PersistentList.getDeletes issue when used with @OneToMany and @IndexColumn -------------------------------------------------------------------------- Key: HHH-3158 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3158 Project: Hibernate3 Issue Type: Bug Affects Versions: 3.2.2 Reporter: Hao Chen I have the following scenario: class Parent { @OneToMany(cascade={CascadeType.ALL}) @IndexColumn(name="position", base=1) private List<Children> children; } And I am getting MySQL constraint error: com.mysql.jdbc.exceptions.MySQLIntegrityConstraintViolationException: Duplicate entry '332' for key 2 The reason for the exception is that Hibernate generated association table has: table parent_children: parent_id children_id unique --- this causes duplicate key error position I have tracked this down, and it looks like PersistentList.getDeletes is not returning the correct index to be deleted: suppose: oldChildren siize is 3 and the association table is: parent_id=1, children_id=1, position=1; parent_id=1, children_id=2, position=2; parent_id=1, children_id=3, position=3; now I delete the first child: because getDeletes only use size to decide which one in the list to be deleted, it will return {2} because it assumes the last item is deleted. so, the 3rd child is deleted from the association table. There is still two rows in the association table: parent_id=1, children_id=1, position=1; parent_id=1, children_id=2, position=2; now, because child 2 is at position 1 now, Hibernate try to update position=1 to: parent_id=1, children_id=2, but children_id already exists at row 2. Thus the MySQLIntegrityConstraintViolationException is throw. I think the PersistentList.getDeletes should do the same thing as PersistentBag.getDeletes, which compare each element in the list to the snapshot list to decide which elements to delete. -- This message is automatically generated by JIRA. - If you think it was sent incorrectly contact one of the administrators: http://opensource.atlassian.com/projects/hibernate/secure/Administrators.... - For more information on JIRA, see: http://www.atlassian.com/software/jira