hibernate annotation oracle nvarchar2 类型映射

[搜吃搜玩]

事情是这样的 在ORACLE 中 我建了一张表 SQL语句如下

create table Person(
       id number primary key not null,
       name nvarchar2(40) not null,
       age number not null
);
create sequence person_id;

hibernate.cfg.xml 配置如下:

<property name="hbm2ddl.auto">validate</property>

POJO代码如下:

public class Person {
	private int id;
	private String name;
	private int age;

	@Id
	@GeneratedValue(strategy=GenerationType.SEQUENCE,generator="personSEQ")
	public int getId() {
		return id;
	}
	public void setId(int id) {
		this.id = id;
	}

	public String getName() {
		return name;
	}
	public void setName(String name) {
		this.name = name;
	}
	public int getAge() {
		return age;
	}
	public void setAge(int age) {
		this.age = age;
	}

测试代码如下

public class test {
	public static void main(String[] args) {
		Person p = new Person();
		p.setName("xx3");
		p.setAge(14);

		Session session = new AnnotationConfiguration().configure().buildSessionFactory().getCurrentSession();
		session.getTransaction().begin();
		session.save(p);
		session.getTransaction().commit();
	}
}

运行报如下错误

Exception in thread "main" org.hibernate.HibernateException: Wrong column type in CH.PERSON for column name. Found: nvarchar2, expected: varchar2(255 char)
	at org.hibernate.mapping.Table.validateColumns(Table.java:284)
	at org.hibernate.cfg.Configuration.validateSchema(Configuration.java:1130)
	at org.hibernate.tool.hbm2ddl.SchemaValidator.validate(SchemaValidator.java:139)
	at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:359)
	at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1341)
	at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)
	at com.jxc.test.test.main(test.java:16)

经过测试我发现把建表语句 nvarchar2(40) 改成varchar2(40) 运行正常, 我知道在XML文件映射中 nvarchar2 类型是这样映射的

<property name="name">
	<column name="name" sql-type="nvarchar2(20)"></column>
</property>

我想问的是 在annotation 中如何映射 nvarchar2 类型的字段?
我已经在谷歌百度搜三四个小时了,依然没有答案,希望大家都来帮帮我这个诅丧的程序员吧!

[搜吃搜玩]

POJO 实体类 有

@Entity
@SequenceGenerator(name="personSEQ", sequenceName="person_id",allocationSize=1,initialValue=1)

刚刚没有复制全