Hi,
I'd like to customize FormComponentFeedbackBorder class to provide a error
icon, so I extend FormComponentFeedbackBorder class and copy
FormComponentFeedbackBorder.html from wicket source.
I modify FormComponentFeedbackBorder.html to add below:
<wicket:border>
<span wicket:id="errorIndicator"><img alt="Error!"
src="icon.gif"/><span style="color:red;">!</span><br/></span>
<wicket:body/>
</wicket:border>
If I remove <img> tag from my html, my application works fine, but add <img>
tag, it will show below exception message:
WicketMessage: Exception in rendering component: [MarkupContainer
[Component id = _header_0]]
Root cause:
java.lang.NullPointerException
at java.util.concurrent.ConcurrentHashMap.get(ConcurrentHashMap.java:768)
at
org.apache.wicket.markup.MarkupCache$DefaultCacheImplementation.get(MarkupCache.java:744)
at org.apache.wicket.markup.MarkupCache.removeMarkup(MarkupCache.java:131)
at org.apache.wicket.markup.MarkupCache.loadMarkup(MarkupCache.java:491)
at
org.apache.wicket.markup.MarkupCache.loadMarkupAndWatchForChanges(MarkupCache.java:559)
at org.apache.wicket.markup.MarkupCache.getMarkup(MarkupCache.java:325)
at
org.apache.wicket.markup.MarkupCache.getMarkupStream(MarkupCache.java:216)
at
org.apache.wicket.MarkupContainer.getAssociatedMarkupStream(MarkupContainer.java:351)
at
org.apache.wicket.markup.html.ContainerWithAssociatedMarkupHelper.renderHeadFromAssociatedMarkupFile(ContainerWithAssociatedMarkupHelper.java:72)
at
org.apache.wicket.markup.html.WebMarkupContainerWithAssociatedMarkup.renderHeadFromAssociatedMarkupFile(WebMarkupContainerWithAssociatedMarkup.java:73)
at org.apache.wicket.markup.html.panel.Panel.renderHead(Panel.java:137)
at
org.apache.wicket.markup.html.internal.HtmlHeaderContainer$1.component(HtmlHeaderContainer.java:231)
at
org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:878)
at
org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:893)
at
org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:918)
at
org.apache.wicket.markup.html.internal.HtmlHeaderContainer.renderHeaderSections(HtmlHeaderContainer.java:222)
at
org.apache.wicket.markup.html.internal.HtmlHeaderContainer.onComponentTagBody(HtmlHeaderContainer.java:137)
at org.apache.wicket.Component.renderComponent(Component.java:2626)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1536)
at org.apache.wicket.Component.render(Component.java:2457)
at org.apache.wicket.MarkupContainer.autoAdd(MarkupContainer.java:229)
at
org.apache.wicket.markup.resolver.HtmlHeaderResolver.resolve(HtmlHeaderResolver.java:80)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1441)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1552)
at org.apache.wicket.Page.onRender(Page.java:1545)
at org.apache.wicket.Component.render(Component.java:2457)
at org.apache.wicket.Page.renderPage(Page.java:914)
at
org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:262)
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:456)
at
org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:289)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:849)
at
org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:583)
at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:454)
at java.lang.Thread.run(Thread.java:619)
Complete stack:
org.apache.wicket.WicketRuntimeException: Exception in rendering
component: [MarkupContainer [Component id = _header_0]]
at org.apache.wicket.Component.renderComponent(Component.java:2665)
at org.apache.wicket.MarkupContainer.onRender(MarkupContainer.java:1536)
at org.apache.wicket.Component.render(Component.java:2457)
at org.apache.wicket.MarkupContainer.autoAdd(MarkupContainer.java:229)
at
org.apache.wicket.markup.resolver.HtmlHeaderResolver.resolve(HtmlHeaderResolver.java:80)
at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1441)
at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1552)
at org.apache.wicket.Page.onRender(Page.java:1545)
at org.apache.wicket.Component.render(Component.java:2457)
at org.apache.wicket.Page.renderPage(Page.java:914)
at
org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:262)
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:456)
Please tell me why NullPointException just by adding a <img> html tag?
Thank you very much
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