Add JsonNullable schema support - #3340
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Co-Authored-By: Codex GPT-5 <noreply@openai.com>
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Sep 6, 2026
JsonNullable<T> now renders as the wrapped value, nullable unless a non-null constraint applies, and no longer becomes required merely because such a constraint is present - the wrapper exists precisely to tell an omitted property apart from an explicit null. The converter is registered only when jackson-databind-nullable is on the classpath. Backport of PR #3340. jspecify is not on this line's test classpath, so the fixture declares its own TYPE_USE @nullable; nullability is matched by simple name, so the behaviour under test is unchanged. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
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Adds support for
jackson-databind-nullablewhen the library is present.JsonNullable<T>is represented as its wrapped value rather than its Java wrapper properties.Unlike normal SpringDoc inference, non-null constraints on
JsonNullable<T>do not make the property required. This is intentional: JsonNullable is purpose-built to distinguish an omitted property from an explicitly supplied null.Permits omission, null or a string. Both declarations below permit omission but exclude null:
The second form relies on JsonNullable’s default validation unwrapping. Explicit required declarations, such as
@Schema(requiredMode = REQUIRED), remain respected.Schema resolution and annotation handling are delegated to Swagger Core. Regression fixtures cover OpenAPI 3.0 and 3.1.
Related: #2512