mysql lack of timestamps with milliseconds breaks hibernate when used with versioning ------------------------------------------------------------------------------------- Key: HHH-3822 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3822 Project: Hibernate Core Issue Type: Improvement Components: core Affects Versions: 3.3.1 Environment: mysql-5.1.32-1.fc10 Java(TM) SE Runtime Environment (build 1.6.0_12-b04) Reporter: Thomas Hartwig When I persist an instance with saveOrUpdate into a mysql dbms a version field is kept in milliseconds precision in the current application context. Unfortunately mysql truncates all the milliseconds from this field. So a following merge or any other version based operation fails until the object is refetched. Possible workarounds: - use an interceptor for truncating the version field - avoid using timestamp of mysql I know the milliseconds problem is really annoying by mysql and it is not a hibernate fault, but probably it can be avoided somehow or hibernate should throw an unsupported exception. Below is the sample setup: @Entity @Table(cname = "_Column") public class MappedColumn implements Serializable { private Date mtime; @Version public Date getMtime() { return mtime; } public void setMtime(Date mtime) { this.mtime = mtime; } [...] } CREATE TABLE `_Column` ( `name` varchar(255) collate latin1_german1_ci NOT NULL, `booleanColumn` bit(1) NOT NULL default '\0', `id` varchar(255) collate latin1_german1_ci NOT NULL default '', `ctime` datetime default NULL, `mtime` datetime default NULL, `columnOsc` varchar(255) collate latin1_german1_ci default NULL, `columnDbr` int(11) default NULL, PRIMARY KEY (`id`), UNIQUE KEY `name` (`name`) ) ENGINE=InnoDB DEFAULT CHARSET=latin1 COLLATE=latin1_german1_ci; -- 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