i have taken a very hard look @ the code believe i can't still figure it
out.
please can i get @ least an example or clue of where or what you mean.
thanks
On Sun, May 11, 2008 at 5:54 PM, Jonathan Locke <[EMAIL PROTECTED]>
wrote:
>
>
> take a hard look. you never assigned to field model.
>
>
> kengimel wrote:
> >
> > Hi,
> >
> > I am new to wicket and while trying out this snippet of code.
> >
> >
> > public class GetQuoteSymbol extends WebPage {
> >
> > private Model model;
> >
> > public GetQuoteSymbol() {
> >
> > Form form = new Form("f") {
> >
> > protected void onSubmit() {
> > String sym = (String) model.getObject();
> > int stockValue = sym.hashCode() % 100;
> > QuoteResult quoteResult = new QuoteResult(stockValue);
> > setResponsePage(quoteResult);
> > }
> > };
> > Model model = new Model("MSFT");
> > TextField symbol = new TextField("sym", model);
> >
> > form.add(symbol);
> > add(form);
> >
> > }
> >
> > }
> >
> >
> >
> > <head>
> >
> > <title>GetQuoteSymbol</title>
> > <link rel="stylesheet" type="text/css" href="style.css"/>
> > </head>
> > <body>
> > <!-- -->
> >
> > <form wicket:id="f">
> > <input type="text" wicket:id="sym">
> > <input type="submit" value="Ok">
> > </form>
> > </body>
> > </html>
> >
> >
> > public class QuoteResult extends WebPage {
> > public QuoteResult(int stockValue) {
> >
> > add(new Label("v", Integer.toString(stockValue)));
> > }
> >
> > }
> >
> > <html xmlns:wicket>
> > <head>
> > <meta http-equiv="Content-Type" content="text/html;
> > charset=UTF-8"/>
> > <title>QuoteResult</title>
> > <link rel="stylesheet" type="text/css" href="style.css"/>
> > </head>
> > <body>
> > <!-- -->
> > The stock value is: 100.
> > </body>
> > </html>
> >
> > when i execute the code i encountered.
> >
> > this error::
> >
> > WicketMessage: Method onFormSubmitted of interface
> > org.apache.wicket.markup.html.form.IFormSubmitListener targeted at
> > component [MarkupContainer [Component id = f, page =
> > myapp.stockquote.GetQuoteSymbol, path = 2:f.GetQuoteSymbol$1, isVisible =
> > true, isVersioned = true]] threw an exception
> >
> > Root cause:
> >
> > java.lang.NullPointerException
> > at myapp.stockquote.GetQuoteSymbol$1.onSubmit(GetQuoteSymbol.java:26)
> > at org.apache.wicket.markup.html.form.Form.delegateSubmit(Form.java:1328)
> > at org.apache.wicket.markup.html.form.Form.onFormSubmitted(Form.java:776)
> > at java.lang.reflect.Method.invoke(Method.java:597)
> > at
> >
> org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:183)
> > at
> >
> org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
> > 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:235)
> > at
> >
> org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
> > at
> >
> org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
> > at
> >
> org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:175)
> > at
> >
> org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
> > at
> >
> org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
> > at
> >
> org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
> > at
> >
> org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:263)
> > at
> >
> org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:844)
> > at
> >
> org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:584)
> > at
> org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
> > at java.lang.Thread.run(Thread.java:619)
> >
> > Complete stack:
> >
> > org.apache.wicket.WicketRuntimeException: Method onFormSubmitted of
> > interface org.apache.wicket.markup.html.form.IFormSubmitListener targeted
> > at component [MarkupContainer [Component id = f, page =
> > myapp.stockquote.GetQuoteSymbol, path = 2:f.GetQuoteSymbol$1, isVisible =
> > true, isVersioned = true]] threw an exception
> > at
> >
> org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:194)
> > at
> >
> org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
> > 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)
> >
> > java.lang.reflect.InvocationTargetException
> > at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
> > at
> >
> sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
> > at java.lang.reflect.Method.invoke(Method.java:597)
> > at
> >
> org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:183)
> > at
> >
> org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
> > 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)
> >
> > can someone tell me what might be wrong..... thanks
> >
>
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--
Okpala Ikenna N. Jr.
