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https://issues.apache.org/jira/browse/WICKET-4968?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Michael Frankerl updated WICKET-4968:
-------------------------------------
Component/s: wicket
> NPE in FencedFeedbackPanel#onRemove
> -----------------------------------
>
> Key: WICKET-4968
> URL: https://issues.apache.org/jira/browse/WICKET-4968
> Project: Wicket
> Issue Type: Bug
> Components: wicket
> Affects Versions: 6.4.0
> Reporter: Michael Frankerl
>
> There is a potential NPE in
> FencedFeedbackPanel.onRemove(FencedFeedbackPanel.java:155).
> If a FencedFeedbackPanel instance is used two times ( i.e. wizard is
> replacing components on navigation) the MetaDataKey "FENCE_KEY" could be
> null. This causes a NPE in any further call of "onRemove".
> Example Stacktrace:
> Caused by: java.lang.NullPointerException
> at
> org.apache.wicket.feedback.FencedFeedbackPanel.onRemove(FencedFeedbackPanel.java:155)
> at org.apache.wicket.Component.internalOnRemove(Component.java:1102)
> at
> org.apache.wicket.MarkupContainer.removeChildren(MarkupContainer.java:1589)
> at org.apache.wicket.Component.internalOnRemove(Component.java:1110)
> at
> org.apache.wicket.MarkupContainer.removeChildren(MarkupContainer.java:1589)
> at org.apache.wicket.Component.internalOnRemove(Component.java:1110)
> at
> org.apache.wicket.MarkupContainer.removeChildren(MarkupContainer.java:1589)
> at org.apache.wicket.Component.internalOnRemove(Component.java:1110)
> at
> org.apache.wicket.MarkupContainer.removeChildren(MarkupContainer.java:1589)
> at org.apache.wicket.Component.internalOnRemove(Component.java:1110)
> at
> org.apache.wicket.MarkupContainer.removedComponent(MarkupContainer.java:1341)
> at org.apache.wicket.MarkupContainer.replace(MarkupContainer.java:739)
> at
> org.apache.wicket.extensions.wizard.Wizard.onActiveStepChanged(Wizard.java:233)
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