It'd obviously be very helpful to have a more specific exception
message...it was so obvious I looked right over it (and I'm still
getting familiar w/ models.)
What I had done is copied some code where I was using a detachable
model...and just changed it to a regular model...that's where load()
came from...
On 4/12/06, Gwyn Evans <[EMAIL PROTECTED]> wrote:
> The current equivalent is line 305, i.e.
>
> protected void onComponentTagBody(final MarkupStream markupStream,
> final ComponentTag openTag)
> {
> List choices = getChoices();
> final AppendingStringBuffer buffer = new
> AppendingStringBuffer((choices.size() * 50) + 16);
>
> getChoices() is returning null there, as the model is empty and the
> choices.size() causes the NPE.
>
> Leaving aside the use of 'magic' numbers, should we do something
> explict there, i.e. log something & then use Collections.EMPTY_LIST,
> or even throw a NPE with an explicit message?
>
> /Gwyn
>
>
> On 12/04/06, Johan Compagner <[EMAIL PROTECTED]> wrote:
> > if you change that strange load method to what i and gwyn are saying does it
> > work then
> > what wicket version are you using because if i look at 290 of AbstractChoice
> > it is nothing.
> >
> >
> >
> > On 4/12/06, Vincent Jenks <[EMAIL PROTECTED]> wrote:
> > > OK, I did this exactly how you showed me here...and I'm still getting the
> > error.
> > >
> > > Here's my model:
> > >
> > > IModel dropDownModel = new Model()
> > > {
> > > protected Object load()
> > > {
> > > return new
> > > ArrayList<String>(StringValues.getUSAStates().keySet()); //via proxy
> > > }
> > > };
> > >
> > > Here's my dropdown:
> > >
> > > add(new DropDownChoice("billingState",
> > dropDownModel, new IChoiceRenderer()
> > > {
> > > public String
> > getDisplayValue(Object object)
> > > {
> > > return
> > StringValues.getUSAStates().get(object);
> > > }
> > >
> > > public String
> > getIdValue(Object object, int index)
> > > {
> > > return
> > object.toString();
> > > }
> > > }));
> > >
> > > Here's the exception:
> > >
> > > 13:00:19,000 ERROR [RequestCycle] Unexpected runtime exception [page =
> > > [Page class = com.myapp.ui.AddressInfo, id = 3]]
> > > java.lang.NullPointerException
> > > at
> > wicket.markup.html.form.AbstractChoice.onComponentTagBody(AbstractChoice.java:290)
> > > at wicket.Component.renderComponent
> > (Component.java:1888)
> > > at
> > wicket.markup.html.WebMarkupContainer.onRender(WebMarkupContainer.java:77)
> > > at wicket.Component.render(Component.java:1163)
> > > at
> > wicket.MarkupContainer.renderNext(MarkupContainer.java
> > :1136)
> > > at
> > wicket.MarkupContainer.renderComponentTagBody(MarkupContainer.java:811)
> > > at
> > wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:753)
> > > at wicket.Component.renderComponent
> > (Component.java:1888)
> > > at
> > wicket.markup.html.WebMarkupContainer.onRender(WebMarkupContainer.java:77)
> > > at
> > wicket.markup.html.form.Form.onRender(Form.java:517)
> > > at wicket.Component.render(Component.java :1163)
> > > at
> > wicket.markup.html.BodyOnLoadContainer.resolve(BodyOnLoadContainer.java:106)
> > > at
> > wicket.MarkupContainer.renderNext(MarkupContainer.java:1159)
> > > at wicket.MarkupContainer.renderComponentTagBody
> > (MarkupContainer.java:811)
> > > at
> > wicket.MarkupContainer.onComponentTagBody(MarkupContainer.java:753)
> > > at
> > wicket.Component.renderComponent(Component.java:1888)
> > > at wicket.markup.html.WebMarkupContainer.onRender
> > (WebMarkupContainer.java:77)
> > > at wicket.Component.render(Component.java:1163)
> > > at wicket.MarkupContainer.autoAdd(MarkupContainer.java:170)
> > > at
> > wicket.markup.html.BodyOnLoadResolver.resolve(BodyOnLoadResolver.java
> > :60)
> > > at
> > wicket.MarkupContainer.renderNext(MarkupContainer.java:1146)
> > > at
> > wicket.MarkupContainer.renderAll(MarkupContainer.java:779)
> > > at wicket.Page.onRender(Page.java:788)
> > > at wicket.Component.render (Component.java:1163)
> > > at wicket.Page.doRender(Page.java:251)
> > > at
> > wicket.protocol.http.WebRequestCycle.redirectTo(WebRequestCycle.java:276)
> > > at wicket.RequestCycle.respond(RequestCycle.java:934)
> > > at wicket.RequestCycle.request(RequestCycle.java:411)
> > > at
> > wicket.protocol.http.WicketServlet.doGet(WicketServlet.java:208)
> > > at
> > wicket.protocol.http.WicketServlet.doPost(WicketServlet.java:234)
> > > ..........
> > >
> > > It's definitely the dropdown that is the culprit...when I remove it
> > > from the page the
> > > page renders just fine.
> > >
> > > Any ideas?
> > >
> > > On 4/10/06, Johan Compagner < [EMAIL PROTECTED]> wrote:
> > > > ok then youre dropdown is wrong.
> > > >
> > > > IModel dropDownModel = new Model()
> > > > {
> > > > public Object getObject(final Component component)
> > > > {
> > > > return new
> > > > ArrayList(StringValues.getUSAStates().keySet()); //via proxy
> > > > }
> > > > };
> > > >
> > > >
> > > > add(new DropDownChoice("billingState", dropDownModel, new
> > IChoiceRenderer()
> > > > {
> > > > public String getDisplayValue(Object object)
> > > > {
> > > >
> > > > return StringValues.getUSAStates().get(object);
> > > >
> > > >
> > > > }
> > > >
> > > > public String getIdValue(Object object, int index)
> > > > {
> > > > return object.toString();
> > > > }
> > > > }));
> > > >
> > > > I haven't seen many usecases for that because most of the time
> > > > You have a List of States so getUSAStates doesn't return a map but
> > directly
> > > > a list.
> > > > With State objects that has properties like: a key "AL" and as name
> > > > "Alabama".
> > > >
> > > > That is the most used usecase i know of.
> > > >
> > > > johan
> > > >
> > > >
> > > >
> > > > On 4/11/06, Vincent Jenks <[EMAIL PROTECTED] > wrote:
> > > > >
> > > > > I'm sorry, I don't think I quite understand.
> > > > >
> > > > > I have dropDownModel which looks like this:
> > > > >
> > > > >
> > > > > IModel dropDownModel = new Model()
> > > > > {
> > > > > protected Object load()
> > > > > {
> > > > >
> > > > > return StringValues.getUSAStates(); //via proxy
> > > > > }
> > > > > };
> > > > >
> > > > > StringValues.getUSAStates() looks something like this:
> > > > >
> > > > > public static Map<String, String> getUSAStates()
> > > > > {
> > > > > Map<String, String> states = new HashMap<String, String>();
> > > > > states.put("AL", "Alabama");
> > > > > states.put("AK", "Alaska");
> > > > > states.put("AZ", "Arizona");
> > > > > states.put("AR", "Arkansas");
> > > > > states.put("CA", "California");
> > > > > ......
> > > > >
> > > > > Where "CA" is the key and "California" is the value...which is exactly
> > how
> > > > I'd like to see it in the select dropdown.
> > > > >
> > > > > Are you saying that I should split the keys and values into two
> > different
> > > > lists and look them up that way?
> > > > >
> > > > > It would be extremely useful, in my opinion, if Wicket had support for
> > > > these types of objects internally, given the frequency of which they're
> > > > used. It would be very intuitive if I could supply key/value Map
> > objects
> > > > into what is essentially a list of key/value pairs.
> > > > >
> > > > > Thanks again...
> > > > >
> > > > >
> > > > >
> > > > > On 4/10/06, Johan Compagner < [EMAIL PROTECTED]> wrote:
> > > > > >
> > > > > > give the choice renderen the complete hashmap
> > > > > >
> > > > > > And give the dropdown a model with the keys of that hashmap as a
> > list.
> > > > > >
> > > > > > so if StringValues.getUSAStates (); are th ids in the hashmap then
> > that
> > > > should go ok.
> > > > > >
> > > > > > but youre choicerender is wrong:
> > > > > >
> > > > > >
> > > > > > add(new DropDownChoice("billingState", dropDownModel, new
> > > > IChoiceRenderer()
> > > > > > {
> > > > > > public String getDisplayValue(Object object)
> > > > > > {
> > > > > >
> > > > > > return idValueHashmap.get(object);
> > > > > >
> > > > > > }
> > > > > >
> > > > > > public String getIdValue(Object object, int index)
> > > > > > {
> > > > > > return object.toString();
> > > > > > }
> > > > > > }));
> > > > > >
> > > > > >
> > > > > >
> > > > > > On 4/11/06, Vincent Jenks < [EMAIL PROTECTED]> wrote:
> > > > > > >
> > > > > > > Is there an example of this somewhere? I'm struggling to get this
> > > > working where I have a HashMap<String, String>...the first String is the
> > ID
> > > > and the second String is the value.
> > > > > > >
> > > > > > > I have this:
> > > > > > > IModel dropDownModel = new Model()
> > > > > > > {
> > > > > > > protected Object load()
> > > > > > > {
> > > > > > > return StringValues.getUSAStates();
> > > > > > > }
> > > > > > > };
> > > > > > >
> > > > > > > add(new DropDownChoice("billingState", dropDownModel,
> > new
> > > > IChoiceRenderer()
> > > > > > > {
> > > > > > > public String getDisplayValue(Object object)
> > > > > > > {
> > > > > > > return object.toString();
> > > > > > > }
> > > > > > >
> > > > > > > public String getIdValue(Object object, int index)
> > > > > > > {
> > > > > > > return object.toString();
> > > > > > > }
> > > > > > > }));
> > > > > > >
> > > > > > > I *just* wanted to see the page render...I know the values aren't
> > > > right...but anything would have been acceptable. I keep getting a very
> > > > unhelpful NullPointerException that I'm not even sure has anything to do
> > w/
> > > > the dropdowns...but I assume it does since the rest of the form is very
> > > > straightforward TextField components.
> > > > > > >
> > > > > > > I don't see where this is being done in wicket-examples....I'm
> > using
> > > > 1.1.1
> > > > > > >
> > > > > > > Thanks!
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > > > On 4/1/06, Johan Compagner < [EMAIL PROTECTED]> wrote:
> > > > > > >
> > > > > > > >
> > > > > > > > there is no map support for this.
> > > > > > > >
> > > > > > > > What you could do is give the map to the ChoiceRenderer impl
> > > > > > > > and give the keys of the map as a list to the Choice.
> > > > > > > >
> > > > > > > >
> > > > > > > > johan
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > > > On 3/31/06, Vincent Jenks < [EMAIL PROTECTED]> wrote:
> > > > > > > > >
> > > > > > > > > I'm trying to get a Map of data so I can have the key be the
> > value
> > > > of the dropdown options and the value of the Map item be the value of
> > the
> > > > option in the dropdown. Problem is, it doesn't look like DropDownChoice
> > > > will accept a Map...unless I'm doing it wrong?
> > > > > > > > >
> > > > > > > > > Is a Map the best way to go? I was maybe considering using a
> > > > single List collection and splitting a single string to get the two
> > > > values....but that's pretty fugly too.
> > > > > > > > >
> > > > > > > >
> > > > > > > >
> > > > > > >
> > > > > > >
> > > > > > >
> > > > > >
> > > > > >
> > > > >
> > > > >
> > > >
> > > >
> > >
> > >
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