Stackoverflow error with cyclic references involving allOf

Given this schema definition

openapi: 3.0.1
info:
  title: recursive test
  version: '1.0'
servers:
  - url: 'http://localhost:8000/'
paths:
  /ping:
    get:
      operationId: ping
      responses:
        '200':
          description: OK
          content:
            text/plain:
              schema:
                $ref: '#/components/schemas/B'
components:
  schemas:
    B:
      type: object
      properties:
        message:
          type: string
        message2:
          type: string
        details:
          type: array
          items:
            allOf:
              - $ref: '#/components/schemas/B'

and running openapi-diff spec.yaml spec.yaml I get stack overflow error

Exception in thread "main" java.lang.StackOverflowError
        at java.base/java.util.Arrays.spliterator(Arrays.java:5482)
        at java.base/java.util.Arrays.stream(Arrays.java:5633)
        at java.base/java.util.Arrays.stream(Arrays.java:5614)
        at java.base/java.util.stream.Stream.of(Stream.java:1188)
        at com.qdesrame.openapi.diff.model.ChangedExtensions.getChangedElements(ChangedExtensions.java:37)
        at com.qdesrame.openapi.diff.model.ComposedChanged.isChanged(ComposedChanged.java:19)
        at com.qdesrame.openapi.diff.model.Changed.isUnchanged(Changed.java:21)
        at com.qdesrame.openapi.diff.utils.ChangedUtils.isUnchanged(ChangedUtils.java:9)
        at com.qdesrame.openapi.diff.utils.ChangedUtils.isChanged(ChangedUtils.java:17)
        at com.qdesrame.openapi.diff.compare.ExtensionsDiff.diff(ExtensionsDiff.java:79)
        at com.qdesrame.openapi.diff.compare.schemadiffresult.SchemaDiffResult.diff(SchemaDiffResult.java:61)
        at com.qdesrame.openapi.diff.compare.SchemaDiff.computeDiff(SchemaDiff.java:316)
        at com.qdesrame.openapi.diff.compare.SchemaDiff.computeDiff(SchemaDiff.java:27)
        at com.qdesrame.openapi.diff.compare.ReferenceDiffCache.cachedDiff(ReferenceDiffCache.java:51)
        at com.qdesrame.openapi.diff.compare.SchemaDiff.diff(SchemaDiff.java:282)
        at com.qdesrame.openapi.diff.compare.schemadiffresult.SchemaDiffResult.diff(SchemaDiffResult.java:75)
        at com.qdesrame.openapi.diff.compare.schemadiffresult.ComposedSchemaDiffResult.diff(ComposedSchemaDiffResult.java:85)
        at com.qdesrame.openapi.diff.compare.SchemaDiff.computeDiff(SchemaDiff.java:316)
        at com.qdesrame.openapi.diff.compare.SchemaDiff.computeDiff(SchemaDiff.java:27)
        at com.qdesrame.openapi.diff.compare.ReferenceDiffCache.cachedDiff(ReferenceDiffCache.java:51)
        at com.qdesrame.openapi.diff.compare.SchemaDiff.diff(SchemaDiff.java:282)
        at com.qdesrame.openapi.diff.compare.schemadiffresult.ArraySchemaDiffResult.diff(ArraySchemaDiffResult.java:31)

The problem occurs only with allOf. Replacing it with oneOf fixes the problem.

Tái hiện lỗi với schema được cung cấp và openapi-diff spec.yaml spec.yaml. Theo dõi các lời gọi đệ quy qua SchemaDiff, ReferenceDiffCache, ComposedSchemaDiffResult và ArraySchemaDiffResult, sử dụng stack trace làm điểm bắt đầu. Hoàn thành khi việc so sánh schema allOf đệ quy kết thúc mà không có StackOverflowError.