Michael Frankerl created WICKET-4968:
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Summary: NPE in FencedFeedbackPanel#onRemove
Key: WICKET-4968
URL: https://issues.apache.org/jira/browse/WICKET-4968
Project: Wicket
Issue Type: Bug
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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