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Posted to users@wicket.apache.org by Alberto <ab...@inogs.it> on 2020/07/14 07:06:47 UTC
Lambda expressions on StringResourceModel does not work
Hello,
I have a StringResourceModel in a parent abstract class of all pages.
IModel<String> titleModel = new StringResourceModel("contentTitle", getModel());
where "contentTitle" is a property specified for every child page in specific
property files and getModel() returns a chain of a CompoundPropertyModel and a
LoadableDetachableModel.
If I simple use it, it works:
add(new Label("pageTitle", titleModel));
But if I apply a lambda expression to it (for example):
add(new Label("pageTitle", titleModel.map(String::trim)));
I have an exception.:
java.util.MissingResourceException: Unable to find property: 'contentTitle'.
Locale: null, style: null
Why it happens?
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Re: Lambda expressions on StringResourceModel does not work
Posted by Alberto <ab...@inogs.it>.
On Tue, 2020-07-14 at 18:44 +0300, Martin Grigorov wrote:
> Hi again,
>
> On Tue, Jul 14, 2020 at 10:46 AM Martin Grigorov <mg...@apache.org>
> wrote:
>
> > Hi,
> >
> > On Tue, Jul 14, 2020 at 10:10 AM Alberto <ab...@inogs.it> wrote:
> >
> > > Hello,
> > >
> > > I have a StringResourceModel in a parent abstract class of all pages.
> > >
> > > IModel<String> titleModel = new StringResourceModel("contentTitle",
> > > getModel());
> > >
> > > where "contentTitle" is a property specified for every child page in
> > > specific
> > > property files and getModel() returns a chain of a CompoundPropertyModel
> > > and a
> > > LoadableDetachableModel.
> > >
> > > If I simple use it, it works:
> > >
> > > add(new Label("pageTitle", titleModel));
> > >
> > >
> > > But if I apply a lambda expression to it (for example):
> > >
> > > add(new Label("pageTitle", titleModel.map(String::trim)));
> > >
> > > I have an exception.:
> > >
> > > java.util.MissingResourceException: Unable to find property:
> > > 'contentTitle'.
> > > Locale: null, style: null
> > >
> > >
> > > Why it happens?
> > >
> >
> > Because .map() returns a new IModel that does not
> > implement IComponentAssignedModel and Wicket cannot find the property in
> > the visible resource bundles.
> > I.e. your properties are in MyPage.properties and Wicket does not look
> > into them because the model does not know the Component it is assigned to.
> > If the property is in MyApplication.properties then it will work, because
> > this is not related to specific Component.
> >
> > Please file a ticket in JIRA. I think this could be improved.
> >
>
> I just took a look at your ticket (
> https://issues.apache.org/jira/browse/WICKET-6801) and it is not exactly as
> I thought it is.
>
> add(new Label("pageTitle", titleModel.map(String::trim)));
>
> at this line titleModel doesn't yet know its component because at the time
> IModel#map() is called titleModel is not yet added as a model to the Label
> and thus IComponentAssignedModel is not yet involved.
> The new IModel returned by .map() does not implement
> IComponentAssignedModel and thus it cannot delegate the
> #wrapOnAssignment(Component) call.
>
> The good news for you is that you can use IModel<String> titleModel = new
> StringResourceModel("contentTitle", *this*, getModel()); to solve your
> problem. By passing 'this' as parameter you tell StringResourceModel to use
> it instead of depending on
> the Component it is added to (the Label in this case).
>
> I'll see what I can do for WICKET-6801!
>
>
Yes, you are right.
I should have read better the documentation. Sorry for that.
Thanks
A
> >
> > >
> > >
> > >
> > > ---------------------------------------------------------------------
> > > To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> > > For additional commands, e-mail: users-help@wicket.apache.org
> > >
> > >
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Re: Lambda expressions on StringResourceModel does not work
Posted by Martin Grigorov <mg...@apache.org>.
Hi again,
On Tue, Jul 14, 2020 at 10:46 AM Martin Grigorov <mg...@apache.org>
wrote:
> Hi,
>
> On Tue, Jul 14, 2020 at 10:10 AM Alberto <ab...@inogs.it> wrote:
>
>>
>> Hello,
>>
>> I have a StringResourceModel in a parent abstract class of all pages.
>>
>> IModel<String> titleModel = new StringResourceModel("contentTitle",
>> getModel());
>>
>> where "contentTitle" is a property specified for every child page in
>> specific
>> property files and getModel() returns a chain of a CompoundPropertyModel
>> and a
>> LoadableDetachableModel.
>>
>> If I simple use it, it works:
>>
>> add(new Label("pageTitle", titleModel));
>>
>>
>> But if I apply a lambda expression to it (for example):
>>
>> add(new Label("pageTitle", titleModel.map(String::trim)));
>>
>> I have an exception.:
>>
>> java.util.MissingResourceException: Unable to find property:
>> 'contentTitle'.
>> Locale: null, style: null
>>
>>
>> Why it happens?
>>
>
> Because .map() returns a new IModel that does not
> implement IComponentAssignedModel and Wicket cannot find the property in
> the visible resource bundles.
> I.e. your properties are in MyPage.properties and Wicket does not look
> into them because the model does not know the Component it is assigned to.
> If the property is in MyApplication.properties then it will work, because
> this is not related to specific Component.
>
> Please file a ticket in JIRA. I think this could be improved.
>
I just took a look at your ticket (
https://issues.apache.org/jira/browse/WICKET-6801) and it is not exactly as
I thought it is.
add(new Label("pageTitle", titleModel.map(String::trim)));
at this line titleModel doesn't yet know its component because at the time
IModel#map() is called titleModel is not yet added as a model to the Label
and thus IComponentAssignedModel is not yet involved.
The new IModel returned by .map() does not implement
IComponentAssignedModel and thus it cannot delegate the
#wrapOnAssignment(Component) call.
The good news for you is that you can use IModel<String> titleModel = new
StringResourceModel("contentTitle", *this*, getModel()); to solve your
problem. By passing 'this' as parameter you tell StringResourceModel to use
it instead of depending on
the Component it is added to (the Label in this case).
I'll see what I can do for WICKET-6801!
>
>
>>
>>
>>
>>
>> ---------------------------------------------------------------------
>> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
>> For additional commands, e-mail: users-help@wicket.apache.org
>>
>>
Re: Lambda expressions on StringResourceModel does not work
Posted by Martin Grigorov <mg...@apache.org>.
Hi,
On Tue, Jul 14, 2020 at 10:10 AM Alberto <ab...@inogs.it> wrote:
>
> Hello,
>
> I have a StringResourceModel in a parent abstract class of all pages.
>
> IModel<String> titleModel = new StringResourceModel("contentTitle",
> getModel());
>
> where "contentTitle" is a property specified for every child page in
> specific
> property files and getModel() returns a chain of a CompoundPropertyModel
> and a
> LoadableDetachableModel.
>
> If I simple use it, it works:
>
> add(new Label("pageTitle", titleModel));
>
>
> But if I apply a lambda expression to it (for example):
>
> add(new Label("pageTitle", titleModel.map(String::trim)));
>
> I have an exception.:
>
> java.util.MissingResourceException: Unable to find property:
> 'contentTitle'.
> Locale: null, style: null
>
>
> Why it happens?
>
Because .map() returns a new IModel that does not
implement IComponentAssignedModel and Wicket cannot find the property in
the visible resource bundles.
I.e. your properties are in MyPage.properties and Wicket does not look into
them because the model does not know the Component it is assigned to.
If the property is in MyApplication.properties then it will work, because
this is not related to specific Component.
Please file a ticket in JIRA. I think this could be improved.
>
>
>
>
> ---------------------------------------------------------------------
> To unsubscribe, e-mail: users-unsubscribe@wicket.apache.org
> For additional commands, e-mail: users-help@wicket.apache.org
>
>