Java Spring引导：需要一个名为'；实体管理工厂&x27；那是找不到的

错误：

说明：

nashtech.TiennguenM3.config.DataSeedingListener中的Field userRepository需要找不到类型为“nashtech.TiennguenM3.dao.IUserRepository”的bean

行动：

考虑在配置中定义“nashtech.tienngueyenm3.dao.IUserRepository”类型的bean

代码：

DataSeedingListener.java

package nashtech.tiennguyenm3.config;

import java.util.HashSet;

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.context.ApplicationListener;
import org.springframework.context.event.ContextRefreshedEvent;
import org.springframework.security.crypto.password.PasswordEncoder;
import org.springframework.stereotype.Component;

import nashtech.tiennguyenm3.dao.IRoleRepository;
import nashtech.tiennguyenm3.dao.IUserRepository;
import nashtech.tiennguyenm3.model.Role;
import nashtech.tiennguyenm3.model.User;

@Component
public class DataSeedingListener implements ApplicationListener<ContextRefreshedEvent> {
    
    @Autowired
    private IUserRepository userRepository;

    @Autowired
    private IRoleRepository roleRepository;

    @Autowired 
    private PasswordEncoder passwordEncoder;

    @Override
    public void onApplicationEvent(ContextRefreshedEvent arg0) {
        // Roles
        if (roleRepository.findByName("ROLE_ADMIN") == null) {
            roleRepository.save(new Role("ROLE_ADMIN"));
        }

        if (roleRepository.findByName("ROLE_MEMBER") == null) {
            roleRepository.save(new Role("ROLE_MEMBER"));
        }

        // Admin account
        if (userRepository.findByEmail("admin@gmail.com") == null) {
            User admin = new User();
            admin.setEmail("admin@gmail.com");
            admin.setPassword(passwordEncoder.encode("123456"));
            HashSet<Role> roles = new HashSet<>();
            roles.add(roleRepository.findByName("ROLE_ADMIN"));
            roles.add(roleRepository.findByName("ROLE_MEMBER"));
            admin.setRoles(roles);
            userRepository.save(admin);
        }

        // Member account
        if (userRepository.findByEmail("member@gmail.com") == null) {
            User user = new User();
            user.setEmail("member@gmail.com");
            user.setPassword(passwordEncoder.encode("123456"));
            HashSet<Role> roles = new HashSet<>();
            roles.add(roleRepository.findByName("ROLE_MEMBER"));
            user.setRoles(roles);
            userRepository.save(user);
        }
    }
}

---

当我在@SpringBootApplication之后添加（scanBasePackages={“nashtech.tiennguyenm3”）时，会发生此错误。

为了创建

@Repository

bean，您需要用

@EnableJpaRepositories

注释您的应用程序类

@SpringBootApplication(scanBasePackages={"nashtech.tiennguyenm3"})
@EnableJpaRepositories(basePackageClasses = IUserRepository.class) // <-- add this
public class MusicStoreApplication {

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

@SpringBootApplication（scanBasePackages={“nashtech.tiennguyenm3”}）
@如果您的所有存储库/dao都在包
nashtech.tiennguyenm3.dao下，则启用JParepositories（basePackageClasses=IUserRepository.class）//
然后，您可以添加：

@SpringBootApplication(scanBasePackages={"nashtech.tiennguyenm3"})
@EnableJpaRepositories(basePackages = "nashtech.tiennguyenm3.dao")
public class MusicStoreApplication {

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

如果它们位于不同的包中，则可以添加以下内容：

@SpringBootApplication(scanBasePackages={"nashtech.tiennguyenm3"})
@EnableJpaRepositories(basePackages = { "nashtech.tiennguyenm3.dao", "the.other.package"})
public class MusicStoreApplication {

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

您是否在
application.properties
（或
application.yml
）中配置了数据库连接？我在POST中添加了application.properties。为什么要从自动配置中排除类？对不起，我不明白！我在哪里从自动配置中排除了类？在EnableAutoConfiguration注释中，
nashtech.tienngueyenm3.dao.IRoleRepository
也会被启用吗？我们试试看：）。应该是的，因为它在同一个包裹里
basePackageClasses
只是
basePackages
的一种类型安全的替代方案，我可以，但我觉得您的答案需要进一步澄清。另外，我假设您在回答OP的问题时，已经用完整的代码亲自尝试过：）
@SpringBootApplication(scanBasePackages={"nashtech.tiennguyenm3"})
@EnableJpaRepositories(basePackageClasses = IUserRepository.class) // <-- add this
public class MusicStoreApplication {

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

@SpringBootApplication(scanBasePackages={"nashtech.tiennguyenm3"})
@EnableJpaRepositories(basePackages = "nashtech.tiennguyenm3.dao")
public class MusicStoreApplication {

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

@SpringBootApplication(scanBasePackages={"nashtech.tiennguyenm3"})
@EnableJpaRepositories(basePackages = { "nashtech.tiennguyenm3.dao", "the.other.package"})
public class MusicStoreApplication {

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