[wozhenbang2004]

POJO-shaped Map.Entry deserialization does not resolve type deserializers for its key or value. Valid JSON with @JsonTypeInfo therefore fails for abstract contents, although the natural entry shape handles the same polymorphic value. The POJO copy constructor also has its key/value TypeDeserializer parameters reversed.

Resolve both type handlers using the same existing-handler/configuration lookup as the natural path, and keep their positions consistent when copying the deserializer.

Five regressions cover polymorphic keys, values, both sides, property-level POJO shape and a natural-shape control. Four POJO cases fail on unchanged production code; the control passes. After the fix the full fork workflow passes on Java 17 (Ubuntu and Windows), 21 and 25: 7,617 tests, no failures or errors.

Regression control: https://github.com/wozhenbang2004/jackson-databind/actions/runs/41315899589
Passing build: https://github.com/wozhenbang2004/jackson-databind/actions/runs/41316319761

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Branches	77.15%	📈 +0.060%

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[gitar-bot]

Code Review ✅ Approved

🟡 Medium risk · Retaining key and value type handlers for POJO-shaped Map.Entry changes polymorphic deserialization, which could instantiate unintended subtypes from input.

Retains polymorphic key and value type handlers for POJO-shaped Map.Entry deserialization, so @JsonTypeInfo contents now resolve the same way as the natural entry shape. The POJO copy constructor's key/value TypeDeserializer parameters are also corrected. No issues found.

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[github-actions]

🧪 Code Coverage Report

Metric	Coverage	Change
Instructions	83.05%	📈 +0.040%
Branches	77.16%	📈 +0.050%

Coverage data generated from JaCoCo test results

[github-actions]

🧪 Code Coverage Report

Metric	Coverage	Change
Instructions	83.06%	📈 +0.050%
Branches	77.22%	📈 +0.110%

Coverage data generated from JaCoCo test results