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Posted to issues@commons.apache.org by "Piotr Karwasz (Jira)" <ji...@apache.org> on 2025/08/15 05:41:00 UTC
[jira] [Updated] (COLLECTIONS-838) Calling SetUtils.union on multiple instances of SetView causes JVM to hang

     [ https://issues.apache.org/jira/browse/COLLECTIONS-838?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Piotr Karwasz updated COLLECTIONS-838:
--------------------------------------
    Fix Version/s: 4.6.0

> Calling SetUtils.union on multiple instances of SetView causes JVM to hang
> --------------------------------------------------------------------------
>
>                 Key: COLLECTIONS-838
>                 URL: https://issues.apache.org/jira/browse/COLLECTIONS-838
>             Project: Commons Collections
>          Issue Type: Bug
>          Components: Collection
>    Affects Versions: 4.4
>            Reporter: Tanmay Ambre
>            Priority: Major
>             Fix For: 4.6.0
>
>         Attachments: Test1.java
>
>
> hi,
>  
> Please have a look at the attached test class. If I call the SetUtils.union multiple times (~40) the JVM hangs. However, it will complete if I reduce the iterations (~30). 
>  
> Stack Trace:
>  
> "main" #1 prio=5 os_prio=31 cpu=829612.28ms elapsed=839.75s tid=0x000000015d008a00 nid=0x1803 runnable  [0x000000016ffc1000]
>    java.lang.Thread.State: RUNNABLE
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:239)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.FilterIterator.setNextObject(FilterIterator.java:174)
> at org.apache.commons.collections4.iterators.FilterIterator.hasNext(FilterIterator.java:86)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at org.apache.commons.collections4.iterators.IteratorChain.updateCurrentIterator(IteratorChain.java:222)
> at org.apache.commons.collections4.iterators.IteratorChain.hasNext(IteratorChain.java:236)
> at org.apache.commons.collections4.iterators.UnmodifiableIterator.hasNext(UnmodifiableIterator.java:73)
> at java.lang.Iterable.forEach(java.base@17.0.2/Iterable.java:74)
> at Test1.main(CollectionFunctionsTest.java:107)



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