You can start by setting a breakpoint and running the application in debug mode.
-Matej On Wed, Aug 19, 2009 at 7:39 PM, Oleg Ruchovets<oruchov...@gmail.com> wrote: > Hi , I am new in wicket. I try to modify wicket in action examples and got > such exception: > > WicketMessage: Error attaching this container for rendering: > [MarkupContainer [Component id = content, page = > wicket.in.action.chapter03.section_3_1.dbdiscounts.web.Index, path = > 1:discounts:content.DiscountsList, isVisible = true, isVersioned = true]] > > Root cause: > > java.lang.NullPointerException > at > wicket.in.action.chapter03.section_3_1.dbdiscounts.web.DiscountsList$1.getItemModels(DiscountsList.java:32) > at > org.apache.wicket.markup.repeater.RefreshingView.onPopulate(RefreshingView.java:104) > at > org.apache.wicket.markup.repeater.AbstractRepeater.onBeforeRender(AbstractRepeater.java:127) > at org.apache.wicket.Component.internalBeforeRender(Component.java:995) > at org.apache.wicket.Component.beforeRender(Component.java:1027) > at > org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1513) > at org.apache.wicket.Component.onBeforeRender(Component.java:3657) > at org.apache.wicket.Component.internalBeforeRender(Component.java:995) > at org.apache.wicket.Component.beforeRender(Component.java:1027) > at > org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1513) > at org.apache.wicket.Component.onBeforeRender(Component.java:3657) > at org.apache.wicket.Component.internalBeforeRender(Component.java:995) > at org.apache.wicket.Component.beforeRender(Component.java:1027) > at > org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1513) > at org.apache.wicket.Component.onBeforeRender(Component.java:3657) > at org.apache.wicket.Page.onBeforeRender(Page.java:1402) > at org.apache.wicket.Component.internalBeforeRender(Component.java:995) > at org.apache.wicket.Component.beforeRender(Component.java:1027) > at org.apache.wicket.Component.prepareForRender(Component.java:2139) > at org.apache.wicket.Page.renderPage(Page.java:870) > at > org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:231) > at > org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:103) > at > org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1172) > at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241) > at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316) > at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) > at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) > at > org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) > at > org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084) > at > org.springframework.orm.hibernate3.support.OpenSessionInViewFilter.doFilterInternal(OpenSessionInViewFilter.java:174) > at > org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:77) > at > org.mortbay.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1084) > at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:360) > at > org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216) > at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181) > at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:726) > at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405) > at > org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206) > at > org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114) > at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152) > at org.mortbay.jetty.Server.handle(Server.java:324) > at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505) > at > org.mortbay.jetty.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:829) > at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:514) > at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211) > at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380) > at > org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395) > at > org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488) > > Complete stack: > > org.apache.wicket.WicketRuntimeException: Error attaching this container for > rendering: [MarkupContainer [Component id = content, page = > wicket.in.action.chapter03.section_3_1.dbdiscounts.web.Index, path = > 1:discounts:content.DiscountsList, isVisible = true, isVersioned = true]] > at > org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1525) > at org.apache.wicket.Component.onBeforeRender(Component.java:3657) > at org.apache.wicket.Component.internalBeforeRender(Component.java:995) > at org.apache.wicket.Component.beforeRender(Component.java:1027) > at > org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1513) > at org.apache.wicket.Component.onBeforeRender(Component.java:3657) > at org.apache.wicket.Component.internalBeforeRender(Component.java:995) > at org.apache.wicket.Component.beforeRender(Component.java:1027) > at > org.apache.wicket.MarkupContainer.onBeforeRenderChildren(MarkupContainer.java:1513) > at org.apache.wicket.Component.onBeforeRender(Component.java:3657) > at org.apache.wicket.Page.onBeforeRender(Page.java:1402) > at org.apache.wicket.Component.internalBeforeRender(Component.java:995) > at org.apache.wicket.Component.beforeRender(Component.java:1027) > at org.apache.wicket.Component.prepareForRender(Component.java:2139) > at org.apache.wicket.Page.renderPage(Page.java:870) > at > org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.respond(BookmarkablePageRequestTarget.java:231) > at > org.apache.wicket.request.AbstractRequestCycleProcessor.respond(AbstractRequestCycleProcessor.java:103) > at > org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1172) > at org.apache.wicket.RequestCycle.step(RequestCycle.java:1241) > at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1316) > at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) > at org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:354) > > Page > > [Page class = > wicket.in.action.chapter03.section_3_1.dbdiscounts.web.Index, id = 1, > version = 0]: > # Path Size Type Model Object > 1 discounts 2,2K > wicket.in.action.chapter03.section_3_1.dbdiscounts.web.DiscountsPanel > > 2 discounts:content 1,2K > wicket.in.action.chapter03.section_3_1.dbdiscounts.web.DiscountsList > > 3 discounts:content:discounts 2,6K > org.apache.wicket.markup.repeater.RefreshingView > 4 discounts:modeLink 2,6K > org.apache.wicket.markup.html.link.Link > 5 discounts:modeLink:linkLabel 2,6K > org.apache.wicket.markup.html.basic.Label [edit] > > > > > The questions is: how can I debug and find pinpoint of my application. I > just tried to take apart chapter of wicket in action which use > wicket+spring+hibernate. > > Thanks in advance. > Oleg. > --------------------------------------------------------------------- To unsubscribe, e-mail: users-unsubscr...@wicket.apache.org For additional commands, e-mail: users-h...@wicket.apache.org
