Hi, I have been following http://cwiki.apache.org/WICKET/facebook-integration.html and version tomcat 5.5.25. and ran NullPointerException.
TH Lim wrote: > > Hi, > I have been following the tip in the Wiki, > http://cwiki.apache.org/WICKET/facebook-integration.html and ran into > NullPointerException. The Login class is exactly the class mentioned in > the Wiki. > > SEVERE: Can't instantiate page using constructor public reno.Login() > org.apache.wicket.WicketRuntimeException: Can't instantiate page using > constructor public reno.Login() > at > org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:168) > at > org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:58) > at > org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:92) > at > org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.newPage(BookmarkablePageRequestTarget.java:268) > at > org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.getPage(BookmarkablePageRequestTarget.java:283) > at > org.apache.wicket.request.target.component.BookmarkablePageRequestTarget.processEvents(BookmarkablePageRequestTarget.java:210) > at > org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:91) > at > org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1166) > at org.apache.wicket.RequestCycle.step(RequestCycle.java:1243) > at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1331) > at org.apache.wicket.RequestCycle.request(RequestCycle.java:493) > at > org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:363) > at > org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:194) > 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:213) > at > org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:174) > 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:874) > 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:689) > at java.lang.Thread.run(Unknown Source) > > java.lang.NullPointerException > at org.thlim.sample.wicket.Login.<init>(Login.java:23) > at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native > Method) > at java.lang.reflect.Constructor.newInstance(Constructor.java:494) > at java.lang.Class.newInstance0(Class.java:350) > at java.lang.Class.newInstance(Class.java:303) > ...... > > I traced the code and found that the application didn't redirect as > stipulated here, > > private void forceLogin(Page page) > { > page.getRequestCycle().setRequestTarget(new > RedirectRequestTarget("http://www.facebook.com/login.php?api_key="; + > _apiKey + "&v=1.0")); > } > > I presume the line of code will redirect the browser to > "http://www.facebook.com/login.php?api_key=xxxx&v=1.0"; when I logon to the > URL http://apps.facebook.com/xxx/. It didn't and it went straight to the > Login and caused the NPE. I realized that ExceptionErrorPage page was > created after it failed to be redirected to > "http://www.facebook.com/login.php?api_key=xxxx&v=1.0"; the 1st time. > > If I logon manually e.g. point my browser to > http://www.facebook.com/login.php?api_key=xxxx&v=1.0, my Facebook app will > work fine. What did I do wrong? > > Thanks > > /lim/ > > -- View this message in context: http://www.nabble.com/Facebook-Wicket-Integration-tp16558748p17096971.html Sent from the Wicket - User mailing list archive at Nabble.com. --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
