IncrediblySillyJpaMapsIdMappedIdentifierValueMarshaller attempts to persist detached entities that are part of a composite Primary key for another entity --------------------------------------------------------------------------------------------------------------------------------------------------------- Key: HHH-6305 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-6305 Project: Hibernate Core Issue Type: Bug Components: core, entity-manager Affects Versions: 3.6.5 Reporter: Paul Nardone Attachments: test.zip I have an entity (BookVersion) with a composite ID consisting of many-to-one links to other entities in the system (BookID,Library). The (BookVersion) entity has an IdClass (BookVersionPK) which maps these to Long values. When I call merge on a detached instance of the entity (BookVersion) IncrediblySillyJpaMapsIdMappedIdentifierValueMarshaller attempts to find the ID entities (BookID,Library) in the current context these fail which results in "Performing implicit derived identity cascade" which attempts to persist the detached ID entities (BookID,Library) -- 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