java.lang.NullPointerException at
wicket.markup.html.list.ListView.renderItem(ListView.java:676)
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Key: WICKET-943
URL: https://issues.apache.org/jira/browse/WICKET-943
Project: Wicket
Issue Type: Bug
Components: wicket
Affects Versions: 1.2.6
Environment: Window XP SP3, Java 1.6, Tomcat 5.0_09
Reporter: Alexander Suslov
Priority: Blocker
Fix For: 1.2.7
This problem happens if parent component has been hidden by authorization
strategy during the previous page render, but on the next render parent
component becomes visible. This problem is common for all repeaters. The
problem here is in internalOnAttach() method of repeaters. This method will not
populate items if it not visible in hierarchy, but when it checks this it use
old visible state (Component.FLAG_IS_RENDER_ALLOWED) of component (itself and
parent components), this state is changed after setRenderAllowed() method in
Component.java on 1630 line returns, but internalAttach() method is called
earlier in Component.java on 1624 line. After that component become visible and
will be rendered. But it can't be rendered because items were not populated, so
null pointer exception occurs.
This problem can be fixed if method calls of internalAttach() and
setRenderAllowed(isActionAuthorized(RENDER)) will be swapped or logic of
repeaters (ListView, DataView, etc) components will be changed.
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