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MapStruct vs Immuto: How Each Java Mapper Handles Records Differently

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A technical comparison highlights specific friction points where MapStruct, the dominant Java compile-time mapper, struggles with Java Records in edge cases. While MapStruct has supported Records since version 1.4.0 via canonical constructor calls, it silently injects null values when it cannot invert asymmetric mappings, with no compile-time error or warning. Its default policy for unmapped target fields is also a warning rather than a build failure, meaning broken mappings can slip through to runtime unnoticed. Immuto, a newer mapper built around Records from the ground up, treats both scenarios as compile-time errors by default, forcing developers to handle gaps explicitly. The comparison concludes that the difference is less about capability and more about default behavior and how each tool surfaces mapping failures.

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