Java Spring启动应用程序无法启动，因为找不到自动连线bean

我的应用程序：-

    @SpringBootApplication
    @ComponentScan("fi.ma.vegshopping")
    @EnableJpaRepositories("fi.ma.vegshopping")
    @EntityScan(basePackages = "fi.ma.vegshopping")
    public class VegShoppingApplication {

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

问题类别：-

import fi.ma.vegshopping.dao.AccountDAO;
import fi.ma.vegshopping.entity.Account;

@Service
public class MyDBAuthenticationService implements UserDetailsService {

    @Autowired
    private AccountDAO accountDAO;

    @Override
    public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
        Account account = accountDAO.findAccount(username); 
        System.out.println("Account= " + account);

        if (account == null) {
            throw new UsernameNotFoundException("User " //
                    + username + " was not found in the database");
        }

        // EMPLOYEE,MANAGER,..
        String role = account.getUserRole();

        List<GrantedAuthority> grantList = new ArrayList<GrantedAuthority>();

        // ROLE_EMPLOYEE, ROLE_MANAGER
        GrantedAuthority authority = new SimpleGrantedAuthority("ROLE_" + role);

        grantList.add(authority);

        boolean enabled = account.isActive();
        boolean accountNonExpired = true;
        boolean credentialsNonExpired = true;
        boolean accountNonLocked = true;

        UserDetails userDetails = (UserDetails) new User(account.getUserName(), //
                account.getPassword(), enabled, accountNonExpired, //
                credentialsNonExpired, accountNonLocked, grantList);

        return userDetails;
    }

}

AccountDAOImpl类：-

    package fi.ma.vegshopping.impl;

    import javax.transaction.Transactional;

    import org.hibernate.Criteria;
    import org.hibernate.Session;
    import org.hibernate.SessionFactory;
    import org.hibernate.criterion.Restrictions;
    import org.springframework.beans.factory.annotation.Autowired;

    import fi.ma.vegshopping.dao.AccountDAO;
    import fi.ma.vegshopping.entity.Account;


    @Transactional
    public class AccountDAOImpl implements AccountDAO {

        @Autowired
        private SessionFactory sessionFactory;

        @Override
        public Account findAccount(String userName ) {
            Session session = sessionFactory.getCurrentSession();
            Criteria crit = session.createCriteria(Account.class);
            crit.add(Restrictions.eq("userName", userName));
            return (Account) crit.uniqueResult();
        }
    }

错误：-

---

应用程序无法启动

---

说明：

fi.ma.vegshopping.authentication.MyDBAuthenticationService中的字段accountDAO需要找不到类型为“fi.ma.vegshopping.dao.accountDAO”的bean

行动：

---

考虑在您的配置中定义“fi.ma.vegshopping.dao.AccountDAO”类型的bean。

问题可能在于包结构，您需要将

@Component

标记到

AccountDAOImpl

类（在

fi.ma.vegshopping.impl

包下）如下所示，以便容器可以扫描并找到要注入的bean

@Component //or @Repository
public class AccountDAOImpl implements AccountDAO {
  //add your code here
}

---

尝试在您的帐户daoimpl上添加

@Repository

。我不明白您为什么不理解异常消息。它清楚地表明，没有类型为

AccountDAO

的Spring管理bean，并且您还没有向

AccountDAOImpl

类添加任何Anotion使其成为一个。异常和解决方案都很明显。我在AccountDAOImpl类中尝试了@Component和@Repository。我还在VegShoppingApplication类中尝试了@ComponentScan（“fi.ma.vegshopping.impl”）@EnableJpaRepositories（“fi.ma.vegshopping.impl”）@EntityScan（basePackages=“fi.ma.vegshopping.impl”）。什么都不管用。仍然是相同的错误。我在AccountDAOImpl类中尝试了@Component和@Repository。我还在VegShoppingApplication类中尝试了@ComponentScan（“fi.ma.vegshopping.impl”）@EnableJpaRepositories（“fi.ma.vegshopping.impl”）@EntityScan（basePackages=“fi.ma.vegshopping.impl”）。什么都不管用。仍然是相同的错误。AccountDAO不应该扩展例如Crudepository？如果您使用的是spring数据jpa，您可以

@Component //or @Repository
public class AccountDAOImpl implements AccountDAO {
  //add your code here
}