As far as I know, this the way it behaves in 1.4.4 is the correct behavior.
I've used it only when specifying the child of enclosure, not any other
component. Maybe there should be a vote about this.

Alex 


igor.vaynberg wrote:
> 
> hrm, already two people stumbled into this. i was of the mind that the
> way it works now is the correct behavior, but i am starting to think
> maybe i was incorrect...
> 
> -igor
> 
> On Sat, Dec 12, 2009 at 12:39 PM, Vadim Tesis <vad...@hotmail.com> wrote:
>>
>> all,
>>
>>
>>
>> i just migrated to 1.4.4 from 1.4.3 and looks like enclosure
>> functionality changed.  if enclosure doesn't have child element in it, it
>> throws exception.
>>
>> for example following code works in 1.4.3
>>
>>
>>
>>    ...
>>
>>   <wicket:enclosure child="link">
>>       <div>...</div>
>>   </wicket:enclosure>
>>    # ... 
>>
>>    ...
>>
>>
>>
>> but in 1.4.4 it throws exception (see below).
>>
>> is 1.4.4 functionality correct or 1.4.3?
>>
>>
>>
>> Thanks,
>>
>> Vadim
>>
>>
>>
>> [#|2009-12-12T12:54:04.546-0500|INFO|sun-appserver2.1|javax.enterprise.system.stream.out|_ThreadID=20;_ThreadName=httpSSLWorkerThread-80-0;|12:54:04,546
>> ERROR org.apache.wicket.RequestCycle - Exception in rendering component:
>> [MarkupContainer [Component id = enclosure-205]]
>> org.apache.wicket.WicketRuntimeException: Exception in rendering
>> component: [MarkupContainer [Component id = enclosure-205]]
>>  at org.apache.wicket.Component.renderComponent(Component.java:2656)
>>  at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1512)
>>  at org.apache.wicket.Component.render(Component.java:2448)
>>  at org.apache.wicket.MarkupContainer.autoAdd(MarkupContainer.java:229)
>>  at
>> org.apache.wicket.markup.resolver.EnclosureResolver.resolve(EnclosureResolver.java:61)
>>  at
>> org.apache.wicket.markup.resolver.ComponentResolvers.resolve(ComponentResolvers.java:81)
>>  at
>> org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1418)
>>  at
>> org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1577)
>>  at
>> org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1501)
>>  at org.apache.wicket.Component.renderComponent(Component.java:2617)
>>  at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1512)
>>  at org.apache.wicket.Component.render(Component.java:2448)
>>  at
>> org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1414)
>>  at
>> org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1577)
>>  at
>> org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1501)
>>  at
>> org.apache.wicket.markup.html.form.Form.onComponentTagBody(Form.java:1936)
>>  at org.apache.wicket.Component.renderComponent(Component.java:2617)
>>  at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1512)
>>  at org.apache.wicket.markup.html.form.Form.onRender(Form.java:2007)
>>  at org.apache.wicket.Component.render(Component.java:2448)
>>  at
>> org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1414)
>>  at
>> org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1577)
>>  at
>> org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1501)
>>  at org.apache.wicket.Component.renderComponent(Component.java:2617)
>>  at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1512)
>>  at org.apache.wicket.Component.render(Component.java:2448)
>>  at org.apache.wicket.MarkupContainer.autoAdd(MarkupContainer.java:229)
>>  at
>> org.apache.wicket.markup.resolver.MarkupInheritanceResolver.resolve(MarkupInheritanceResolver.java:66)
>>  at
>> org.apache.wicket.markup.resolver.ComponentResolvers.resolve(ComponentResolvers.java:81)
>>  at
>> org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1418)
>>  at
>> org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1577)
>>  at
>> org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1501)
>>  at org.apache.wicket.Component.renderComponent(Component.java:2617)
>>  at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1512)
>>  at org.apache.wicket.Component.render(Component.java:2448)
>>  at org.apache.wicket.MarkupContainer.autoAdd(MarkupContainer.java:229)
>>  at
>> org.apache.wicket.markup.resolver.MarkupInheritanceResolver.resolve(MarkupInheritanceResolver.java:73)
>>  at
>> org.apache.wicket.markup.resolver.ComponentResolvers.resolve(ComponentResolvers.java:81)
>>  at
>> org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1418)
>>  at
>> org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1577)
>>  at
>> org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1501)
>>  at org.apache.wicket.Component.renderComponent(Component.java:2617)
>>  at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1512)
>>  at org.apache.wicket.Component.render(Component.java:2448)
>>  at org.apache.wicket.MarkupContainer.autoAdd(MarkupContainer.java:229)
>>  at
>> org.apache.wicket.markup.resolver.MarkupInheritanceResolver.resolve(MarkupInheritanceResolver.java:66)
>>  at
>> org.apache.wicket.markup.resolver.ComponentResolvers.resolve(ComponentResolvers.java:81)
>>  at
>> org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1418)
>>  at
>> org.apache.wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:1577)
>>  at
>> org.apache.wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:1501)
>>  at org.apache.wicket.Component.renderComponent(Component.java:2617)
>>  at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1512)
>>  at org.apache.wicket.Component.render(Component.java:2448)
>>  at org.apache.wicket.MarkupContainer.autoAdd(MarkupContainer.java:229)
>>  at
>> org.apache.wicket.markup.resolver.MarkupInheritanceResolver.resolve(MarkupInheritanceResolver.java:73)
>>  at
>> org.apache.wicket.markup.resolver.ComponentResolvers.resolve(ComponentResolvers.java:81)
>>  at
>> org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1418)
>>  at
>> org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1528)
>>  at org.apache.wicket.Page.onRender(Page.java:1545)
>>  at org.apache.wicket.Component.render(Component.java:2448)
>>  at org.apache.wicket.Page.renderPage(Page.java:914)
>>  at
>> org.apache.wicket.protocol.http.WebRequestCycle.redirectTo(WebRequestCycle.java:167)
>>  at
>> org.apache.wicket.request.target.coding.HybridUrlCodingStrategy$HybridBookmarkablePageRequestTarget.respond(HybridUrlCodingStrategy.java:904)
>>  at
>> org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:105)
>>  at
>> org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1258)
>>  at org.apache.wicket.RequestCycle.step(RequestCycle.java:1329)
>>  at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1428)
>>  at org.apache.wicket.RequestCycle.request(RequestCycle.java:545)
>>  at
>> org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:479)
>>  at
>> org.apache.wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:138)
>>  at javax.servlet.http.HttpServlet.service(HttpServlet.java:734)
>>  at javax.servlet.http.HttpServlet.service(HttpServlet.java:847)
>>  at
>> org.apache.catalina.core.ApplicationFilterChain.servletService(ApplicationFilterChain.java:427)
>>  at
>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:333)
>>  at
>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
>>  at
>> org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:198)
>>  at
>> org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:75)
>>  at
>> org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:246)
>>  at
>> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:214)
>>  at
>> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:313)
>>  at
>> org.apache.catalina.core.StandardContextValve.invokeInternal(StandardContextValve.java:287)
>>  at
>> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:218)
>>  at
>> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
>>  at
>> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
>>  at com.sun.enterprise.web.WebPipeline.invoke(WebPipeline.java:94)
>>  at
>> com.sun.enterprise.web.PESessionLockingStandardPipeline.invoke(PESessionLockingStandardPipeline.java:98)
>>  at
>> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:222)
>>  at
>> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
>>  at
>> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
>>  at
>> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
>>  at
>> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
>>  at
>> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:166)
>>  at
>> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:648)
>>  at
>> org.apache.catalina.core.StandardPipeline.doInvoke(StandardPipeline.java:593)
>>  at
>> org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:587)
>>  at
>> org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:1096)
>>  at
>> org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:288)
>>  at |#]
>>
>> [#|2009-12-12T12:54:04.546-0500|INFO|sun-appserver2.1|javax.enterprise.system.stream.out|_ThreadID=20;_ThreadName=httpSSLWorkerThread-80-0;|com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.invokeAdapter(DefaultProcessorTask.java:647)
>>  at
>> com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.doProcess(DefaultProcessorTask.java:579)
>>  at
>> com.sun.enterprise.web.connector.grizzly.DefaultProcessorTask.process(DefaultProcessorTask.java:831)
>>  at
>> com.sun.enterprise.web.connector.grizzly.DefaultReadTask.executeProcessorTask(DefaultReadTask.java:341)
>>  at
>> com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:263)
>>  at
>> com.sun.enterprise.web.connector.grizzly.DefaultReadTask.doTask(DefaultReadTask.java:214)
>>  at
>> com.sun.enterprise.web.connector.grizzly.TaskBase.run(TaskBase.java:265)
>>  at
>> com.sun.enterprise.web.connector.grizzly.ssl.SSLWorkerThread.run(SSLWorkerThread.java:106)
>> Caused by: java.lang.NullPointerException
>>  at
>> org.apache.wicket.markup.html.internal.DirectChildTagIterator.findNext(DirectChildTagIterator.java:109)
>>  at
>> org.apache.wicket.markup.html.internal.DirectChildTagIterator.next(DirectChildTagIterator.java:80)
>>  at
>> org.apache.wicket.markup.html.internal.Enclosure.ensureAllChildrenPresent(Enclosure.java:236)
>>  at
>> org.apache.wicket.markup.html.internal.Enclosure.onComponentTagBody(Enclosure.java:169)
>>  at org.apache.wicket.Component.renderComponent(Component.java:2617)
>>  ... 104 more
>>
>>
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