类未映射

Question

我有配置hibernate的问题，从DB获取所有实体的列表。我错过了什么，但不知道是什么。这是我的实体和cfg.xml配置文件： 插入实体到DB没有问题，只有从DB获取它的问题。 实体看起来像这样：

@Entity
public class Person {

    @Id
    @GeneratedValue
    private long id;

    private String name;

    private int age;

    {getters setters}

    @Override
    public String toString() {
        return "Person [id=" + id + ", name=" + name + ", age=" + age + "]";
    }
}

和主要课程：

public static void main(String[] args) {
        EntityManagerFactory entityManagerFactory = Persistence.createEntityManagerFactory("myh2");
        EntityManager entityManager = entityManagerFactory.createEntityManager();
        createPerson(entityManager);

        Configuration configuration = new Configuration().configure();
        StandardServiceRegistryBuilder builder = new StandardServiceRegistryBuilder().
        applySettings(configuration.getProperties());
        SessionFactory factory = configuration.buildSessionFactory(builder.build());

        Session session = factory.openSession();
        String hql = "select p from " + Person.class.getSimpleName() + " p";
        List<Person> list = (List<Person>) session.createQuery(hql).list();
        System.out.println(list);
        session.close();


        entityManager.close();
        entityManagerFactory.close();
    }

hibernate.cfg.xml文件看起来像这样（我也尝试添加映射类，但也会出现同样的问题）

<hibernate-configuration>
    <session-factory>
        <!-- Database connection settings -->
        <property name="connection.driver_class">org.h2.Driver</property>
        <property name="connection.url">jdbc:h2:./db/repository</property>

        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>

        <!-- SQL dialect -->
        <property name="dialect">org.hibernate.dialect.H2Dialect</property>

        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.internal.NoCacheProvider</property>

        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>

        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">create</property>
        <!-- <mapping class="second.level.cache.Person"/> -->
    </session-factory>
</hibernate-configuration>