如何在jpa2中使用内存中的derby？

<persistence-unit name="myPersistenceUnit" transaction-type="RESOURCE_LOCAL">
    <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider>
    <class>com.example.MyEntity</class>
    <properties>
        <property name="javax.persistence.jdbc.driver" value="org.apache.derby.jdbc.EmbeddedDriver"/>
        <property name="javax.persistence.jdbc.url" value="jdbc:derby:memory:myDB;create=true"/>
        <property name="javax.persistence.jdbc.user" value="username"/>
        <property name="javax.persistence.jdbc.password" value="password"/>
    </properties>
</persistence-unit>

@Entity
@Table(name = "my_table")
public class MyEntity {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long id;

    // 其他属性和方法
}

EntityManagerFactory emf = Persistence.createEntityManagerFactory("myPersistenceUnit");
EntityManager em = emf.createEntityManager();

// 插入数据
em.getTransaction().begin();
MyEntity entity = new MyEntity();
// 设置实体属性
em.persist(entity);
em.getTransaction().commit();

// 查询数据
em.getTransaction().begin();
MyEntity result = em.find(MyEntity.class, 1L);
// 处理查询结果
em.getTransaction().commit();

em.close();
emf.close();