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https://issues.apache.org/jira/browse/WICKET-3162?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12931881#action_12931881
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Igor Vaynberg commented on WICKET-3162:
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the same problem applies. its a fallback link, therefore you have to handle the
case when the target is null. the NPE is in your code, not in wicket.
> 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
> Assignee: Igor Vaynberg
> Attachments: CommentsPanel.html, CommentsPanel.java, Dao.java,
> DaoImpl.java, HomePage.html, HomePage.java, PulldownBorder.html,
> PulldownBorder.java, quickstart.zip, WicketApplication.java
>
> Original Estimate: 0h
> Remaining Estimate: 0h
>
> Hi , I have a simple panel , with a border and a listView :
> <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
>
>
> Igor replied :
> s/border.add(commentsView);/border.getbodycontainer().add(commentsView);/
> I replied :
> I tried , but NPE is still thrown , with the same stacktrace...
> Is there anything I missed ?
> Here is my border's HTML :
> <div wicket:id="content">
> <wicket:body/>
> </div>
> border's java code :
> content = new WebMarkupContainer("content");
>
> content.setOutputMarkupPlaceholderTag(true);
> content.setVisible(defaultExpanded);
> content.setRenderBodyOnly(false);
> add(content);
> content.add(getBodyContainer());
> and the ajax link's onClick() :
> Link<Void> collapseExpandLink = new
> AjaxFallbackLink<Void>("collapseExpandLink")
> {
> @Override
> public void onClick(AjaxRequestTarget target)
> {
> expanded=!expanded;
> content.setVisible(expanded);
> target.addComponent(content);
> }
> };
> add(collapseExpandLink);
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