Prevent NPE when 1:n relationships contains null elements. #782
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michael-simons
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Mar 25, 2020
This introduces an `InvalidRelationshipTargetException` which is thrown when a user tries to persist a domain object holding a 1:n reference in a collection containing one or more `null` elements. This prevents a `NullpointerException` and fixes #781. The change also reduces the number of branches in `EntityGraphMapper#mapEntityReferences` as we can reuse an `iterableOf` helper introduced for the `SingleUseEntityMapper`. Making this helper available as a utils method, we could also remove similar usage in other areas as a side effect.
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This fixes #781.