[jira] [Created] (WICKET-5209) NPE when using ComponentRenderer.renderComponent on a panel with

["GLEIZES Stephane (JIRA)" <ji...@apache.org>]

GLEIZES Stephane created WICKET-5209:
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             Summary: NPE when using ComponentRenderer.renderComponent on a panel with <wicket:enclosure>
                 Key: WICKET-5209
                 URL: https://issues.apache.org/jira/browse/WICKET-5209
             Project: Wicket
          Issue Type: Bug
          Components: wicket
    Affects Versions: 6.8.0
            Reporter: GLEIZES Stephane


Hi,

Consider this example:
<wicket:panel>
	<wicket:enclosure child="externalLink">
		<a wicket:id="externalLink">Link</a>
	</wicket:enclosure>
</wicket:panel>

When trying to render such a panel with ComponentRenderer.renderComponent, a NPE is thrown because Wicket try to render Enclosure without initializing it.

Root cause:
java.lang.NullPointerException
	at org.apache.wicket.markup.html.internal.Enclosure.isVisible(Enclosure.java:143)
	at org.apache.wicket.Component.determineVisibility(Component.java:4363)
	at org.apache.wicket.Component.internalBeforeRender(Component.java:916)
	at org.apache.wicket.Component.beforeRender(Component.java:991)
	at org.apache.wicket.Component.internalPrepareForRender(Component.java:2214)
	at org.apache.wicket.Component.render(Component.java:2303)
	at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1390)
	at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1554)
	at org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1529)
	at org.apache.wicket.MarkupContainer.renderAssociatedMarkup(MarkupContainer.java:689)
	at org.apache.wicket.markup.html.panel.AssociatedMarkupSourcingStrategy.renderAssociatedMarkup(AssociatedMarkupSourcingStrategy.java:76)
	at org.apache.wicket.markup.html.panel.PanelMarkupSourcingStrategy.onComponentTagBody(PanelMarkupSourcingStrategy.java:112)
	at org.apache.wicket.Component.internalRenderComponent(Component.java:2549)
	... 29 more

See the attached quickstart.

I've looked a little into it, and it seems that RenderPage (used by ComponentRenderer to render components) is never initialized.
Therefore the panel's children are never initialized too (see MarkupContainer l.930), and this causes Enclosure to have a null childComponent.

Thanks.

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