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Posted to users@wicket.apache.org by kengimel <ik...@gmail.com> on 2008/05/11 17:08:52 UTC

Problem with Textfield

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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Re: Problem with Textfield

Posted by Ayodeji Aladejebi <al...@gmail.com>.
You should use a writable model like PropertyModel. Read the documentation
for more info.

So i rewrite your code like this:

try this

First, Create a Backing Bean which will hold 2 values, the value of the
TICKER SYMBOL and the value of the Stock Answer
class StockBean implements Serializable {
  private String stockSymbol;
  private int stockValue;
 ..getter
..setter
}

public class GetQuoteSymbol extends WebPage {
   //declare the backing bean
   private StockBean beanModel;

   public GetQuoteSymbol() {

       Form form = new Form("f") {

           protected void onSubmit() {
               String sym = beanModel.getStockSymbol();  //(String)
model.getObject();
               int stockValue = sym.hashCode() % 100;
               beanModel.setStockValue(stockValue);
          if you want it to display the answer, dont bother forwarding the
pag
              // setResponsePage(this);
           }
       };
// create the backing bean
       beanModel = new StockBean();

//Use propertymodels to map the attributes of a backing bean to a Textfield
or other components
//First parameter is the expression that shows the bean property to map to.
and the other parameter is the bean to map to

       PropertyModel stockSymModel= new
PropertyModel("stockSymbol",beanModel); // this model will be used by the
textfield

       TextField stockField = new TextField("stockField ", stockSymModel);


       PropertyModel stockValModel= new
PropertyModel("stockValue",beanModel); // this model will be used by the
Label that will tell us the answer

       Label valueLabel= new Label("stockLabel", beanModel);

       form.add(stockField );
        form.add(valueLabel);
       add(form);

   }

}

 <form wicket:id="f">
Please Provide your Symbol
           <input type="text" wicket:id="stockField ">
The Present Stock Quote is
<span wicket:id="stockLabel">
0.00
</span>
           <input type="submit" value="Ok">
       </form>

Hope this helps

On 5/11/08, kengimel <ik...@gmail.com> 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
>
> --
> View this message in context:
> http://www.nabble.com/Problem-with-Textfield-tp17170575p17170575.html
> Sent from the Wicket - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>


-- 
Aladejebi Ayodeji A.,
DabarObjects Solutions
Phone: +234 9 481 7 156
Mobile: +234 803 589 1780
Email: deji@dabarobjects.com
Web: www.dabarobjects.com
Blog: blog.dabarobjects.com

Participate, Collaborate, Innovate
Join Community:
http://www.cowblock.net/

Get A Free Blog:
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Re: Problem with Textfield

Posted by Jonathan Locke <jo...@gmail.com>.

yes.  that's what i originally said.  ;-)


Ikenna Okpala wrote:
> 
> Hi,
> 
> i went to bed and woke up this morning and took and another hard look. @
> the
> problem and i changed:
> 
>      Model model = new Model("MSFT");
> 
> to:
> 
>      model = new Model("MSFT");
> 
> and the problem was resolved.
> 
> 
> thanks everyone for helping out still studying wicket hard yet to have a
> final impression.
> 
> On Mon, May 12, 2008 at 12:53 AM, Jonathan Locke
> <jo...@gmail.com>
> wrote:
> 
>>
>>
>> if you assigned to that null field (clearly not with the code below) and
>> you
>> are still getting an NPE, it could not be the /same/ error by definition.
>>  i
>> suggest you slow down, get out a debugger and think this through.
>>
>>
>> kengimel wrote:
>> >
>> > i assigned new Model() to the field.
>> >
>> >  String sym = (String) new Model().getObject();
>> >                 int stockValue = sym.hashCode() % 100;
>> >                 QuoteResult quoteResult = new QuoteResult(stockValue);
>> >                 setResponsePage(quoteResult);
>> >
>> > and it still threw the same error.
>> >
>> > i also found some additional inform from clicking the display page
>> view.
>> >
>> >
>> > Page
>> >
>> >       [Page class = myapp.stockquote.GetQuoteSymbol, id = 0, version =
>> 0]:
>> >       #       Path    Size    Type    Model Object
>> >       1       f       1.6K
>>  org.apache.wicket.markup.html.form.Form
>> >       2       f:sym           813 bytes
>> > org.apache.wicket.markup.html.form.TextField          MSFT
>> >
>> > Jonathan Locke wrote:
>> >>
>> >>
>> >> no, the problem is more basic than that. it would work if new Model()
>> was
>> >> assigned to the field.  instead it is being assigned to a local
>> variable,
>> >> which goes out of scope, leaving the field still null:
>> >>
>> >> Model model = new Model("MSFT");
>> >>
>> >> if the field were final, the compiler would warn that the field was
>> never
>> >> assigned.
>> >>
>> >>
>> >> Newgro wrote:
>> >>>
>> >>> Hello Kengimel,
>> >>>
>> >>> You do this
>> >>>             private Model model;
>> >>> and that
>> >>>     String sym = (String) model.getObject();
>> >>>
>> >>> but you did not
>> >>>     form.setModel(model)
>> >>> or @ least
>> >>>     setModel(model)
>> >>>
>> >>> You only can get things you've assigned before.
>> >>>
>> >>> Cheers
>> >>> Per
>> >>>
>> >>> ---------------------------------------------------------------------
>> >>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>> >>> For additional commands, e-mail: users-help@wicket.apache.org
>> >>>
>> >>>
>> >>>
>> >>
>> >>
>> >
>> >
>>
>> --
>> View this message in context:
>> http://www.nabble.com/Problem-with-Textfield-tp17170575p17179519.html
>> Sent from the Wicket - User mailing list archive at Nabble.com.
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>> For additional commands, e-mail: users-help@wicket.apache.org
>>
>>
> 
> 
> -- 
> Okpala Ikenna N. Jr.
> 
> 

-- 
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Re: Problem with Textfield

Posted by Ikenna Okpala <ik...@googlemail.com>.
Hi,

i went to bed and woke up this morning and took and another hard look. @ the
problem and i changed:

     Model model = new Model("MSFT");

to:

     model = new Model("MSFT");

and the problem was resolved.


thanks everyone for helping out still studying wicket hard yet to have a
final impression.

On Mon, May 12, 2008 at 12:53 AM, Jonathan Locke <jo...@gmail.com>
wrote:

>
>
> if you assigned to that null field (clearly not with the code below) and
> you
> are still getting an NPE, it could not be the /same/ error by definition.
>  i
> suggest you slow down, get out a debugger and think this through.
>
>
> kengimel wrote:
> >
> > i assigned new Model() to the field.
> >
> >  String sym = (String) new Model().getObject();
> >                 int stockValue = sym.hashCode() % 100;
> >                 QuoteResult quoteResult = new QuoteResult(stockValue);
> >                 setResponsePage(quoteResult);
> >
> > and it still threw the same error.
> >
> > i also found some additional inform from clicking the display page view.
> >
> >
> > Page
> >
> >       [Page class = myapp.stockquote.GetQuoteSymbol, id = 0, version =
> 0]:
> >       #       Path    Size    Type    Model Object
> >       1       f       1.6K
>  org.apache.wicket.markup.html.form.Form
> >       2       f:sym           813 bytes
> > org.apache.wicket.markup.html.form.TextField          MSFT
> >
> > Jonathan Locke wrote:
> >>
> >>
> >> no, the problem is more basic than that. it would work if new Model()
> was
> >> assigned to the field.  instead it is being assigned to a local
> variable,
> >> which goes out of scope, leaving the field still null:
> >>
> >> Model model = new Model("MSFT");
> >>
> >> if the field were final, the compiler would warn that the field was
> never
> >> assigned.
> >>
> >>
> >> Newgro wrote:
> >>>
> >>> Hello Kengimel,
> >>>
> >>> You do this
> >>>             private Model model;
> >>> and that
> >>>     String sym = (String) model.getObject();
> >>>
> >>> but you did not
> >>>     form.setModel(model)
> >>> or @ least
> >>>     setModel(model)
> >>>
> >>> You only can get things you've assigned before.
> >>>
> >>> Cheers
> >>> Per
> >>>
> >>> ---------------------------------------------------------------------
> >>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> >>> For additional commands, e-mail: users-help@wicket.apache.org
> >>>
> >>>
> >>>
> >>
> >>
> >
> >
>
> --
> View this message in context:
> http://www.nabble.com/Problem-with-Textfield-tp17170575p17179519.html
> Sent from the Wicket - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>


-- 
Okpala Ikenna N. Jr.

Re: Problem with Textfield

Posted by Jonathan Locke <jo...@gmail.com>.

if you assigned to that null field (clearly not with the code below) and you
are still getting an NPE, it could not be the /same/ error by definition.  i
suggest you slow down, get out a debugger and think this through.


kengimel wrote:
> 
> i assigned new Model() to the field.
> 
>  String sym = (String) new Model().getObject();
>                 int stockValue = sym.hashCode() % 100;
>                 QuoteResult quoteResult = new QuoteResult(stockValue);
>                 setResponsePage(quoteResult);
> 
> and it still threw the same error.
> 
> i also found some additional inform from clicking the display page view.
> 
> 
> Page
> 
>       [Page class = myapp.stockquote.GetQuoteSymbol, id = 0, version = 0]:
>       # 	Path 	Size 	Type 	Model Object
>       1    	f    	1.6K    	org.apache.wicket.markup.html.form.Form    	   
>       2    	f:sym    	813 bytes    
> org.apache.wicket.markup.html.form.TextField    	MSFT   
> 
> Jonathan Locke wrote:
>> 
>> 
>> no, the problem is more basic than that. it would work if new Model() was
>> assigned to the field.  instead it is being assigned to a local variable,
>> which goes out of scope, leaving the field still null:
>> 
>> Model model = new Model("MSFT"); 
>> 
>> if the field were final, the compiler would warn that the field was never
>> assigned.
>> 
>> 
>> Newgro wrote:
>>> 
>>> Hello Kengimel,
>>> 
>>> You do this
>>>     	private Model model;                
>>> and that
>>> 	String sym = (String) model.getObject();
>>> 
>>> but you did not 
>>> 	form.setModel(model) 
>>> or @ least 
>>> 	setModel(model)
>>> 
>>> You only can get things you've assigned before.
>>> 
>>> Cheers
>>> Per
>>> 
>>> ---------------------------------------------------------------------
>>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>>> For additional commands, e-mail: users-help@wicket.apache.org
>>> 
>>> 
>>> 
>> 
>> 
> 
> 

-- 
View this message in context: http://www.nabble.com/Problem-with-Textfield-tp17170575p17179519.html
Sent from the Wicket - User mailing list archive at Nabble.com.


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Re: Problem with Textfield

Posted by kengimel <ik...@gmail.com>.
i assigned new Model() to the field.

 String sym = (String) new Model().getObject();
                int stockValue = sym.hashCode() % 100;
                QuoteResult quoteResult = new QuoteResult(stockValue);
                setResponsePage(quoteResult);

and it still threw the same error.

i also found some additional inform from clicking the display page view.


Page

      [Page class = myapp.stockquote.GetQuoteSymbol, id = 0, version = 0]:
      # 	Path 	Size 	Type 	Model Object
      1    	f    	1.6K    	org.apache.wicket.markup.html.form.Form    	   
      2    	f:sym    	813 bytes    
org.apache.wicket.markup.html.form.TextField    	MSFT   

Jonathan Locke wrote:
> 
> 
> no, the problem is more basic than that. it would work if new Model() was
> assigned to the field.  instead it is being assigned to a local variable,
> which goes out of scope, leaving the field still null:
> 
> Model model = new Model("MSFT"); 
> 
> if the field were final, the compiler would warn that the field was never
> assigned.
> 
> 
> Newgro wrote:
>> 
>> Hello Kengimel,
>> 
>> You do this
>>     	private Model model;                
>> and that
>> 	String sym = (String) model.getObject();
>> 
>> but you did not 
>> 	form.setModel(model) 
>> or @ least 
>> 	setModel(model)
>> 
>> You only can get things you've assigned before.
>> 
>> Cheers
>> Per
>> 
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>> For additional commands, e-mail: users-help@wicket.apache.org
>> 
>> 
>> 
> 
> 

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Re: Problem with Textfield

Posted by Jonathan Locke <jo...@gmail.com>.

no, the problem is more basic than that. it would work if new Model() was
assigned to the field.  instead it is being assigned to a local variable,
which goes out of scope, leaving the field still null:

Model model = new Model("MSFT"); 

if the field were final, the compiler would warn that the field was never
assigned.


Newgro wrote:
> 
> Hello Kengimel,
> 
> You do this
>     	private Model model;                
> and that
> 	String sym = (String) model.getObject();
> 
> but you did not 
> 	form.setModel(model) 
> or @ least 
> 	setModel(model)
> 
> You only can get things you've assigned before.
> 
> Cheers
> Per
> 
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
> 
> 
> 

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Re: Problem with Textfield

Posted by Per Newgro <pe...@gmx.ch>.
Hello Kengimel,

You do this
    	private Model model;                
and that
	String sym = (String) model.getObject();

but you did not 
	form.setModel(model) 
or @ least 
	setModel(model)

You only can get things you've assigned before.

Cheers
Per

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Re: Problem with Textfield

Posted by Ikenna Okpala <ik...@googlemail.com>.
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 <jo...@gmail.com>
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
> >
>
> --
> View this message in context:
> http://www.nabble.com/Problem-with-Textfield-tp17170575p17170604.html
> Sent from the Wicket - User mailing list archive at Nabble.com.
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>


-- 
Okpala Ikenna N. Jr.

Re: Problem with Textfield

Posted by Jonathan Locke <jo...@gmail.com>.

this is one good reason, btw, to make your fields final when possible.  the
compiler would have warned you.


Jonathan Locke 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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Re: Problem with Textfield

Posted by Jonathan Locke <jo...@gmail.com>.

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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