DropDownChoice without Model throws RE in onSelectionChanged
------------------------------------------------------------
Key: WICKET-1300
URL: https://issues.apache.org/jira/browse/WICKET-1300
Project: Wicket
Issue Type: Bug
Components: wicket
Affects Versions: 1.3.0-rc1
Reporter: Adriaan Koster
Priority: Minor
When I create a DropDownChoice using the constructor as advocated in the Wicket
API I get a RuntimeException when I try to handle onSelectionChanged events.
>From http://people.apache.org/~tobrien/wicket/apidocs/index.html:
List SITES = Arrays.asList(new String[] { "The Server Side", "Java Lobby",
"Java.Net" });
form.add(new DropDownChoice("site", SITES));
My code throwing exception:
List<Performance> performances = eventDao.listPerformances();
// broken:
DropDownChoice pickPerformance = new DropDownChoice("pickPerformance",
performances)
// workaround: new DropDownChoice("pickPerformance", new Model(null),
performances)
{
protected boolean wantOnSelectionChangedNotifications() {
return true;
}
@Override
protected void onSelectionChanged(Object newSelection) {
Performance event = (Performance) newSelection;
}
};
add(pickPerformance);
Output:
14:23:10,968 ERROR RequestCycle.logRuntimeException:1331 - [PoolThread-9]
Method onSelectionChanged of interface
org.apache.wicket.markup.html.form.IOnChangeListener targeted at component
[MarkupContainer [Component id = pickPerformance, page =
nl.topticketline.freeline.ui.ViewReservation, path =
1:pickPerformance.ViewReservation$3, isVisible = true, isVersioned = false]]
threw an exception
org.apache.wicket.WicketRuntimeException: Method onSelectionChanged of
interface org.apache.wicket.markup.html.form.IOnChangeListener targeted at
component [MarkupContainer [Component id = pickPerformance, page =
nl.topticketline.freeline.ui.ViewReservation, path =
1:pickPerformance.ViewReservation$3, isVisible = true, isVersioned = false]]
threw an exception
at
org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:194)
at
org.apache.wicket.request.target.component.listener.ListenerInterfaceRequestTarget.processEvents(ListenerInterfaceRequestTarget.java:73)
at
org.apache.wicket.request.AbstractRequestCycleProcessor.processEvents(AbstractRequestCycleProcessor.java:90)
at
org.apache.wicket.RequestCycle.processEventsAndRespond(RequestCycle.java:1094)
at org.apache.wicket.RequestCycle.step(RequestCycle.java:1169)
at org.apache.wicket.RequestCycle.steps(RequestCycle.java:1248)
at org.apache.wicket.RequestCycle.request(RequestCycle.java:489)
at
org.apache.wicket.protocol.http.WicketFilter.doGet(WicketFilter.java:343)
at
org.apache.wicket.protocol.http.WicketFilter.doFilter(WicketFilter.java:193)
at
org.mortbay.jetty.servlet.WebApplicationHandler$Chain.doFilter(WebApplicationHandler.java:334)
at
org.mortbay.jetty.servlet.WebApplicationHandler.dispatch(WebApplicationHandler.java:286)
at
org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:567)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1723)
at
org.mortbay.jetty.servlet.WebApplicationContext.handle(WebApplicationContext.java:514)
at org.mortbay.http.HttpContext.handle(HttpContext.java:1673)
at org.mortbay.http.HttpServer.service(HttpServer.java:879)
at org.mortbay.http.HttpConnection.service(HttpConnection.java:783)
at org.mortbay.http.HttpConnection.handleNext(HttpConnection.java:945)
at org.mortbay.http.HttpConnection.handle(HttpConnection.java:800)
at
org.mortbay.http.SocketListener.handleConnection(SocketListener.java:201)
at org.mortbay.util.ThreadedServer.handle(ThreadedServer.java:289)
at org.mortbay.util.ThreadPool$PoolThread.run(ThreadPool.java:454)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at
org.apache.wicket.RequestListenerInterface.invoke(RequestListenerInterface.java:183)
... 21 more
Caused by: java.lang.IllegalStateException: Attempt to set model object on null
model of component: pickPerformance
at org.apache.wicket.Component.setModelObject(Component.java:2794)
at
org.apache.wicket.markup.html.form.FormComponent.updateModel(FormComponent.java:992)
at
org.apache.wicket.markup.html.form.DropDownChoice.onSelectionChanged(DropDownChoice.java:152)
... 26 more
It works fine when I use the constructor below which also passes in a Model:
new DropDownChoice("pickPerformance", new Model(null), performances)
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