HHH-18764 Fix incorrect type resolution in ManyToOneType dirty check #9172
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This pull request addresses a bug in the
isDirtymethod when dealing with ManyToOne associations that are referenced by a unique key instead of a primary key, particularly when the primary key is a custom type.This bug stems from a mismatch in how
isDirtychecks for changes: while it correctly retrieves the unique key value usinggetIdentifier, it incorrectly relies ongetIdentifierType, which only considers the primary key type. This results in unexpected behavior—in this case, aClassCastExceptionwhen attempting to call the custom ID type's equals method.The fix replaces
getIdentifierTypewithgetIdentifierOrUniqueKeyType, ensuring thatisDirtycorrectly accounts for both primary keys and unique keys. This issue is demonstrated in the unit testManyToOneUniqueKeyReferenceWithCustomIdTest.By submitting this pull request, I confirm that my contribution is made under the terms of the Apache 2.0 license
and can be relicensed under the terms of the LGPL v2.1 license in the future at the maintainers' discretion.
For more information on licensing, please check here.
https://hibernate.atlassian.net/browse/HHH-18764