hibernate中一对一param named "property" is required for foreign id generation strategy错误

两个类Person、IdCard

Person：主键id

private Integer id;private String name;private IdCard idCard;

IdCard：主键id 外键id （此处的id即为Person里面的id）

private Integer id;private Person person;private Date usefulLife;

出现错误：

org.hibernate.MappingException: could not instantiate id generator [entity-name=cn.itcast.hibernate.domain.IdCard]
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:109)
at org.hibernate.mapping.SimpleValue.createIdentifierGenerator(SimpleValue.java:152)
at org.hibernate.impl.SessionFactoryImpl.<init>(SessionFactoryImpl.java:197)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1313)
at cn.itcast.hibernate.HibernateSessionFactory.<clinit>(HibernateSessionFactory.java:31)
at cn.itcast.hibernate.One2One.add(One2One.java:25)
at cn.itcast.hibernate.One2One.main(One2One.java:18)
Caused by: org.hibernate.MappingException: param named "property" is required for foreign id generation strategy
at org.hibernate.id.ForeignGenerator.configure(ForeignGenerator.java:82)
at org.hibernate.id.IdentifierGeneratorFactory.create(IdentifierGeneratorFactory.java:104)
... 6 more
%%%% Error Creating SessionFactory %%%%
org.hibernate.InvalidMappingException: Could not parse mapping document from resource cn/itcast/hibernate/domain/Person.hbm.xml

解决方法：

myeclipse10自动生成IdCard.hbm.xml文件内容如下

<hibernate-mapping>    <class name="cn.itcast.hibernate.domain.IdCard" table="id_card" catalog="test">        <id name="id" type="java.lang.Integer">          <column name="id" />          <generator class="foreign"></generator>        </id>        <one-to-one name="person" class="cn.itcast.hibernate.domain.Person" constrained="true"></one-to-one>        <property name="usefulLife" type="java.util.Date">            <column name="useful_life" length="10" not-null="true" />        </property>    </class></hibernate-mapping>

应该改为：

<id name="id" type="java.lang.Integer">          <generator class="foreign">          <param name="property">person</param>        </generator>        </id>