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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