我得到了FooBar is not mapped例外，即使我已經(jīng)放置了所有必要的注釋：模型類中的實(shí)體注解：模型/FooBar.java*@Data@Entity@Table(name = "ORDERS")public class FooBar {}DAO 中的 Repository、PersistenceContext 和 Transactioinal。另外，我正確地用類的名稱“FooBar”引用了它db/FooBarDao.java@Repositorypublic class OrderDAO {    @PersistenceContext    private EntityManager em;    @Transactional    public List<FooBar> getFooBars() {        return em.createQuery(                "select fb from FooBar fb",                FooBar.class        ).getResultList();    }}這是使其全部正常工作的配置：conf/DbConfig.java@EnableTransactionManagement@Configuration@ComponentScan(basePackages = {"project.db"})public class DbConfig {    @Autowired    public Environment env;    @Bean    public DataSource dataSource() {        System.out.println("Configuring database!!!!!!!!");        DriverManagerDataSource ds = new DriverManagerDataSource();        ds.setDriverClassName("org.hsqldb.jdbcDriver");        ds.setUrl("jdbc:hsqldb:mem:myjdbc");        new JdbcTemplate(ds)                .update(FileUtil.readFile2("./src/main/java/project/db/sql/initialize.sql"));        return ds;    }    @Bean    public PlatformTransactionManager transactionManager(            EntityManagerFactory entityManagerFactory) {        return new JpaTransactionManager(entityManagerFactory);    }    @Bean    public EntityManagerFactory entityManagerFactory() {        LocalContainerEntityManagerFactoryBean factory = new LocalContainerEntityManagerFactoryBean();        factory.setPersistenceProviderClass(HibernatePersistenceProvider.class);        factory.setPackagesToScan("model");        factory.setDataSource(dataSource());        factory.setJpaProperties(additionalProperties());        factory.afterPropertiesSet();        return factory.getObject();        }}