This breaks the concept of Model being evaluated when component is rendered and not beforehand. Moreover, this is an inconsistent behavior. System should have the same behavior regardless whether log is enabled or not.
Johan Compagner wrote: > seeing if a component is visible or not in the toString() impl is > pretty nice to have > > I think you should make your isVisible() a bit more safe. > What if you debug log your self a bit more about this ? and you use it > in a listview or something > then it can also be removed from the page. > Or if you use it in a panel that wants to know upfront stuff from your > component > (and the panel itself isn't added yet to a parent) > > johan > > > On 6/6/07, *Nili Adoram* <[EMAIL PROTECTED] > <mailto:[EMAIL PROTECTED]>> wrote: > > I come across a very puzzling behavior in wicket-1.2.2. > I add a component to its container when the page is initialized, > BEFORE > it is rendered and before page model finished to initialize. > if log4j is configured to enable wicket debug, the container > toString() > is called. > This method invoked isVisible() of the container. > I have overriden isVisible(), to query the page model before deciding > whether the component is actually visible. > I assumed this method is called when the component is rendered, > and by > that time the model is completely initialized. > However, since it was called before component rendering, my code > failed > and the page failed to be created. > My question is: > 1. Why isn't toString() of Component a safe method ? > 2. Why does it call isVisible before page is rendered? > Thanks > Nili > > java.lang.NullPointerException > at > > com.qlusters.qrm.plugins.provision.web.ProvisionWebUtils.isVeDeleted(ProvisionWebUtils.java > :374) > at > > com.qlusters.qrm.plugins.provision.web.ProvisioningRequestSummaryForm$15.isVisible(ProvisioningRequestSummaryForm.java:405) > at wicket.Component.toString(Component.java:2176) > at wicket.MarkupContainer.toString(MarkupContainer.java:685) > at wicket.MarkupContainer.toString(MarkupContainer.java:673) > at java.lang.String.valueOf(String.java:2615) > at java.lang.StringBuffer.append (StringBuffer.java:220) > at wicket.MarkupContainer.add(MarkupContainer.java:149) > at > > com.qlusters.qrm.plugins.provision.web.ProvisioningRequestSummaryForm.addChangeIndication(ProvisioningRequestSummaryForm.java > :453) > at > > com.qlusters.qrm.plugins.provision.web.ProvisioningRequestSummaryForm.init(ProvisioningRequestSummaryForm.java:47) > at > com.qlusters.qrm.plugins.provision.web.ProvisioningRequestSummary.doView > (ProvisioningRequestSummary.java:50) > at > > com.qlusters.qrm.web.wicket.WebPageFactory.decorate(WebPageFactory.java:84) > at > com.qlusters.qrm.web.wicket.WebPageFactory.newPage(WebPageFactory.java:53) > > at > > wicket.request.target.component.BookmarkablePageRequestTarget.newPage(BookmarkablePageRequestTarget.java:271) > at > > wicket.request.target.component.BookmarkablePageRequestTarget.getPage(BookmarkablePageRequestTarget.java > :286) > at > > wicket.request.target.component.BookmarkablePageRequestTarget.processEvents(BookmarkablePageRequestTarget.java:205) > at > wicket.request.compound.DefaultEventProcessorStrategy.processEvents > (DefaultEventProcessorStrategy.java:65) > at > > wicket.request.compound.AbstractCompoundRequestCycleProcessor.processEvents(AbstractCompoundRequestCycleProcessor.java:57) > at > wicket.RequestCycle.doProcessEventsAndRespond (RequestCycle.java:852) > at > wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:885) > at wicket.RequestCycle.step(RequestCycle.java:966) > at wicket.RequestCycle.steps(RequestCycle.java :1040) > at wicket.RequestCycle.request(RequestCycle.java:454) > at > wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:216) > at > javax.servlet.http.HttpServlet.service(HttpServlet.java:690) > at > javax.servlet.http.HttpServlet.service(HttpServlet.java:803) > at > > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:269) > at > org.apache.catalina.core.ApplicationFilterChain.doFilter > (ApplicationFilterChain.java:188) > at > > com.qlusters.qrm.server.api.objects.transactions.TransactionFilter.doFilter(TransactionFilter.java:135) > at > org.apache.catalina.core.ApplicationFilterChain.internalDoFilter > (ApplicationFilterChain.java:215) > at > > org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188) > at > > org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java > :210) > at > > org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174) > at > > org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:433) > at > > org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) > at > > org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117) > at > org.apache.catalina.core.StandardEngineValve.invoke > (StandardEngineValve.java:108) > at > > org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:151) > at > org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:870) > at > > org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665) > at > > org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528) > at > > org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81) > at > > org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:685) > at java.lang.Thread.run(Thread.java:595) > > > ------------------------------------------------------------------------- > This SF.net email is sponsored by DB2 Express > Download DB2 Express C - the FREE version of DB2 express and take > control of your XML. 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