[hibernate-issues] [Hibernate-JIRA] Created: (HHH-5954) WrongClassException in Single-Table Inheritance

WrongClassException in Single-Table Inheritance ----------------------------------------------- Key: HHH-5954 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-5954 Project: Hibernate Core Issue Type: Bug Components: core Affects Versions: 3.6.1 Environment: 3.6.1 Final, MySql 5 & HSQLDB 2 Reporter: Jeff Crowe A WrongClassException "loaded object was of wrong class" is randomly encountered in the following situation: Parent with single-table inheritance A B extends A C extends A Parent with single-table inheritance X Y extends X Z extends X B has field 'x' of type Y C has field 'x' of type X During initialization: * The AbstractEntityPersister for class A is loaded and createLoaders() is called * JoinWalker.walkEntityTree is invoked for class A * The persister.getSubclassPropertyType iteration will encounter both fields 'x' from B and C * If C.x is encountered first, then the base type X is walked and everything works without issues * If B.x is encountered first, then the subtype Y is walked. * When C.x is subsequently encountered, JoinWalker.isDuplicateAssociation will return true for the field and the base type X is not added as an association for A. * Later an attempt is made to query for C and a result C.x=Z is returned. A WrongClassException is thrown because Z != expected type Y This behavior is non-deterministic. The ordering that getSubclassPropertyType iterates is determined by hashtable values and are therefore pseudo-random. Known workaround: * Specify (targetEntity=X.class) on B.x * Alternately avoid duplicate field names on subtypes of a single-table entity hierarchy. -- 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