Hi all,

I try to use hibernate in a project and i just get into trouble.
To be simple, i've got 2 type of Java Object: Network and Line

Here is their java code (generated by Castor from XSD document):

public class PtNetwork
{
private java.lang.String _objectId; // Id
private java.lang.String _name;
.... whith all the getter and setter
}

public class Line
{
private java.lang.String _objectId;
private java.lang.String _name;
private java.lang.String _number;
.... whith all the getter and setter

private java.lang.String _ptNetworkIdShortcut;

public void setPtNetworkIdShortcut(java.lang.String ptNetworkIdShortcut)
{
this._ptNetworkIdShortcut = ptNetworkIdShortcut;
}
}

As you can see a Line know her network, or to be exact, a line knows the id of her network. That's where the problem begin.

Mapping documents:
My mapping is like this:

#for the Network
<hibernate-mapping>
<class
name="com.chouette.PtNetwork"
table="PtNetwork"
dynamic-update="false"
dynamic-insert="false"
>

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


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

</class>

</hibernate-mapping>

#for the Line
<hibernate-mapping>
<class
name="com.chouette.Line"
table="Line"
dynamic-update="false"
dynamic-insert="false"
>
<id
name="objectId"
column="objectId"
type="java.lang.String"
>
<generator class="assigned">
</generator>
</id>
<property
name="name"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="name"
/>
<property
name="number"
type="java.lang.String"
update="true"
insert="true"
access="property"
column="number"
/>
<many-to-one
name="ptNetworkIdShortcut"
class="com.chouette.PtNetwork"
cascade="none"
outer-join="auto"
column="ptNetworkIdShortcut"
/>
</class>
</hibernate-mapping>


When i try to save my line like this:

#create a network
PtNetworkn= new PtNetwork();
n.setObjectId("Network1");

#create a line
Line l=new Line();
l.setName("Line1");

#affect network id to the line
l.setPtNetworkIdShortcut(n.getObjectId());

#save the network
s.save(pn);

#save the line
s.save(l)

I,ve got this exception :
Exception in thread "main" net.sf.hibernate.MappingException: No persister for: java.lang.String
at net.sf.hibernate.impl.SessionFactoryImpl.getPersister(SessionFactoryImpl.java:344)
at net.sf.hibernate.impl.SessionImpl.getClassPersister(SessionImpl.java:2686)
at net.sf.hibernate.impl.SessionImpl.getPersister(SessionImpl.java:2693)
at net.sf.hibernate.impl.SessionImpl.isUnsaved(SessionImpl.java:1090)
at net.sf.hibernate.impl.SessionImpl.nullifyTransientReferences(SessionImpl.java:1036)
at net.sf.hibernate.impl.SessionImpl.nullifyTransientReferences(SessionImpl.java:1022)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:927)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:857)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:779)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:738)
at testtransaction.main(testtransaction.java:186)



what must be many-to-one mapping logics ?
I read somewhere that it is had be simplier if the network reference of my line was an object like this

class Line
{
....

private PtNetwork _ptNetworkShortcut;
public void setPtNetworkIdShortcut(PtNetwork ptNetwork)
{
this._ptNetworkShortcut = ptNetwork;
}

....
}

but my code is generated by castor from an XSD document i can't change.

Anyone knows the goog way to create this simple association is welcome.

Thanks

PS : I use hibernate2 (downloaded a month ago) with postgreSQL 734
PS2 : let me knows if my mail isn't clear...