[hibernate-issues] [Hibernate-JIRA] Commented: (HHH-1621) subclass mapping by discriminator - should instantiate parent for unmapped discriminator values

subclass mapping by discriminator - should instantiate parent for unmapped discriminator values ----------------------------------------------------------------------------------------------- Key: HHH-1621 URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-1621 Project: Hibernate3 Type: Improvement

Components: core Environment: 3.1.2 Sybase ASE 12.5.3 Reporter: Martin Schulz Attachments: HHH-1621 Scenario: The parent class A has a discriminator field and some but all possible scriminator values are mapped to subclasses. Current behavior: 1) Default: The following exception is thrown org.hibernate.WrongClassException: Object with id: 10000 was not of the specified subclass: A (Discriminator: D) at org.hibernate.loader.Loader.getInstanceClass(Loader.java:1445) [ the error itself is also quite misleading, as the row is exactly of / for the specified class A. But there simply was no subclass found ]. 2) discriminator with force="true" The parent class is never instantiated, only the mapped subclasses are instantiated. Proposed behavior: The parent class should be instantiated for those rows with unmapped discriminator values. Characteristics of proposed behavior: - all rows in resultset would lead to instantiated class in the inheritence tree, - the behavior would be in line with how joined-subclass behaves - no caveat documentation required Implementation: (Easy) in Loader.java, lines 1443ff, do not throw WrongClassException, but instead return persister.getEntityName(); (Alternate) change persister.getSubclassForDiscriminatorValue() implementations correspondingly. Thx for your consideration / vote.