Comparators, defined for collections in mapping files, are not set ------------------------------------------------------------------ Key: HHH-1133 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1133 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.1 rc2 Reporter: Richard HALLIER Assignee: Steve Ebersole Fix For: 3.1 Example : <set name="items" inverse="true" sort="com.ItemComparator"> <key column="x_id"/> <one-to-many class="com.Item"/> </set> Hibernate doesn't initialize correctly the sorted set, the comparator is not set. I think it comes from the following method of the Collection class : public Comparator getComparator() { if(comparator!=null && comparatorClassName!=null) { try { setComparator( (Comparator) ReflectHelper.classForName( comparatorClassName ).newInstance() ); } catch (Exception e) { throw new MappingException( "Could not instantiate comparator class: " + comparatorClassName + " for collection " + getRole() ); } } return comparator; } It obviously should be : if(comparator==null && comparatorClassName!=null) { Richard.