Merging lazy bidirectional one-to-one association with CascadeType.MERGE from both sides does not work correctly. ----------------------------------------------------------------------------------------------------------------- Key: HHH-3714 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-3714 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.3.1 Environment: Hibernate Core 3.3.1.GA Hibernate Annotations 3.4.0 GA Hibernate EntityManager 3.4.0 GA Hibernate Validator 3.1.0 GA Reporter: Tihomir Totev Attachments: merge_bug.zip If you merge in the session object that has mappedBy annotation it works fine, but when you merge the other object it is inserted twice in the database. Then "More than one row with the given identifier was found" is given, which is correct since it is really inserted twice. I'm attaching a test of this problem. This test was working fine with core 3.2.6.ga. -- 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