Fix StackOverflow when exporting POJOs with custom converters#899
Fix StackOverflow when exporting POJOs with custom converters#899utafrali wants to merge 2 commits intoapache:mainfrom
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Exclude circular reference fields from @EqualsAndHashCode to prevent infinite recursion during POJO export. Closes apache#889
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@utafrali I tried ZonedDateTimeConverterTest locally with -Dmaven.test.skip=false, but it still fails with StackOverflowError.
The failing test is ZonedDateTimeConverterTest.writePojoWithZonedDateTimeAndCustomConverter.
From the stack trace, this PR removes the sheet/table parent reference cycles, but another cycle is still left:
WriteWorkbookHolder.hashCode() -> WorkbookWriteHandlerContext.hashCode() -> WriteWorkbookHolder.hashCode()
workbookWriteHandlerContext is currently excluded only from toString, not from hashCode, because the annotation is lombok.ToString.Exclude.
So the hashCode recursion is still reachable through this field.
This might be addressing the recursion symptom, but I wonder if there is a more fundamental issue in how equals/hashCode is defined for these holder/context objects.
For now, I think the priority is to make sure the test passes and the recursion path is fully removed.
Could you please check this path and rerun the test with -Dmaven.test.skip=false?
| @Getter | ||
| @Setter | ||
| @EqualsAndHashCode | ||
| @EqualsAndHashCode(exclude = {"parentWriteWorkbookHolder", "hasBeenInitializedTable"}) |
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This excludes the sheet's parent workbook holder from equals/hashCode, which makes sense. But I still see a StackOverflowError when I run the new test locally.
The remaining loop seems to be:
WriteWorkbookHolder.hashCode() -> WorkbookWriteHandlerContext.hashCode() -> WriteWorkbookHolder.hashCode()
Could you check this path too?
| row.setAmount(new BigDecimal("1234.5")); | ||
| row.setCreatedAt(ZonedDateTime.of(2026, 3, 24, 15, 30, 45, 0, ZoneId.of("Asia/Shanghai"))); | ||
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| Assertions.assertDoesNotThrow(() -> FesodSheet.write(out, MixedMetadataRow.class) |
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I ran this test locally with -Dmaven.test.skip=false, but it still fails with StackOverflowError.
So this is a good reproducer, but the current fix does not make it pass yet.
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Purpose of the pull request
Closes #889
Fixes the stack overflow error that happens when exporting POJOs with custom converters.
What's changed?
The issue was @EqualsAndHashCode trying to hash the entire object graph, including parent references. Since WriteSheetHolder has parentWriteWorkbookHolder and WriteTableHolder has parentWriteSheetHolder, these circular references caused infinite recursion during equals/hashcode generation.
Excluded those parent fields from the @EqualsAndHashCode annotation. This breaks the circular dependency without affecting the equality logic for these holders. Also added tests for the ZonedDateTime converter to make sure custom converters work properly with the fix.
Checklist