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https://issues.apache.org/jira/browse/WICKET-3336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12982120#action_12982120
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Willis Blackburn commented on WICKET-3336:
------------------------------------------
Just saw this in the log and thought I should report it. I didn't investigate
it.
> NPE when reloading updated markup in development mode
> -----------------------------------------------------
>
> Key: WICKET-3336
> URL: https://issues.apache.org/jira/browse/WICKET-3336
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 1.5-M3
> Reporter: Willis Blackburn
>
> 11:15:29.504 [ModificationWatcher Task] ERROR
> org.apache.wicket.util.thread.Task - Unhandled exception thrown by user code
> in task ModificationWatcher
> java.lang.NullPointerException: null
> at
> org.apache.wicket.markup.MarkupCache.removeMarkup(MarkupCache.java:151)
> [wicket-1.5-M3.jar:1.5-M3]
> at
> org.apache.wicket.markup.MarkupCache$1.onChange(MarkupCache.java:469)
> [wicket-1.5-M3.jar:1.5-M3]
> at
> org.apache.wicket.util.listener.ChangeListenerSet$1.notify(ChangeListenerSet.java:44)
> [wicket-util-1.5-M3.jar:1.5-M3]
> at
> org.apache.wicket.util.listener.ChangeListenerSet$1.notify(ChangeListenerSet.java:42)
> [wicket-util-1.5-M3.jar:1.5-M3]
> at
> org.apache.wicket.util.listener.ListenerCollection.notify(ListenerCollection.java:78)
> [wicket-util-1.5-M3.jar:1.5-M3]
> at
> org.apache.wicket.util.listener.ChangeListenerSet.notifyListeners(ChangeListenerSet.java:39)
> [wicket-util-1.5-M3.jar:1.5-M3]
> at
> org.apache.wicket.util.watch.ModificationWatcher$1.run(ModificationWatcher.java:162)
> [wicket-util-1.5-M3.jar:1.5-M3]
> at org.apache.wicket.util.thread.Task$1.run(Task.java:115)
> [wicket-util-1.5-M3.jar:1.5-M3]
> at java.lang.Thread.run(Thread.java:680) [na:1.6.0_22]
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