Ok, I might be doing something thats not ok but ..... there are not
two ListViews on this page (there are 3 forms? Is this a problem?)
ClassCastException is throw at System.out.println("++++")
package com.musmato.wicket.pages.templates;
import java.util.Arrays;
import org.apache.wicket.markup.html.form.DropDownChoice;
import org.apache.wicket.markup.html.form.Form;
import org.apache.wicket.markup.html.form.RequiredTextField;
import org.apache.wicket.markup.html.form.TextArea;
import org.apache.wicket.markup.html.link.Link;
import org.apache.wicket.markup.html.list.ListItem;
import org.apache.wicket.markup.html.list.ListView;
import org.apache.wicket.model.CompoundPropertyModel;
import com.musmato.model.QuestionAndAnswer;
import com.musmato.model.Role;
import com.musmato.model.Template;
import com.musmato.model.WebControlType;
import com.musmato.wicket.model.QuestionAndAnswerWebModel;
import com.musmato.wicket.model.TemplateWebModel;
import com.musmato.wicket.pages.AuthPage;
import com.musmato.wicket.util.WicketApplication;
public class TemplateEditPage extends AuthPage {
public TemplateEditPage(TemplateWebModel templatemodel) {
add(new TemplateEditForm("templateeditform", templatemodel));
add(new QuestionAddForm("questionaddform", templatemodel));
add(new QuestionEditForm("questioneditform", templatemodel));
}
@Override
public Role[] getAllowedRoles() {
// TODO Auto-generated method stub
return null;
}
private class TemplateEditForm extends Form {
private final Template template;
public TemplateEditForm(String id, TemplateWebModel
templatemodel) {
super(id);
template = (Template) templatemodel.getObject();
setModel(new CompoundPropertyModel(templatemodel));
add(new RequiredTextField("name"));
add(new RequiredTextField("version"));
add(new TextArea("description"));
}
@Override
public void onSubmit() {
WicketApplication.get().getTemplateFactory().store(template);
setResponsePage(new TemplateEditPage(new
TemplateWebModel(template)));
}
}
private class QuestionAddForm extends Form {
private final Template template;
public QuestionAddForm(String id, TemplateWebModel
templatemodel) {
super(id);
template = (Template) templatemodel.getObject();
setModel(new CompoundPropertyModel(new
QuestionAndAnswerWebModel(
(Long) null)));
add(new RequiredTextField("question"));
add(new DropDownChoice("type",
Arrays.asList(WebControlType
.values())));
}
@Override
public void onSubmit() {
QuestionAndAnswer qanda = (QuestionAndAnswer) getModel()
.getObject();
template.addQuestion(qanda);
WicketApplication.get().getTemplateFactory().store(template);
setResponsePage(new TemplateEditPage(new
TemplateWebModel(template)));
}
}
private class QuestionEditForm extends Form {
private Template template;
public QuestionEditForm(String id, TemplateWebModel
templatemodel) {
super(id);
template = (Template) templatemodel.getObject();
ListView questionlist = new ListView("questions",
template
.getQuestions()) {
@Override
protected void populateItem(ListItem item) {
System.out.println("+++++++"
+
item.getModelObject().getClass().getName());
final QuestionAndAnswer qanda =
(QuestionAndAnswer) item
.getModelObject();
setModel(new
CompoundPropertyModel(qanda));
item.add(new
RequiredTextField("question"));
item.add(new DropDownChoice("type",
Arrays
.asList(WebControlType.values())));
item.add(new Link("delete") {
@Override
public void onClick() {
template.delQuestion(qanda);
setResponsePage(new
TemplateEditPage(
new
TemplateWebModel(template)));
}
});
}
};
add(questionlist);
}
@Override
public void onSubmit() {
WicketApplication.get().getTemplateFactory().store(template);
setResponsePage(new TemplateEditPage(new
TemplateWebModel(template)));
}
}
}
On Oct 23, 2008, at 12:04 PM, Martijn Dashorst wrote:
The classcastexception happens on retrieving the N-th item from the
list. The class cast tries to cast the model object of the listview to
a List. Apparently the argument to the listview is not a List, but
somethign that returns a QuestionAndAnswer.
Are you looking at the correct ListView (i.e. are there more ListView
s on your page)?
Martijn
On Thu, Oct 23, 2008 at 11:55 AM, Dipu <[EMAIL PROTECTED]>
wrote:
pass , sorry i have no clue
On Thu, Oct 23, 2008 at 10:37 AM, pieter claassen <[EMAIL PROTECTED]
>wrote:
Ok, I added;
public class Debug {
public static void debug(List list) {
for (Object item : list) {
System.out.println("++DEBUG++: " +
item.getClass().toString());
}
}
and called debug just before I returned my ArrayList of question:
public ArrayList<QuestionAndAnswer> getQuestions() {
Debug.debug(questions);
return questions;
}
This is what I saw in my console. There are two objects in the
list and
they are both QuestionAndAnswer objects
++DEBUG++: class com.musmato.model.QuestionAndAnswer
++DEBUG++: class com.musmato.model.QuestionAndAnswer
Regards,
Pieter
On Oct 23, 2008, at 11:18 AM, Dipu wrote:
can't you check what exactly is being returned by
template.getQuestions()
and if its a list what are the items in it
On Thu, Oct 23, 2008 at 10:10 AM, pieter claassen <[EMAIL PROTECTED]
wrote:
Hi Dipu,
I tried that but when I do the following:
protected void populateItem(ListItem item) {
System.out.println("+++++++" +
item.getModelObject().getClass().getName());
final QuestionAndAnswer qanda =
(QuestionAndAnswer)
item.getModelObject();
I find that I now get the ClassCastException in the
System.out.println
line. It is clear as mud that the problem is that I am trying to
force
something into a list which is not a list?
Regards,
Pieter
On Oct 23, 2008, at 10:59 AM, Dipu wrote:
looks like template.getQuestions() is returning a list with
items in it
which is not of the type QuestionAndAnswer
try iterating through the list and logging the class name of
each item
in
it
Dipu
On Thu, Oct 23, 2008 at 9:46 AM, pieter claassen <[EMAIL PROTECTED]
wrote:
I am getting a classcast exception in ListView that is stumping
me.
This is the error message (top few lines)
WicketMessage: Error attaching this container for rendering:
[MarkupContainer [Component id = questioneditform]]
Root cause:
java.lang.ClassCastException:
com.musmato.model.QuestionAndAnswer
at
org
.apache
.wicket
.markup.html.list.ListItemModel.getObject(ListItemModel.java:55)
at org.apache.wicket.Component.getModelObject(Component.java:
1558)
at
com.musmato.wicket.pages.templates.TemplateEditPage
$QuestionEditForm$1.populateItem(TemplateEditPage.java:93)
This is the code that generates my ListItems:
ListView questions = new ListView("questions",
template
.getQuestions()) {
@Override
protected void populateItem(ListItem
item) {
final QuestionAndAnswer
qanda =
(QuestionAndAnswer) item
.getModelObject
();
setModel(new
CompoundPropertyModel(qanda));
I know for a fact that template.getQuestions() produces an
ArrayList.
The arraylist works when there is only 1 item in it but when I
have
more
than 1 item, it fails with the ClassCastException. Is this a
wicket
problem
or am I doing something wrong?
Regards,
Pieter
pieter claassen
[EMAIL PROTECTED]
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