java - 我尝试运行该应用程序，但由于必需的bean而失败

描述：

com.rst.boot.services.impl.UserServiceImpl中的字段userRepository需要找不到名为'entityManagerFactory'的bean。

行动：

考虑在配置中定义一个名为“ entityManagerFactory”的bean。

这是我的服务班级：

@Service
public class UserServiceImpl implements UserServices {

    @Autowired
    private UserRepository userRepository;

    @Override
    public List<UserDTO> findAllUsers() {
       List<UserDTO> allusers= userRepository.findAll();
       return allusers;
    }

    @Override
    public String saveUser(UserDTO userdata) {
        userRepository.save(userdata);
        return "Data saved";
    }
}

<?xml version="1.0" encoding="UTF-8"?>

http://maven.apache.org/xsd/maven-4.0.0.xsd“>
    4.0.0

<groupId>org.example</groupId>
<artifactId>Leaning</artifactId>
<version>1.0-SNAPSHOT</version>
<name>Springboot Demo App</name>

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.0.2.RELEASE</version>
</parent>

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-data-jpa</artifactId>
    </dependency>
    <dependency>
        <groupId>org.hibernate</groupId>
        <artifactId>hibernate-core</artifactId>
        <version>5.0.7.Final</version>
    </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>
        <exclusions>
            <exclusion>
                <groupId>org.junit.vintage</groupId>
                <artifactId>junit-vintage-engine</artifactId>
            </exclusion>
        </exclusions>
    </dependency>
    <dependency>
        <groupId>javax.persistence</groupId>
        <artifactId>javax.persistence-api</artifactId>
        <version>2.2</version>
    </dependency>


</dependencies>

最佳答案

首先，在您的bootstrap类中，确保您具有@EnableAutoConfiguration批注。如果您有@SpringBootApplication，应该足够了，因为后者用第一个注释。

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

其次，确保UserRepository扩展了JpaRepository或CrudRepository：

public interface UserRepository extends JpaRepository<User, Long> {}

最后，检查您的Maven或Gradle配置中是否具有正确的依赖项。例如。

<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-data-jpa</artifactId>
</dependency>