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https://issues.apache.org/jira/browse/CAMEL-10562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15725955#comment-15725955
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Stefan commented on CAMEL-10562:
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This issue is a blocker in our environment, because we can not simply change
the JRE in use on our servers. So I set the priority only to critical because
of the outdated affected version of Java and the because I'm not sure, if other
JREs, i.e. the IBM JRE, are affected, too.
I will add a pull request later. Currently I'm not able to clone the git repo :(
> UnsupportedOperationException in DefaultCamelContext#safelyStartRouteServices
> -----------------------------------------------------------------------------
>
> Key: CAMEL-10562
> URL: https://issues.apache.org/jira/browse/CAMEL-10562
> Project: Camel
> Issue Type: Bug
> Components: camel-core
> Affects Versions: 2.18.0, 2.18.1
> Environment: Oracle JDK 1.8.0_(<20)
> Reporter: Stefan
> Priority: Critical
>
> DefaultCamelContext#safelyStartRouteServices the following code is called:
> {code}
> Collections.sort(startupListeners, new OrderedComparator());
> {code}
> {{startupListeners}} is a {{CopyOnWriteArrayList}}.
> In the specification of Collections.sort it is stated, that an
> UnsupportedOperationException is thrown if the collections listiterator
> doesn't support the set-operation.
> Sadly, the documentation of CopyOnWriteArrayList#listIterator states, that
> the listiterator doesn't support this operation.
> As expected in this szenario, the UnsupportedOperationException is thrown
> during startup of the camel context if an Oracle JDK 1.8.0 with patchlevel
> lower than 20 is used.
> In 1.8.0_20 the operation Collections#sort(List,Comparator) is rewritten to
> delegate to List#sort(Comparator) so it doesn't matter anymore if the lists
> listIterator supports the set-operation.
> The issue can trivially been fixed by replacing the line by
> {code}
> startupListeners.sort(new OrderedComparator());
> {code}
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