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.
