NPE flushing reattached entity w/ non-mutable natural-id --------------------------------------------------------- Key: HHH-1149 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1149 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.1 rc2 Environment: Hibernate 3, rc2 HSQL 1.8 Reporter: Dennis C. Byrne Assignee: Steve Ebersole Fix For: 3.1 Attachments: HibernateTestCase.tar Attached are two test cases, the only difference is that the mutable attribute of a natural id is set to true for a single property of a single persistent class. See test output for a npe in DefaultFlushEntityEventListener.checkNaturalId . The natural id is not changed in either case. This is a simplified version of the problem I brought up on the forum http://forums.hibernate.org/viewtopic.php?t=949881&highlight=&sid...