Exception while saving when using a set and an association to the same target class ----------------------------------------------------------------------------------- Key: HHH-4937 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-4937 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.3.1 Environment: Linux Sun JDK 1.6 Reporter: Jean-Noel Rivasseau Priority: Critical Attachments: list-association.zip The attached files reproduce the problem. As you will see in the source files there are different variations: if you turn off the cascade on the association, it will work. The exception is: Exception in thread "main" org.hibernate.PropertyValueException: not-null property references a null or transient value: Computer._computersBackref -- 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