创建带有名称的bean时出错：通过字段表示的不满足的依赖关系

Question

@Controller
public class AccountController {

    @Autowired
    AccountService accountService;

@Service
public class AccountServiceImpl implements AccountService {

    @Autowired
    AccountDAO accountDao;
    
    
    //since we have added support for transaction manager
    //@Transactional is use to automatically begin and end transaction
    
    @Override
    @Transactional
    public boolean saveAccount(Account account) {
        return accountDao.saveAccount(account);
        //return false;
        // TODO Auto-generated method stub
        //return accountDao.saveAccount(account);
    }

@Repository
public class AccountDAOImpl implements AccountDAO {
    
    //we r @Autowiring sessionFactory cuz hibernate use sessionFactory for db connectivity
    @Autowired
    private SessionFactory sessionFactory;

    @Override
    public boolean saveAccount(Account account) {
        boolean saveFlag = true;
        
        AccountEntity accountEntity = new AccountEntity();
        accountEntity.setAccountNo(account.getAccountNo());
        accountEntity.setAccountHolderName(account.getAccountHolderName());
        accountEntity.setAccountType(account.getAccountType());
        accountEntity.setAccountBalance(account.getAccountBalance());
        accountEntity.setDateOfBirth(account.getDateOfBirth());
        accountEntity.setPsCode(account.getPsCode());
        
        try {
            Session currentSession = sessionFactory.getCurrentSession();
            currentSession.save(accountEntity);
        } catch (Exception e) {
            e.printStackTrace();
            saveFlag = false;
        }
        
        return saveFlag;
    }

<bean id="dataSource" class="com.mchange.v2.c3p0.ComboPooledDataSource" destroy-method="close">
        <property name="driverClass" value="com.mysql.jdbc.Driver" />
        <property name="jdbcUrl" value="jdbc:mysql://localhost:3306/psbankdb?useSSL=false" />
        <property name="user" value="psbankdb" />
        <property name="password" value="123" />
    </bean>
    
    <!-- sessionFactory is used to connect with db using above dataSource(ref="dataSource)" -->
    <bean id="sessionFactory"
        class="org.springframework.orm.hibernate5.LocalSessionFactoryBean">
        <property name="dataSource" ref="dataSource" />
        <property name="packagesToScan" ref="com.ps.springmvc.psbankApp" />
        <property name="hibernateProperties">
            <props>
                <prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
                <!-- to display sql property on the console while execution -->
                <prop key="hibernate.show_sql">true</prop>
            </props>
        </property>
    </bean>
    
    <!-- TransactionManager it uses session factory as ref -->
    <bean id="myTransactionManager" class="org.springframework.orm.hibernate5.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory"/>
    </bean>
    
    <!-- it allow us to use annotation to eliminate manual coding to start and stop transaction -->
    <tx:annotation-driven transaction-manager="myTransactionManager" />

获取低于错误

UnsatisfiedDependencyException：创建名为“Account Controller”的bean时出错：通过字段“Account Service”表示不满足的依赖关系；嵌套异常是org.springframework.beans.factory.unsatisfiedDependencyException：创建名为“Account ServiceImpl”的bean时出错：通过字段“Account DAO”表示未满足的依赖关系；嵌套异常是org.springframework.beans.factory.unsatisfiedDependencyException：创建名为“Account DAOImpl”的bean时出错：通过字段“session Factory”表示不满足的依赖关系；嵌套异常是org.springframework.beans.factory.beanCreationException：创建ServletContext资源[/WEB-INF/BankAppContext.xml]中定义的名为“session Factory”的bean时出错：在设置bean属性“Packages toscan”时，无法解析对bean“com.ps.springmvc.psbankApp”的引用；嵌套异常是org.springframework.beans.factory.nosuchbeandefinitionexception:没有名为'com.ps.springmvc.psbankapp'的bean可用postprocessor.java:399)org.springframework.beans.factory.support.abstractauTowireCapleBeanFactory.populateBean(abstractauTowireCapleBeanFactory.java:1422)org.springframework.beans.factory.java:1422)org.springframework.beans.factory.docreateBean(abstractauTowireCapleBeanFactory.beans.factory.javfactory.support.abstractbeanFactory.lambda$dogetbean$0(AbstractBeanFactory.java:323)

Answer 1

您得到此错误是因为spring boot在启动时找不到AccountServicebean。

NoSuchBeanDefinitionException的[spring-docs][of]解释了

当向BeanFactory请求无法找到定义的bean实例时引发的异常。这可能指向一个不存在的bean、一个非唯一的bean，或者一个没有关联bean定义的手动注册的单例实例。

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