Spring Boot + Hibernate-未映射实体+最佳配置方式

我正在尝试使用hibernate学习spring-boot基本注释配置，以使自己成为始终可用的模板。

我正在STS（spring工具套件）3.8.3上使用spring-boot最新发行版1.51。

这是我的主要内容：

@SpringBootApplication
@EnableAutoConfiguration
public class DemoApplication {

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

现在，我知道会@SpringBootApplication自动提供@componetScan，因此我没有添加它。

我的配置类：

@Configuration
@EnableTransactionManagement
@EnableJpaRepositories(entityManagerFactoryRef = "someEntityManagerFactory", transactionManagerRef = "someTransactionManager", basePackages = {
        "com.example.*" })
@EntityScan(basePackages = "com.demo.models")
@ConfigurationProperties(prefix = "mysql.datasource")
public class DataBaseConfig {

    @Autowired
    private Environment env;

    @Bean
    public DataSource someDataSource() {
        DriverManagerDataSource dataSource = new DriverManagerDataSource();
        dataSource.setDriverClassName(env.getProperty("mysql.datasource.driver-class-name"));
        dataSource.setUrl(env.getProperty("mysql.datasource.url"));
        dataSource.setUsername(env.getProperty("mysql.datasource.username"));
        dataSource.setPassword(env.getProperty("mysql.datasource.password"));
        return dataSource;
    }

    @Bean
    public LocalContainerEntityManagerFactoryBean someEntityManagerFactory() {
        LocalContainerEntityManagerFactoryBean em = new LocalContainerEntityManagerFactoryBean();
        em.setDataSource(someDataSource());
        em.setPackagesToScan(new String[] { "org.openlegacy.analytics.models" });
        JpaVendorAdapter vendorAdapter = new HibernateJpaVendorAdapter();
        em.setJpaVendorAdapter(vendorAdapter);
        em.setJpaProperties(additionalProperties());

        return em;
    }

    @Bean
    public PlatformTransactionManager someTransactionManager() {
        JpaTransactionManager tm = new JpaTransactionManager();
        tm.setEntityManagerFactory(someEntityManagerFactory().getObject());
        tm.setDataSource(someDataSource());
        return tm;
    }

    Properties additionalProperties() {
        Properties properties = new Properties();
        properties.setProperty("hibernate.hbm2ddl.auto", env.getProperty("spring.jpa.hibernate.ddl-auto"));
        properties.setProperty("hibernate.dialect", env.getProperty("spring.jpa.properties.hibernate.dialect"));
        properties.setProperty("spring.jpa.show-sql", env.getProperty("spring.jpa.show-sql"));
        properties.setProperty("spring.jpa.hibernate.naming.physical-strategy",
                env.getProperty("spring.jpa.hibernate.naming.physical-strategy"));
        return properties;
    }

}

我的控制器类：

@RestController
@RequestMapping("/users")
public class UserController {

    @Autowired
    private UserRepository userRipository;

    @RequestMapping(value = "", method = RequestMethod.GET)
    public List<User> getItems() {
        return userRipository.getUsers();
    }

    @RequestMapping(value = "/message", method = RequestMethod.GET)
    public String getMessage() {
        return userRipository.getMessage();
    }

}

我的存储库类：

@Transactional
@Repository
public class UserRepository {

    @PersistenceContext
    private EntityManager entityManager;

    @SuppressWarnings("unchecked")
    public List<User> getUsers() {
        return entityManager.createQuery("select u from User u").getResultList();
    }

    public String getMessage() {
        return "hello";
    }
}

我的实体课：

@Entity(name = "user")
public class User implements Serializable {

    private static final long serialVersionUID = 1L;

    @Id
    @GeneratedValue(strategy = GenerationType.AUTO)
    private Integer id;

    @Column(name = "user_name")
    private String userName;

    @Column(name = "password")
    private String password;

    public Integer getId() {
        return id;
    }

    public void setId(Integer id) {
        this.id = id;
    }

    public String getUserName() {
        return userName;
    }

    public void setUserName(String userName) {
        this.userName = userName;
    }

    public String getPassword() {
        return password;
    }

    public void setPassword(String password) {
        this.password = password;
    }
}

和我的属性文件：

# DataSource settings: set here your own configurations for the database connection.
mysql.datasource.username=openlegacy
mysql.datasource.password=openlegacy
mysql.datasource.driver-class-name=com.mysql.jdbc.Driver
mysql.datasource.url=jdbc:mysql://localhost:3306/olbank
spring.jpa.database= MYSQL

spring.data.jpa.repositories.enabled=true
#spring.jpa.database-platform=org.hibernate.dialect.MYSQL5Dialect

# Show or not log for each sql query
spring.jpa.show-sql = true

# Hibernate ddl auto (create, create-drop, update)
spring.jpa.hibernate.ddl-auto = update

# Naming strategy
#spring.jpa.hibernate.naming.strategy= org.hibernate.cfg.ImprovedNamingStrategy
spring.jpa.hibernate.naming.physical-strategy= org.hibernate.boot.model.naming.PhysicalNamingStrategyStandardImpl

# The SQL dialect makes Hibernate generate better SQL for the chosen database
spring.jpa.properties.hibernate.dialect = org.hibernate.dialect.MySQL5Dialect

当我试图从用户表中检索数据时，出现此错误：

org.hibernate.hql.internal.ast.QuerySyntaxException：用户未映射...

我的问题是：

1. 为什么我会收到此错误？我知道该用户是通过类名映射的，这就是我正在做的

2. 这是用spring-boot配置休眠模式的最佳方法吗？对我而言，按照最佳实践编写代码很重要。

请给出详细的答案，以便我可以学习。

任何其他有用的信息都欢迎:)

谢谢。