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https://issues.apache.org/jira/browse/WICKET-6021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14989125#comment-14989125
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Martin Grigorov commented on WICKET-6021:
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bq. Either we do not allow modifications of the children during iteration
This will be 1) a regression; 2) hard to cover all cases.
bq. The current solution also has a serious problem: children added during
iteration are not visited.
1) 7.1.0 doesn't support this too, it blows with CME
2) I believe 7.0.0/6.x doesn't support this use case too
I'll prepare a test case.
> ConcurrentModificationException in MarkupContainer#iterator#next
> ----------------------------------------------------------------
>
> Key: WICKET-6021
> URL: https://issues.apache.org/jira/browse/WICKET-6021
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 7.1.0
> Reporter: Martin Grigorov
> Fix For: 7.2.0, 8.0.0-M1
>
>
> I'm upgrading Apache Isis to Wicket 7.1.0 (from 6.20) and I face the
> following problem:
> java.util.ConcurrentModificationException
> at java.util.ArrayList$Itr.checkForComodification(ArrayList.java:901)
> at java.util.ArrayList$Itr.next(ArrayList.java:851)
> at org.apache.wicket.MarkupContainer$1.next(MarkupContainer.java:553)
> at org.apache.wicket.MarkupContainer$1.next(MarkupContainer.java:522)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:134)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:162)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:162)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:123)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:192)
> at
> org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:891)
> at
> org.apache.wicket.MarkupContainer.internalInitialize(MarkupContainer.java:995)
> at org.apache.wicket.Page.internalPrepareForRender(Page.java:240)
> at org.apache.wicket.Component.render(Component.java:2304)
> at org.apache.wicket.Page.renderPage(Page.java:1018)
> I think it is caused by the changes in WICKET-5983
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