Hi,
The new member registration works now in Spiral 12 (urls12). The update
is on the Web:
Spiral 12 introduction::
http://drdb.fsa.ulaval.ca/urls/web/spirals/spiral12/index.html
Spiral 12 in action:
http://drdb.fsa.ulaval.ca/urls12/app
Spiral 12 zip file:
http://drdb.fsa.ulaval.ca/urls/web/zip/urls12.zip
I have redesigned the NewMemberClass by not reusing MemberAddForm
(private class NewMemberForm extends MemberForm) and by dropping
Observer/Observable (the next page is now in the onSubmit method of
NewMemberForm).
I still do not get why the first does not work, while the second does:
1. setResponsePage(new CategoriesPage()); // NullPointerException in edit
2. Page categoriesPage = new CategoriesPage();
categoriesPage.onRedirect();
If there was a null pointer exception in the default constructor of
CategoriesPage, it would be caught in 2. too.
I have complete listings of setResponsePage errors in the doc directory
of urls12/doc (in .txt files).
A part of the error listing for Category edit:
wicket.WicketRuntimeException: Method public abstract void
wicket.markup.html.form.IFormSubmitListener.onFormSubmitted() of
interface java.lang.reflect.Method threw an exception
at
wicket.protocol.http.WebRequestCycle.invokeInterface(WebRequestCycle.java:506)
Caused by: java.lang.NullPointerException
at wicket.Component.setResponsePage(Component.java:1214)
at
org.wicket.urls.app.view.category.CategoriesPage.update(CategoriesPage.java:153)
at java.util.Observable.notifyObservers(Observable.java:142)
at org.dzenanr.model.Entities.notifyObservers(Entities.java:795)
at org.dzenanr.model.Entities.update(Entities.java:526)
at
org.wicket.urls.app.view.category.CategoryEditForm.onSubmit(CategoryEditForm.java:50)
at wicket.markup.html.form.Form.delegateSubmit(Form.java:428)
at wicket.markup.html.form.Form.process(Form.java:380)
at wicket.markup.html.form.Form.onFormSubmitted(Form.java:212)
My avoidance of the error::
// setResponsePage(new CategoriesPage()); // NullPointerException
in edit
Page categoriesPage = new CategoriesPage();
categoriesPage.onRedirect();
It seems to me that the cause of errors might be my use of
Observer/Observable for handling the next page. In the onSubmit method
of a form I update the model that is observed by web pages. In a web
page, in the update method I save the model changes to a file and then
use setResponsePage (that is now in some pages replaced by onRedirect;
in other pages I have not hit the problem yet). To restrain
Observer/Observable, in the update method the first thing I do is delete
an observer. An example of the update method in MembersPage:
public void update(Observable o, Object arg) {
if (o instanceof Members) {
members.deleteObserver(this);
UrlsApp app = (UrlsApp) getApplication();
Members entryMembers = app.getUrlsDb().getMembers();
entryMembers.save();
//setResponsePage(new MembersPage()); // NullPointerException
?!
Page membersPage = new MembersPage();
membersPage.onRedirect();
}
}
Dzenan
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