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https://issues.apache.org/jira/browse/FLINK-40958?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18130725#comment-18130725
 ] 

Martijn Visser commented on FLINK-40958:
----------------------------------------

Another one, master push 2026-10-21 (JDK 17):
https://github.com/apache/flink/actions/runs/39577557033/job/119150969550

{code}
[ERROR] 
org.apache.flink.types.variant.JsonVariantFormatterTest.testDeeplyNestedValueRenders
 -- Time elapsed: 0.574 s <<< ERROR!
java.lang.StackOverflowError
        at 
org.apache.flink.types.variant.BinaryVariantInternalBuilder.lambda$appendVariantImpl$2(BinaryVariantInternalBuilder.java:654)
        at 
org.apache.flink.types.variant.BinaryVariantUtil.handleArray(BinaryVariantUtil.java:843)
        at 
org.apache.flink.types.variant.BinaryVariantInternalBuilder.appendVariantImpl(BinaryVariantInternalBuilder.java:650)
{code}

> VARIANT might fail with StackOverflow
> -------------------------------------
>
>                 Key: FLINK-40958
>                 URL: https://issues.apache.org/jira/browse/FLINK-40958
>             Project: Flink
>          Issue Type: Improvement
>          Components: API / Core
>    Affects Versions: 2.4.0
>            Reporter: Sergey Nuyanzin
>            Assignee: Sergey Nuyanzin
>            Priority: Major
>              Labels: pull-request-available
>             Fix For: 2.4.0
>
>
> for instance for deep {{VARIANT}}s
> {noformat}
> RowDataToJsonConvertersTest.testVariantNestedBeyondJsonParserLimitAtCutEdgeIsIllegalUserInput:225
>  02:50
> Expecting actual throwable to be an instance of:02:50
>   org.apache.flink.util.IllegalUserInputRuntimeException02:50
> but was:02:50
>   java.lang.StackOverflowError02:50
>       at 
> org.apache.flink.types.variant.JsonVariantFormatter.lambda$appendNode$1(JsonVariantFormatter.java:118)02:50
>       at 
> org.apache.flink.types.variant.BinaryVariantUtil.handleArray(BinaryVariantUtil.java:843)02:50
>       at 
> org.apache.flink.types.variant.JsonVariantFormatter.appendNode(JsonVariantFormatter.java:114)02:50
>       ...(1021 remaining lines not displayed - this can be changed with 
> Assertions.setMaxStackTraceElementsDisplayed)
> {noformat}
> probably better to use loop



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