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Handling unknown enum values #807

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Merged
gcatanese merged 7 commits into main from handling-unknown-enums-2
Aug 14, 2025
Merged

Handling unknown enum values #807

gcatanese merged 7 commits into main from handling-unknown-enums-2
Aug 14, 2025

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@gcatanese gcatanese commented Aug 14, 2025

When an unknown enum value is found in the JSON payload (API response, webhook request) the deserialization throws an exception. This PR makes the deserialization logic more robust to be able to handle unknown enum values

The Mustache templates have been update to log a warning, instead of throwing an IllegalArgumentException.
Unit tests have been added to verify the deserialization code.
Several API models have been re-generated.

Implementation Details

When parsing a JSON payload and encountering unknown enumsm we have 2 options:

  1. strict validation throwing IllegalArgumentException if the value is unknown
  2. don't fail and ignore

We have adopted the latter as it allows us to be resilient when new enums appear in the API responses.

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Summary of Changes

Hello @gcatanese, I'm Gemini Code Assist1 ! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request significantly improves the resilience of the SDK's deserialization process by changing how unknown enum values are handled. Instead of throwing an exception and failing, the system will now log a warning, allowing for graceful degradation and continued operation when new enum values are introduced in API responses. This change was propagated across various API models through updated code generation templates.

Highlights

  • Improved Enum Deserialization Robustness: The primary change in this pull request is to enhance the robustness of enum deserialization. Previously, encountering an unknown enum value in a JSON payload would lead to an InvalidArgumentException, halting the process. This PR modifies the behavior to instead log a warning, allowing the application to continue processing data even if new enum values are introduced in API responses or webhooks.
  • Template-Driven Code Generation Update: The core logic change was implemented by updating the Mustache templates used for code generation. This ensures that all generated model files across various Adyen APIs (Balance Platform, Checkout, Legal Entity Management, Payments, and Transfers) inherit this new, more resilient enum handling behavior.
  • Extensive API Model Regeneration: Following the template updates, numerous API model files were re-generated. This broad impact across the codebase reflects a consistent application of the new enum deserialization strategy, ensuring uniform error handling for unknown enum values throughout the SDK.
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Code Review

This pull request aims to make the SDK more resilient to API changes by handling unknown enum values gracefully during deserialization. Instead of throwing an exception, it now logs a warning. This is a good approach for forward compatibility.

However, the current implementation has a critical issue: it logs the warning but still assigns the unknown value to the model's property. This puts the object into an invalid state, which can lead to unexpected behavior and bugs downstream. I've left a comment on the mustache template with a suggested fix to prevent setting the invalid value, which will resolve this issue across all generated models.

@gcatanese gcatanese merged commit 51550e5 into main Aug 14, 2025
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@gcatanese gcatanese deleted the handling-unknown-enums-2 branch August 14, 2025 08:37
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