I have class "X" which contain List of "Y" objects
e.g

class X
{
List listOfY;
Sting name;
int id;
}

class Y{
String name;
int id;
int StartMonth;
int EndMonth;
int order;
X parentX;
}


and hibernate mapping like this
<class name ="X" table="TIME_X">
..........
......
....
<list name="listOfY" cascade="all" lazy="false" inverse="true" >
<key column="X_ID" />
<list-index column="Y_ORDER" base= "1"/>
<one-to-many class="Y"/>
</list>
.....
......
</class>

<class name = "Y" table ="TIME_Y">
-----
---
<many-to-one
name="parentX"
column="X_ID"
class="X"
/>
---
-----
</class>


I want to use list. Because I want hibernate to manipulate order. But we also have a bi-directional relationship between Class X and Class Y with inverse=true on indexed collection side. and also don’t want to map Y_ORDER column with order property of class Y.

with inverse = false, Hibernate is saving all the index values properly.

but for inverse = true
1) if there is mapping for Y_ORDER column with order property.
and order is not set then Hibernate saves "0" for Y_Order column

2) If there is no mapping for Y_ORDER with Order property

Hibernate inserts Null values for Y_ORDER column

Does anybody have a solution to this problem? I'm facing the same thing...

Alright, the workaround is here:

http://forum.hibernate.org/viewtopic.ph ... ndex+saved

This really seems to be a bug.
Hibernate reference documentation recomends inverse="true" on bags and lists for better performance :

"19.5.3. Bags and lists are the most efficient inverse collections
...there is a particular case in which bags (and also lists) are much more performant
than sets. For a collection with inverse="true" (the standard bidirectional one-to-many relationship
idiom, for example) we can add elements to a bag or list without needing to initialize (fetch) the bag elements!"

I have tested this sceneraio with versions from 3.0.5 to 3.1.1.
So far, a one-to-many list is not able to save the index value when inverse="true"

Please refer to this
http://opensource2.atlassian.com/projec ... owse/HB-79
http://hibernate.org/116.html#A12