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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