");
        
        Category category = new Category();
        category.setName(categoryname);
        
        session.save(category);
        
        session.flush();
        
        session.close();
        
        return AppCodes.SUCCESS;
    }

}

pom.xml

  <dependencies>
  
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-webmvc -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-webmvc</artifactId>
        <version>5.2.10.RELEASE</version>
    </dependency>
    
    <!-- https://mvnrepository.com/artifact/javax.servlet/javax.servlet-api -->
    <dependency>
        <groupId>javax.servlet</groupId>
        <artifactId>javax.servlet-api</artifactId>
        <version>4.0.1</version>
        <scope>provided</scope>
    </dependency>
    
    <!-- https://mvnrepository.com/artifact/org.hibernate/hibernate-core -->
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>5.4.22.Final</version>
    </dependency>
    
    <!-- https://mvnrepository.com/artifact/org.apache.commons/commons-dbcp2 -->
    <dependency>
        <groupId>org.apache.commons</groupId>
        <artifactId>commons-dbcp2</artifactId>
        <version>2.8.0</version>
    </dependency>
    
    <!-- https://mvnrepository.com/artifact/org.springframework/spring-orm -->
    <dependency>
        <groupId>org.springframework</groupId>
        <artifactId>spring-orm</artifactId>
        <version>5.2.10.RELEASE</version>
    </dependency>

    <!-- https://mvnrepository.com/artifact/mysql/mysql-connector-java -->
    <dependency>
        <groupId>mysql</groupId>
        <artifactId>mysql-connector-java</artifactId>
        <version>8.0.22</version>
    </dependency>
    
    <!-- https://mvnrepository.com/artifact/com.fasterxml.jackson.core/jackson-databind -->
    <dependency>
        <groupId>com.fasterxml.jackson.core</groupId>
        <artifactId>jackson-databind</artifactId>
        <version>2.11.3</version>
    </dependency>
    
    
  </dependencies>
  
  <build>
    
    <plugins>
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-compiler-plugin</artifactId>
            <version>3.8.1</version>
            <configuration>
                <source>1.8</source>
                <target>1.8</target>
            </configuration>    
        </plugin>
        
        <plugin>
            <groupId>org.apache.maven.plugins</groupId>
            <artifactId>maven-war-plugin</artifactId>
            <version>3.2.3</version>
            <configuration>
                <outputDirectory>./target</outputDirectory>
            </configuration>
        </plugin>
        
        <plugin>
            <groupId>org.apache.tomcat.maven</groupId>
            <artifactId>tomcat7-maven-plugin</artifactId>
            <version>2.2</version>
            <configuration>
                <port>4500</port>
                <path>/</path>
            </configuration>
        </plugin>
        
    </plugins>

Answer 1

您的 Hibernate 映射可能有问题，但由于您没有发布有助于理解错误原因的整个堆栈跟踪，因此没有多少人可以帮助您。 除此之外，我强烈建议您对 Hibernate 使用注释 model，因为在即将发布的版本之一中，HBM XML 方法将被 JPA orm.xml 方法取代。

Answer 2

我为此做了一个解决方法。

而不是执行 localSessionFactoryBean.getObject() 来获取 hibernate session 工厂。

我使用 hibernate 的配置 class 创建 session 工厂 object。唯一的问题是我想提供自己的数据源。 为此，我创建了一个实现了 ConnectionProvider 接口的 class。 并在 hibernate.cfg.xml 中设置属性 - hibernate.connection.provider_class。

它开始工作了。

不过，我同意其他评论，hbm.xmls 是旧的做事方式。 我将学习注释并在未来的项目中开始使用它们。