Today I noticed that the items mapped in Category.hbm.xml are ordered by a DISPLAY_POSITION.


When I look in Item.hbm.xml I see no display position property, so it only resists in the database table. But how is this DISPLAY_POSITION being updated?

When I add a new Item is this DISPLAY_POSITION Column then auto incremented?

Is there also a possiblity to use the startDate as the index?
Like this:

<list name="items" table="CATEGORY_ITEM">
<key column="CATEGORY_ID" />
<list-index column="START_DATE"/>

It's the index of a java.util.List.



Well, yes.



java.util.List has a numeric index, what you are looking for is called java.util.Map.