I have a class A which contains a messages field. This is a Set of Strings.
So on the getMessages() method I have the following javadoc...

* @hibernate.set role="messages"
* @hibernate.collection-key column="foreignkeyid"
* @hibernate.collection-element column="message" type="string"

When I attempt to load my mappings I get the following error...

[junit] (cfg.Configuration 289 ) Could not configure datastore from input stream
[junit] java.lang.NullPointerException
[junit] at net.sf.hibernate.util.StringHelper.qualify(StringHelper.java:241)
[junit] at net.sf.hibernate.cfg.Binder.bindCollection(Binder.java:472)
[junit] at net.sf.hibernate.cfg.Binder$2.create(Binder.java:1382)
[junit] at net.sf.hibernate.cfg.Binder.propertiesFromXML(Binder.java:989)
[junit] at net.sf.hibernate.cfg.Binder.bindRootClass(Binder.java:344)
[junit] at net.sf.hibernate.cfg.Binder.bindRoot(Binder.java:1204)
[junit] at net.sf.hibernate.cfg.Configuration.add(Configuration.java:247)
[junit] at net.sf.hibernate.cfg.Configuration.addInputStream(Configuration.java:28
1)

I guess that Im unsure how to configure a simple String onetomany using xdoclet.

Ta,
Stuart.

How does the generated mapping look like? Does it work without the set?

Yes it does work without the set
The mapping file looks like...

<set
role="messages"
lazy="false"
readonly="false"
cascade="none"
sort="unsorted"
>

<key
column="aid"
/>

<element
column="message"
type="string"
not-null="false"
unique="false"
/>

</set>

Im not a big hibernate expert so I cant usually spot dodgy mapping files.
Thanks for the help.

Does hibernate know to automatically create a collection table for my Set of Strings when it sees a set mapping?

There is no "role" attribute anymore in the <set> element, at least not in recent versions of Hibernate. It is now called "name" ... try leaving the role setting out of @hibernate.set

The xdoclet is now...

/** The getter method for this events messages
*
* @hibernate.set
* @hibernate.collection-key column="electioneventid"
* @hibernate.collection-element column="message" type="string"
*/


But still the same error.

And the mapping file is...

<set
role="messages"
lazy="false"
readonly="false"
cascade="none"
sort="unsorted"
>

<key
column="electioneventid"
/>

<element
column="message"
type="string"
not-null="false"
unique="false"
/>

</set>


I can still see the role.
Do I need to change this to name?

Are you using an up to date xdoclet version?

That could be the issue.
Im currently using xdoclet-hibernate-module-1.2.jar

Ill see if there is a later one.

I am using xdoclet-hibernate-module-1.2b4 here and it generates "name" attributes. Have you set <hibernate version="2.0"/> in your hibernatedoclet ant task?

I did not have...

version="2.0"

In my ant task. :-(
Im now onto a finding database dificulty and that is good because I have not started the database yet.
Big apologies for taking your time and thanks for all the help.

Ta,
Stuart.

No problem :)