[hibernate-issues] [Hibernate-JIRA] Resolved: (HHH-2503) AbstractEntityPersister swallows JDBCExceptions in processGeneratedProperties

AbstractEntityPersister swallows JDBCExceptions in processGeneratedProperties ----------------------------------------------------------------------------- Key: HHH-2503 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2503 Project: Hibernate3 Issue Type: Bug Components: core Affects Versions: 3.2.1, 3.2.2, 3.2.3 Environment: 3.2.2GA and trunk Reporter: Dag Liodden Assignee: Gail Badner Fix For: 3.2.6, 3.3 Seems to be a small typo on line 3718 in AbstractEntityPersister (trunk and 3.2.2 GA) which makes exceptions during property generation being logged but not thrown: catch( SQLException sqle ) { JDBCExceptionHelper.convert( getFactory().getSQLExceptionConverter(), sqle, "unable to select generated column values", selectionSQL ); There should be a throw in there I guess. :) catch( SQLException sqle ) { throw JDBCExceptionHelper.convert( getFactory().getSQLExceptionConverter(), sqle, "unable to select generated column values", selectionSQL ); This bug will not be noticeable in most cases and is probably why it hasn't been detected / fixed so far. The method in question (processGeneratedProperties) is used for retrieving properties that are marked as "generated" in the mapping document / annotations - in other words any value that the database provides and is considered "read-only" from the Hibernate application's point of view. The generated value is retrieved by an extra select statement executed by Hibernate after an entity has been inserterd and / or updated (according to how the generated property is flagged). In my particular case, a property (not a key) is marked as generated="insert", so after Hibernate inserts a new entity to the database, it will immediately do a select and set the generated property to the value the database returns. Only in rare cases will this select fail in any way - in fact, I cannot think of any situations other than mapping errors (e.g getInt on a CHAR column) that can cause errors in this last select. That is in addition to my situation - a deadlock. My entity class uses uuid.hex generator for the PK, but at one point, we introduced a second unique key due to purely aestethic reasons. This is a SQL Server identity column. Since we don't do any explicit table locking during the inserts, we end up with deadlocks every time the following happens: T1: INSERT INTO TABLE (ID) values (?) T2: INSERT INTO TABLE (ID) values (?) T2: SELECT GENERATED_ID FROM TABLE WHERE ID = ? -- T1's insert hasn't been committed, so what should the the generated ID be? Deadlock! T1: SELECT GENERATED_ID FROM TABLE WHERE ID = ? ... SQL Server throws an error to indicate the deadlock, but due to the missing throw in the processGeneratedProperties-method, it is never shown to the process doing the insert. The generated property is not set and retains it's null (or 0 in case of a primitive) without the business logic ever knowing that the entity could not be saved.