Should I register PageRequestHandlerTracker anywhere?

On Wed, Aug 29, 2012 at 2:40 PM, James Eliyezar <ja...@mcruncher.com> wrote:

> Alright Paul.
>
> This is my code:
>
> public class HomePage extends WebPage
>> {
>>     private static Logger logger =
>> LoggerFactory.getLogger(HomePage.class);
>>     private static final long serialVersionUID = 1L;
>>
>>     public HomePage(final PageParameters parameters)
>>     {
>>         add(new Label("version",
>> getApplication().getFrameworkSettings().getVersion()));
>>         try {
>>             IPageRequestHandler lastHandler =
>> PageRequestHandlerTracker.getLastHandler(RequestCycle.get());
>>             logger.debug("Last handler: {}", lastHandler);
>>             logger.debug("Requested page", lastHandler.getPage());
>>         } catch (Exception ex) {
>>             logger.error("Error", ex);
>>         }
>>     }
>> }
>>
>>
> This is the log with exception stack trace:
>
> [INFO] Started Jetty Server
>> DEBUG - HomePage                   - Last handler: null
>> ERROR - DefaultExceptionMapper     - Unexpected error occurred
>> org.apache.wicket.WicketRuntimeException: Can't instantiate page using
>> constructor 'public
>> org.apache.wicket.quickstart.HomePage(org.apache.wicket.request.mapper.parameter.PageParameters)'
>> and argument ''. Might be it doesn't exist, may be it is not visible
>> (public).
>>     at
>> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:193)
>>     at
>> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:76)
>>     at
>> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:46)
>>     at
>> org.apache.wicket.DefaultMapperContext.newPageInstance(DefaultMapperContext.java:103)
>>     at
>> org.apache.wicket.request.handler.PageProvider.resolvePageInstance(PageProvider.java:274)
>>     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:93)
>>     at
>> org.apache.wicket.request.handler.render.WebPageRenderer.respond(WebPageRenderer.java:237)
>>     at
>> org.apache.wicket.request.handler.RenderPageRequestHandler.respond(RenderPageRequestHandler.java:167)
>>     at
>> org.apache.wicket.request.cycle.RequestCycle$HandlerExecutor.respond(RequestCycle.java:784)
>>     at
>> org.apache.wicket.request.RequestHandlerStack.execute(RequestHandlerStack.java:64)
>>     at
>> org.apache.wicket.request.cycle.RequestCycle.execute(RequestCycle.java:255)
>>     at
>> org.apache.wicket.request.cycle.RequestCycle.processRequest(RequestCycle.java:212)
>>     at
>> org.apache.wicket.request.cycle.RequestCycle.processRequestAndDetach(RequestCycle.java:283)
>>     at
>> org.apache.wicket.protocol.http.WicketFilter.processRequest(WicketFilter.java:188)
>>     at
>> org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:244)
>>     at
>> org.eclipse.jetty.servlet.ServletHandler$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.server.handler.ContextHandler.doHandle(ContextHandler.java)
>>     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.ContextHandlerCollection.handle(ContextHandlerCollection.java:250)
>>     at
>> org.eclipse.jetty.server.handler.HandlerCollection.handle(HandlerCollection.java:149)
>>     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.AsyncHttpConnection.handle(AsyncHttpConnection.java:46)
>>     at
>> org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:545)
>>     at
>> org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:43)
>>     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:662)
>> Caused by: java.lang.reflect.InvocationTargetException
>>     at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native
>> Method)
>>     at
>> sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
>>     at
>> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
>>     at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
>>     at
>> org.apache.wicket.session.DefaultPageFactory.newPage(DefaultPageFactory.java:170)
>>     ... 41 more
>> Caused by: java.lang.NullPointerException
>>     at org.apache.wicket.quickstart.HomePage.<init>(HomePage.java:22)
>>     ... 46 more
>>
>>
> I've attached a quickstart project to recreate the problem.
>
>    - Unzip it
>    - mvn clean package jetty:run
>    - Point your browser to http://localhost:8080
>    - Watch out the console for the exception.
>
>
> On Wed, Aug 29, 2012 at 12:53 PM, Paul Borș <p...@bors.ws> wrote:
>
>> Might help if you provide a stack trace for the NPE :)
>>
>> Have a great day,
>>     Paul Borș
>>
>> On Aug 29, 2012, at 0:37, James Eliyezar <ja...@mcruncher.com> wrote:
>>
>> > Hi,
>> >
>> > We recently migrated our application to wicket-1.5.8.
>> >
>> > We have an audit aspect based on Spring AOP that shall log the actions
>> > performed in the current page.
>> > In wicket 1.4 we use to get that like
>> > "RequestCycle.get().getResponsePage()".
>> >
>> > This has changed and I know that wicket 1.5 doesn't support this
>> anymore.
>> >
>> > The suggested method as per the wiki is to "use a custom
>> > RequestCycleListener<
>> https://cwiki.apache.org/WICKET/requestcycle-in-wicket-15.html>
>> > ".
>> >
>> > Fortunately, as highlighted in the mailing list, there is a new class in
>> > wicket 1.5.8 named
>> > PageRequestHandlerTracker<
>> http://apache-wicket.1842946.n4.nabble.com/Interpolate-response-with-IResponseFilter-td4651476.html
>> >to
>> > meet this common requirement.
>> >
>> > However, when we use
>> > PageRequestHandlerTracker.getLastHandler(RequestCycle.get()),
>> > and then attempt to call #getPage(), a null pointer exception is thrown.
>> >
>> > Am I doing something wrong here? Please give your suggestions.
>> >
>> > --
>> > Thanks & regards
>> > James Selvakumar
>> > mcruncher.com
>>
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>>
>>
>
>
> --
> Thanks & regards
> James Selvakumar
> mcruncher.com
>
>


-- 
Thanks & regards
James Selvakumar
mcruncher.com

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