NPE when the underlaying model changed and ajax re-appear.
-----------------------------------------------------------
Key: WICKET-3162
URL: https://issues.apache.org/jira/browse/WICKET-3162
Project: Wicket
Issue Type: Bug
Affects Versions: 1.4.13
Environment: wicket 1.4.13
Reporter: smallufo
<span wicket:id="border">
<wicket:container wicket:id="commentsView">
<div>
//comment layout
</div>
</wicket:container>
</span>
And the code :
add(border);
ListView<Comment> commentsView = new ListView<Comment>("commentsView" , new
LoadableDetachableModel<List<Comment>>()
{
@Override
protected List<Comment> load() {
return commentDao.getComments(0 , 10);
}
})
{
@Override
protected void populateItem(ListItem<Comment> item) {
//comment layout
}
};
border.add(commentsView);
commentsView.setReuseItems(false);
The Panel has a border , with a clickable button , can be used to
collapse/expand the content of the border with AJAX.
Here is my steps :
1. I first collapse the panel .
2. Then open another browser panel , add a comment. (the underlaying data model
is changed)
3. Back to the original panel , expand the panel ...
And I got a NPE :
2010-11-12 05:19:12,661 ERROR wicket.RequestCycle - Exception in rendering
component: [MarkupContainer [Component id = _body]]
org.apache.wicket.WicketRuntimeException: Exception in rendering component:
[MarkupContainer [Component id = _body]]
at org.apache.wicket.Component.renderComponent(Component.java:2725)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1538)
at org.apache.wicket.Component.render(Component.java:2517)
at
org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1440)
at
org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1603)
at
org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1527)
at org.apache.wicket.Component.renderComponent(Component.java:2686)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1538)
...
Caused by: java.lang.NullPointerException
at
org.apache.wicket.markup.html.border.Border$BorderBodyContainer.onComponentTagBody(Border.java:375)
at org.apache.wicket.Component.renderComponent(Component.java:2686)
... 45 more
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