[
https://issues.apache.org/jira/browse/WICKET-4258?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13156899#comment-13156899
]
Juha Syrjälä commented on WICKET-4258:
--------------------------------------
The problem seems to be in ListItemModel.getObject() that throws
IndexOutOfBoundsException when the ListView points to empty list. Maybe
ListItemModel.getObject() should just return null in this case or there should
be a null safe version of getObject() method.
/**
* @see org.apache.wicket.model.IModel#getObject()
*/
public T getObject()
{
return listView.getModelObject().get(index);
}
> DebugBar displays stacktrace with FeedbackPanels
> ------------------------------------------------
>
> Key: WICKET-4258
> URL: https://issues.apache.org/jira/browse/WICKET-4258
> Project: Wicket
> Issue Type: Bug
> Components: wicket-devutils
> Affects Versions: 1.5.3
> Reporter: Juha Syrjälä
> Priority: Minor
> Attachments: WICKET-4258-quickstart.tar.gz
>
>
> Clicking Inspector from DebugBar when a FeedbackPanel is displaying a message
> results in this stacktrace in log. Everything seems to work, extra stuff in
> logs is just annoying.
> ERROR - Component - Error while getting default model object
> for Component: [ListItem [Component id = 0, page = com.mycompany.HomePage,
> path = 8:form:feedback:feedbackul:messages:0.ListItem, isVisible = true,
> isVersioned = false], children = [Component id = message]]
> java.lang.IndexOutOfBoundsException: Index: 0
> at java.util.Collections$EmptyList.get(Collections.java:3204)
> at
> org.apache.wicket.markup.html.list.ListItemModel.getObject(ListItemModel.java:58)
> at
> org.apache.wicket.Component.getDefaultModelObject(Component.java:1640)
> at
> org.apache.wicket.Component.getDefaultModelObjectAsString(Component.java:1668)
> at
> org.apache.wicket.markup.html.debug.PageView$4.component(PageView.java:211)
> at
> org.apache.wicket.markup.html.debug.PageView$4.component(PageView.java:184)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:143)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:161)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:161)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:161)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:161)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:122)
> at org.apache.wicket.util.visit.Visits.visitChildren(Visits.java:191)
> at
> org.apache.wicket.MarkupContainer.visitChildren(MarkupContainer.java:923)
> at
> org.apache.wicket.markup.html.debug.PageView.getComponentData(PageView.java:182)
> at
> org.apache.wicket.markup.html.debug.PageView.<init>(PageView.java:130)
> at
> org.apache.wicket.devutils.inspector.InspectorPage.<init>(InspectorPage.java:66)
> at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
> at
> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
> at
> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
> at java.lang.reflect.Constructor.newInstance(Constructor.java:525)
> at
> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:173)
> at
> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:97)
> at
> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:47)
> at
> org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:107)
> at
> org.apache.wicket.request.handler.PageProvider.resolvePageInstance(PageProvider.java:264)
> at
> org.apache.wicket.request.handler.PageProvider.getPageInstance(PageProvider.java:165)
> at
> org.apache.wicket.request.handler.render.PageRenderer.getPage(PageRenderer.java:78)
> at
> org.apache.wicket.request.handler.render.WebPageRenderer.renderPage(WebPageRenderer.java:105)
> at
> org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:224)
> at
> org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
> at
> org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:750)
> at
> org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
> at
> org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:252)
> at
> org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:209)
> at
> org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:280)
> at
> org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:162)
> at
> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:218)
> at
> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1326)
> at
> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:479)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:119)
> at
> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:520)
> at
> org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:227)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:940)
> at
> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:409)
> at
> org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:186)
> at
> org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:874)
> at
> org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:117)
> at
> org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:110)
> at org.eclipse.jetty.server.Server.handle(Server.java:349)
> at
> org.eclipse.jetty.server.HttpConnection.handleRequest(HttpConnection.java:441)
> at
> org.eclipse.jetty.server.HttpConnection$RequestHandler.headerComplete(HttpConnection.java:904)
> at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:565)
> at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:217)
> at
> org.eclipse.jetty.server.BlockingHttpConnection.handle(BlockingHttpConnection.java:50)
> at
> org.eclipse.jetty.server.bio.SocketConnector$ConnectorEndPoint.run(SocketConnector.java:245)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(QueuedThreadPool.java:598)
> at
> org.eclipse.jetty.util.thread.QueuedThreadPool$3.run(QueuedThreadPool.java:533)
> at java.lang.Thread.run(Thread.java:722)
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