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Fix input cycle validation for non-null lists by andimarek · Pull Request #4386 · graphql-java/graphql-java · GitHub

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Fix input cycle validation for non-null lists - #4386

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andimarek merged 1 commit into
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fix-4214-input-list-cycle
May 20, 2026
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Fix input cycle validation for non-null lists#4386
andimarek merged 1 commit into
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fix-4214-input-list-cycle

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andimarek commented May 19, 2026

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Summary

Verification

  • Confirmed the new regression test fails on current master with: [self!] forms an unsatisfiable cycle
  • ./gradlew test --tests graphql.schema.validation.NoUnbrokenInputCyclesTest
  • ./gradlew test --tests 'graphql.schema.validation.*'

Fixes #4214

andimarek mentioned this pull request May 19, 2026
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github-actions Bot commented May 19, 2026 •
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Test Report

Test Results

Java Version Total Passed Failed Errors Skipped
Java 11 5828 (+2 🟢) 5772 (+2 🟢) 0 (±0) 0 (±0) 56 (±0)
Java 17 5828 (+2 🟢) 5771 (+2 🟢) 0 (±0) 0 (±0) 57 (±0)
Java 21 5828 (+2 🟢) 5771 (+2 🟢) 0 (±0) 0 (±0) 57 (±0)
Java 25 5828 (+2 🟢) 5771 (+2 🟢) 0 (±0) 0 (±0) 57 (±0)
jcstress 32 (±0) 32 (±0) 0 (±0) 0 (±0) 0 (±0)
Total 23344 (+8 🟢) 23117 (+8 🟢) 0 (±0) 0 (±0) 227 (±0)

Code Coverage (Java 25)

Metric Covered Missed Coverage vs Master
Lines 29551 3130 90.4% ±0.0%
Branches 8669 1533 85.0% ±0.0%
Methods 7892 1210 86.7% ±0.0%

Changed Class Coverage (1 class)

Class Line Branch Method
g.s.v.NoUnbrokenInputCycles +2.6% 🟢 +4.4% 🟢 ±0.0%

Full HTML report: build artifact jacoco-html-report

Updated: 2026-05-20 00:55:07 UTC

andimarek commented May 20, 2026

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Double-checked against the current GraphQL draft spec. Example 83 is exactly the case covered by this PR:

input Example { self: [Example!]! value: String }

The spec says this circular reference is valid because self may be an empty list, and the Input Object type validation rule says a recursive chain is valid when at least one field in the chain is nullable or a List type.

Spec reference: https://spec.graphql.org/draft/#sec-Input-Objects.Circular-References

andimarek force-pushed the fix-4214-input-list-cycle branch from b748fb8 to 63cdef1 Compare May 20, 2026 00:31
andimarek enabled auto-merge (squash) May 20, 2026 00:34
andimarek merged commit 7e0b1c1 into master May 20, 2026
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andimarek mentioned this pull request Aug 20, 2026
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Schema generator reports false positive unsatisfiable input object cycle

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