Just tried to upgrade an app to 6.13 and it seems to be failing on this tag: <img wicket:id="busyindicator" src="#"/>
Image busyImage = new Image("busyindicator", busyIndicatorImageUrl); busyImage.add(AttributeModifier.replace("src", busyIndicatorImageUrl)); add(busyImage); [PackageResource name = #, scope = com.shadworld.asx.web.page.HomePage, locale = en_US, style = null, variation = null] Any ideas? Root cause: java.lang.IllegalArgumentException: Argument 'delegate' may not be null. at org.apache.wicket.util.lang.Args.notNull(Args.java:41) at org.apache.wicket.util.resource.ResourceStreamWrapper.<init>(ResourceStreamWrapper.java:36) at org.apache.wicket.request.resource.PackageResource$ProcessingResourceStream.<init>(PackageResource.java:476) at org.apache.wicket.request.resource.PackageResource$ProcessingResourceStream.<init>(PackageResource.java:472) at org.apache.wicket.request.resource.PackageResource.internalGetResourceStream(PackageResource.java:465) at org.apache.wicket.request.resource.PackageResource.getCacheableResourceStream(PackageResource.java:395) at org.apache.wicket.request.resource.PackageResource.getCacheKey(PackageResource.java:227) at org.apache.wicket.request.resource.caching.version.RequestCycleCachedResourceVersion.getVersion(RequestCycleCachedResourceVersion.java:81) at org.apache.wicket.request.resource.caching.FilenameWithVersionResourceCachingStrategy.decorateUrl(FilenameWithVersionResourceCachingStrategy.java:102) at org.apache.wicket.core.request.mapper.BasicResourceReferenceMapper.mapHandler(BasicResourceReferenceMapper.java:238) at org.apache.wicket.request.mapper.ParentPathReferenceRewriter.mapHandler(ParentPathReferenceRewriter.java:91) at org.apache.wicket.request.mapper.CompoundRequestMapper.mapHandler(CompoundRequestMapper.java:215) at org.apache.wicket.request.cycle.RequestCycle.mapUrlFor(RequestCycle.java:429) at org.apache.wicket.request.cycle.RequestCycle.urlFor(RequestCycle.java:529) at org.apache.wicket.request.cycle.RequestCycle.urlFor(RequestCycle.java:492) at org.apache.wicket.markup.html.image.resource.LocalizedImageResource.setSrcAttribute(LocalizedImageResource.java:331) at org.apache.wicket.markup.html.image.Image.onComponentTag(Image.java:243) at org.apache.wicket.Component.internalRenderComponent(Component.java:2520) at org.apache.wicket.markup.html.WebComponent.onRender(WebComponent.java:56) at org.apache.wicket.Component.internalRender(Component.java:2379) at org.apache.wicket.Component.render(Component.java:2307) at org.apache.wicket.MarkupContainer.renderNext(MarkupContainer.java:1390) at org.apache.wicket.MarkupContainer.renderAll(MarkupContainer.java:1554) at org.apache.wicket.Page.onRender(Page.java:887) at org.apache.wicket.markup.html.WebPage.onRender(WebPage.java:142) at org.apache.wicket.Component.internalRender(Component.java:2379) at org.apache.wicket.Component.render(Component.java:2307) at org.apache.wicket.Page.renderPage(Page.java:1021) at com.shadworld.asx.web.page.ASXPage.renderPage(ASXPage.java:182) at org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:121) at org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:274) at org.apache.wicket.core.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:165) at org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:861) at org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64) at org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:261) at org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:218) at org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:289) at org.apache.wicket.protocol.http.WicketFilter.processRequestCycle(WicketFilter.java:259) at org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:201) at org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:282) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419) at org.eclipse.jetty.servlets.UserAgentFilter.doFilter(UserAgentFilter.java:82) at org.eclipse.jetty.servlets.GzipFilter.doFilter(GzipFilter.java:294) at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1419) at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:455) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137) at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:557) at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231) at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1075) at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:384) at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193) at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1009) at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135) at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116) at org.eclipse.jetty.server.Server.handle(Server.java:370) at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489) at org.eclipse.jetty.server.BlockingHttpConnection.handleRequest(BlockingHttpConnection.java:53) at org.eclipse.jetty.server.AbstractHttpConnection.headerComplete(AbstractHttpConnection.java:949) at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.headerComplete(AbstractHttpConnection.java:1011) at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:644) at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:235) at org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:72) at org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:264) at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:608) at org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:543) at java.lang.Thread.run(Thread.java:662) 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