This is really sounding like something unrelated to Tapestry, and there
isn't enough code presented to tell.
Do you have proof that your code works outside of Tapestry? Why, and how,
did you EXTEND TreeMap? Do you have a unit test to prove that your MyMap
works?
If you can present a non-Tapestry test that works, and corresponding
Tapestry test that doesn't, then I think you'll find an answer quickly.
Jonathan
> -----Original Message-----
> From: Alec Leamas [mailto:[EMAIL PROTECTED]
> Sent: Tuesday, April 01, 2008 8:37 AM
> To: Tapestry users
> Subject: Re: T5, newbie: Component parameter passing problems
>
> public List<MyMap> getRows() {...}
>
> Davor Hrg wrote:
> > how is getRows declared in your page class ?
> >
> >
> >
> >
> > On Tue, Apr 1, 2008 at 2:09 PM, Michael Kolmodin <[EMAIL PROTECTED]>
> > wrote:
> >
> >
> >> OK, thanks...
> >>
> >> In my page, I have <t:myComponent columns="prop:columns"
> >> rows="prop:rows"/>
> >>
> >> The columns argument, a List<String> is just fine.
> >> The rows argument, a List<MyMap> is the problem.
> >>
> >> The page has a List<MyMap> getRows() which is verified.
> >>
> >> Looking in MyComponent.java, I have
> >>
> >> @Parameter
> >> private List<MyMap> rows;
> >>
> >> @Parameter
> >> private List<String> columns;
> >>
> >> public String getSomethingStrange()
> >> {
> >> return rows.get(0).get( "mail" );
> >> }
> >>
> >> The latter getter fails. The debug info is from a breakpoint inside
> this
> >> method. The error I get is a classcast error "java.lang.String cannot
> be
> >> cast to ...MyMap" If I change the index to 1, there an error "Caused
> >> by: Index: 1, Size: 1" i. e., index out of bounds.
> >>
> >> Davor Hrg wrote:
> >>
> >>> Tapestry support for Java generics is very limited,
> >>> you need a value encoder to make this work,
> >>>
> >>> also, add more details on who calls what... so more is known
> >>> of the problem you are trying to solve.
> >>>
> >>>
> >>> Davor Hrg
> >>>
> >>> On Tue, Apr 1, 2008 at 1:43 PM, Alec Leamas <[EMAIL PROTECTED]>
> >>>
> >> wrote:
> >>
> >>>> I have problems passing my own datatype(s) to my own component. The
> >>>> component takes two parameters, one List<String> and one List<MyMap>.
> >>>> MyMap is declared as MyMap extends TreeMap {...}.
> >>>>
> >>>> The first parameter, a list of strings arrives safely to my
> component.
> >>>> However, the other one, seems to be mixed up: when I try to access an
> >>>> element in my List<MyMap>, it turns out that Tapestry (nothing else
> >>>> involved) have filled this list with String items, not the expected
> >>>> MyMap items. In the end, there is a class cast exception when trying
> to
> >>>> access the MyMap items as Maps.
> >>>>
> >>>> In the Eclipse debugger, it seems that the value of the List<MyMap>
> >>>> instance variable is a single string holding what looks like the
> >>>> serialized value of my List<MyMap> list. The start is
> >>>> "[{key=value,key=value...
> >>>>
> >>>> I've tried to contribute coercions between MyMap<->Map, but this
> desn't
> >>>> seem to help (?).
> >>>>
> >>>> Basically, I'm stucked unless I write everything in several big pages
> >>>> with duplicated code. Don't really want to do that. :-(
> >>>>
> >>>> Any hints out there?
> >>>>
> >>>> --alec
> >>>>
> >>>> PS Version: 5.0.11 DS
> >>>>
> >>>> ---------------------------------------------------------------------
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> >>>> For additional commands, e-mail: [EMAIL PROTECTED]
> >>>>
> >>>>
> >>>>
> >> --
> >> -----------------------------------------------------------------------
> ---
> >> Michael Kolmodin Fredsgatan 2
> >> Phone: +46 920 269413 S-972 35 Lulea
> >> Mobile +46 70 551 6507 Sweden
> >>
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> >>
> >>
> >>
> >
> >
>
>
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