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fix null pointer exception on review sync #345

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@iam-flo iam-flo commented May 28, 2025

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Summary by CodeRabbit

  • Bug Fixes
    • Improved error handling when linking the author of a pull request review to prevent issues caused by missing or inaccessible user data.

@iam-flo iam-flo self-assigned this May 28, 2025
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coderabbitai bot commented May 28, 2025

Walkthrough

The exception handling in the processPullRequestReview method was updated to also catch NullPointerException in addition to IOException when linking the author of a pull request review. The error logging remains consistent for both exceptions.

Changes

File Path Change Summary
.../pullrequestreview/github/GitHubPullRequestReviewSyncService.java Expanded exception handling to catch NullPointerException.

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In the code where pull requests flow,
More careful now, exceptions we know!
Nulls and IO, both caught with care,
No more surprises lurking there.
The log will tell us what went wrong—
A safer hop, where errors belong! 🐇✨

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@github-actions github-actions bot added bug Something isn't working application-server size:XS This PR changes 0-9 lines, ignoring generated files. labels May 28, 2025
@iam-flo iam-flo marked this pull request as ready for review May 28, 2025 13:33
@Copilot Copilot AI review requested due to automatic review settings May 28, 2025 13:33
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Pull Request Overview

This PR addresses a null pointer exception encountered during pull request review synchronization by expanding the exception handling.

  • Expands the catch block to include NullPointerException.
  • Updates the error handling logic in the GitHubPullRequestReviewSyncService.

@@ -98,7 +98,7 @@ public PullRequestReview processPullRequestReview(GHPullRequestReview ghPullRequ
.findById(user.getId())
.orElseGet(() -> userRepository.save(userConverter.convert(user)));
result.setAuthor(resultAuthor);
} catch (IOException e) {
} catch (NullPointerException | IOException e) {
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Catching NullPointerException can obscure underlying issues; consider adding explicit null checks where necessary to handle the cause of the exception instead of using a catch-all approach.

Copilot uses AI. Check for mistakes.

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Actionable comments posted: 0

🧹 Nitpick comments (1)
server/application-server/src/main/java/de/tum/in/www1/hephaestus/gitprovider/pullrequestreview/github/GitHubPullRequestReviewSyncService.java (1)

101-101: Good fix for the null pointer exception issue.

The addition of NullPointerException to the catch block appropriately handles the case where ghPullRequestReview.getUser() returns null, preventing the uncaught exception that would occur on line 98 when calling user.getId(). This maintains the same error logging behavior for both I/O errors and null user scenarios.

Consider an alternative approach with explicit null checking for better readability:

// Link author
try {
    GHUser user = ghPullRequestReview.getUser();
+   if (user == null) {
+       logger.error("Failed to link author for pull request review {}: User is null", ghPullRequestReview.getId());
+       return pullRequestReviewRepository.save(result);
+   }
    var resultAuthor = userRepository
        .findById(user.getId())
        .orElseGet(() -> userRepository.save(userConverter.convert(user)));
    result.setAuthor(resultAuthor);
-} catch (NullPointerException | IOException e) {
+} catch (IOException e) {
    logger.error(
        "Failed to link author for pull request review {}: {}",
        ghPullRequestReview.getId(),
        e.getMessage()
    );
}

This approach provides clearer separation between null handling and I/O error handling, though the current solution is perfectly acceptable.

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📥 Commits

Reviewing files that changed from the base of the PR and between debe53b and 757db9b.

📒 Files selected for processing (1)
  • server/application-server/src/main/java/de/tum/in/www1/hephaestus/gitprovider/pullrequestreview/github/GitHubPullRequestReviewSyncService.java (1 hunks)

@FelixTJDietrich
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@iam-flo is this a PR that should me merged? Or was this just for testing? In that case we should close it.

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