Hibernate version:2.1.7
[b]Mapping documents:

<hibernate-mapping package="mypkg">

<class name="Tempuser" table="TempUser" >
<id name="userid" column="userID" type="java.lang.String" unsaved-value="any">
<generator class="assigned" />
</id>

<property name="password" column="password"
type="java.lang.String" />

<joined-subclass name="mypkg.Tempexaminee"
table="TempExaminee" >
<key column="userid"></key>
<property name="firstname" column="firstName"></property>
</joined-subclass>



<joined-subclass name="mypkg.Tempadmin" table="TempAdmin" >
<key column="userID" ></key>

<property name="rights" column="rights" ></property>
</joined-subclass>

</class>

</hibernate-mapping>


[b]Code between sessionFactory.openSession() and session.close():
Transaction ts= HibernateSessionFactory.currentSession().beginTransaction();
String userid="chaxmax";
Tempuser te=(Tempuser) HibernateSessionFactory.currentSession().load(Tempuser.class, userid ) ;// ("from Tempuser t where t.userid=\'chaxmax\'").get(0);
te.setUserid("maxchax");
HibernateSessionFactory.currentSession().update(te);
ts.commit();
HibernateSessionFactory.closeSession();
System.out.println("successfully ");

[b]Full stack trace of any exception that occurs:

net.sf.hibernate.HibernateException: identifier of an instance of mypkg.Tempexaminee altered from chaxmax to maxchax
at net.sf.hibernate.impl.SessionImpl.checkId(SessionImpl.java:2662)
at net.sf.hibernate.impl.SessionImpl.flushEntity(SessionImpl.java:2485)
at net.sf.hibernate.impl.SessionImpl.flushEntities(SessionImpl.java:2478)
at net.sf.hibernate.impl.SessionImpl.flushEverything(SessionImpl.java:2280)
at net.sf.hibernate.impl.SessionImpl.flush(SessionImpl.java:2259)
at net.sf.hibernate.transaction.JDBCTransaction.commit(JDBCTransaction.java:61)
at myclient.MyClient.main(MyClient.java:41)
Exception in thread "main"

Name and version of the database you are using:sql server

Plz help me out that how can i cascade update.

Plz if any one know this help me out . i got stuck in my project