Don't Forget To Flush

So, instead of being asleep like an honest citizen at 2 o'clock in the morning, here I am trying to make hibernate save my collection of Strings.

(I would hate not to be a developer: who else deals with Collections of Strings, I wonder?)

The mapping is perfect, straight from the documentation, to tricky stuff, no funny cases:

    <set name="categories" table="resources_categories">
      <key column="resource"/>
      <element column="category" type="string"/>
    </set>

Except, when I populate my category list, and try getSession().save(newResource) ... it doesn't save my Strings!

After a little more googling than I would have hoped, I bumped into this - http://forum.hibernate.org/viewtopic.php?t=951848&blah blah... where the hibernate team says you have to flush in this case. You don't have to flush to save most other things, but if it's a Collection of Strings, you have to flush.

So this works:

    getSession().save(newResource);
    getSession().flush();

- no changes to the mapping required.