Hi folks,

I am having trouble with cascading updates in a simple many-to-one relationship. I have an class called LanguageAbility with a one-to-many relationship with a class called Language. When I create a new LanguageAbility object, assign it a non-persisted Language object, then persist the LanguageAbility object, I would expect the Language object to be persisted also (with cascade="all"). However, when I try to do that, as shown in Test.java, I get the following error:



I don't understand what i am doing wrong. Thanks in advance for any help with this, and if I need to post more info please tell me.

Cheers,

James

Test.java
=========

public class Test
{
public static void main(String[] args)
{
try
{
Configuration cfg = new Configuration().configure();
SessionFactory sessions = cfg.buildSessionFactory();
Session sess = sessions.openSession();

Transaction tx = sess.beginTransaction();

Language l = new Language("Spanish", Language.WRITTEN);

LanguageAbility la = new LanguageAbility(l, 9);

sess.save(la);

sess.flush();

tx.commit();
}
catch(Exception e)
{
System.out.println(e);
}
}
}

LanguageAbility.hbm.xml
=======================

<hibernate-mapping>
<class name="LanguageAbility" table="languageability">
<id name="id">
<generator class="native"/>
</id>

<property name="ability" not-null="true"/>

<many-to-one name="language" column="language_id" not-null="true" cascade="all"/>
</class>
</hibernate-mapping>


Language.hbm.xml
================

<hibernate-mapping>
<class name="Language" table="languages">
<id name="id">
<generator class="native"/>
</id>

<property name="name">
<column name="name" sql-type="varchar(64)" not-null="true"/>
</property>

<property name="type">
<column name="type" not-null="true"/>
</property>
</class>
</hibernate-mapping>



Language.java
=============

public class Language
{
public static final int SPOKEN = 1;
public static final int WRITTEN = 2;

private String name;
private int id;
private int type;

public Language(){};

public Language(String name, int type)
{
this.name = name;
this.type = type;
}

public String getName()
{
return name;
}

public int getType()
{
return type;
}

public int getId()
{
return id;
}

public void setName(String name)
{
this.name = name;
}

public void setType(int type)
{
this.type = type;
}

public void setId(int id)
{
this.id = id;
}
}

LanguageAbility.java
====================

public class LanguageAbility
{
private Language language;
private int ability;
private int id;

public LanguageAbility(){};

public LanguageAbility(Language language, int ability)
{
this.language = language;
this.ability = ability;
}

public Language getLanguage()
{
return language;
}

public int getAbility()
{
return ability;
}


public int getId()
{
return id;
}

public void setLanguage(Language language)
{
this.language = language;
}

public void setAbility(int ability)
{
this.ability = ability;
}

public void setId(int id)
{
this.id = id;
}
}

This is a FAQ.


set unsaved-value="0"


re-read Parent/Child Relationship

I tried using unsaved-value="0".But it does not work.However it works using unsaved-value="any" in the id tag.