How to get unsaved-value="undefined" in the mapping file?I am using XDoclet and ant to generate mapping file.
I am getting StaleObjectStateException when trying to update a row.
Even tho when I provide tag
@hibernate.timestamp unsaved-value="undefined", this is not being generated in the mapping file, because of which I am getting Staleobject Exception.



Hibernate version:2.1.2

Mapping documents:

<?xml version="1.0"?>

<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">

<hibernate-mapping>
<class
name="com.systec.lifetec.labs.valueobjects.ResultCodeVO"
table="tbl_test_result_code"
dynamic-update="false"
dynamic-insert="false"
>

<id
name="resultCode"
column="result_code"
type="java.lang.String"
>
<generator class="assigned">
</generator>
</id>

<timestamp
name="updateDateTime"
column="updt_datetime"
/>

<property
name="description"
type="java.lang.String"
update="true"
insert="true"
column="description"
/>

<property
name="active"
type="boolean"
update="true"
insert="true"
column="active"
/>

<property
name="showInLegend"
type="boolean"
update="true"
insert="true"
column="show_in_legend"
/>

<property
name="userID"
type="java.lang.String"
update="true"
insert="true"
column="updt_userid"
not-null="true"
/>

<!--
To add non XDoclet property mappings, create a file named
hibernate-properties-ResultCodeVO.xml
containing the additional properties and place it in your merge dir.
-->

</class>

</hibernate-mapping>



Code between sessionFactory.openSession() and session.close():

Session ss=openSession();
Transaction tr=ss.beginTransaction();
ss.update(resultCodeVO);
tr.commit();
ss.close();




Full stack trace of any exception that occurs:

Name and version of the database you are using:SQLServer 2000

Debug level Hibernate log excerpt:

unsaved-value=null works for me.