[android-developers] db4o SODA query giving result null on ordering descending

Hi all,
I have been using db4o in my project,i have to search result and
arrange in Descending order according to particular filed. I follow
below code, but am getting null value.

public List<Recipe> getRecipiesByString(String searchValue)
{
List<Recipe> list=null;
Query query=db().query();
query.constrain(Recipe.class);
Constraint constraint=
query.descend("_title").constrain(searchValue).contains();

query.descend("_description").constrain(searchValue).contains().or(constraint);

query.descend("_rating").orderDescending();

list= query.execute();
return list;
}
I have Class Recipe there, "_title" & "_description" are string fields
and "_rating" is double type field.

when i try to do in descending order with the fields "_rating", it has
been giving null value,
and after comment of this line
query.descend("_rating").orderDescending();
then value is coming properly.

what is solution to get result in Desceding order according to
"_rating".

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