Hi,
double check that the boolean is not primitive _anywhere_, as then assigning
null to it would coerse the value to false witch is the default in Java if
it is unknown.
The other option is that the type coersion system in T5 handles null values
incorrectly?
- Ville
Łukasz Jazgar wrote:
>
>
> Hi all,
>
> I am a newbie in Tapestry. Please, help me to understand, how binding of
> parameters works. I'll show my problem on very simplified example.
>
> There is a component:
>
> public class BooleanComponent {
>
> @Parameter
> private Boolean value;
>
> boolean beginRender(MarkupWriter writer) {
> writer.write(""+value);
> return false;
> }
> }
>
> Component has one parameter of type Boolean, and all what component does
> is rendering value of this parameter.
>
> This component is placed on Page:
> BooleanTestPage.tml:
> <html xmlns="http://www.w3.org/1999/xhtml";
> xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance";
> xmlns:t="http://tapestry.apache.org/schema/tapestry_5_0_0.xsd";
> xsi:schemaLocation="http://www.w3.org/2001/XMLSchema-instance
> http://www.w3.org/MarkUp/SCHEMA/xhtml11.xsd";
> >
>
> <body>
> PageProperty: ${boolProperty} <br/>
> BooleanComponent: <t:booleanComponent t:value="boolProperty"/>
> </body>
> </html>
>
> BooleanTestPage.java:
> public class BooleanTestPage {
> @Property
> private Boolean boolProperty;
>
> void onActivate(String yesNoNullStr) {
> if (yesNoNullStr.equalsIgnoreCase("yes"))
> boolProperty = true;
> else if (yesNoNullStr.equalsIgnoreCase("no"))
> boolProperty = false;
> else
> boolProperty = null;
> }
> }
>
> Page has property of type Boolean passed to component by parameter.
>
> When I show the page with parameter "yes" or "no", everything goes
> according to my expectations. Property of page and parameter of
> component are binded, so they have same value, true or false.
>
> But, when I show page with any other value, property of page gets null
> value, but parameter of component gets false, not null. Why?
> What am I doing wrong?
>
>
> Regards
> Lukasz
>
>
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