Non lazy loaded List updates done in wrong order, cause exception ----------------------------------------------------------------- Key: HHH-1296 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1296 Project: Hibernate3 Issue Type: Bug Components: core Affects Versions: 3.0.5 Environment: Hibernate 3.0.5 - any database (checked postgres 7/8, mysql 4 & 5, db2 v8) NOT using lazy loading - the tx's are wrapped by session beans, so lazy loading is not allowed. Reporter: David Birch Priority: Critical Attachments: listupdate_patch.txt, listupdate_patch.txt, listupdate_testcase.zip The logic behind list updates is not quite right, nor was it in v2 (only now i have a DBA who won't let up...) The scenario is: a bean with list property, and the list has a number of items in it (say 4, index 0-3), an item is then removed (say item at index 2), and the bean is requested to be saved. From what i can see in the SQL traces, the same statements are issues whe lazy loading is on or off, they are: [18/12/05 19:48:50:766 EST] 00000036 SystemOut O Hibernate: delete from TGE_CLIENT_POLICY where CLIENT_ID=? and POSITION=? [18/12/05 19:48:50:766 EST] 00000036 SystemOut O Hibernate: update TGE_CLIENT_POLICY set POLICY_NK=? where CLIENT_ID=? and POSITION=? So, i can only assume (as when this fails, the row with index 1 above the removed row is nuked!), hibernate removes the item at index 3, and then copies the value of the item at index 3 onto the row for item at index 2. Fair enough but... When i have lazy loading off, i get DB exceptions like Duplicate key or integrity constraint violation message from server: "Duplicate entry '1-999999' for key 1" so, there is some nasty in there, which is not updating the correct row - this has happened since 2.1.8 that i know of :( i will try & look @ the source, but won't get a chance until after xmas...