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https://issues.apache.org/jira/browse/TAP5-595?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Howard M. Lewis Ship closed TAP5-595.
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Resolution: Won't Fix
Regardless of the merit of your observations, a change of behavior in something
as fundamental as the TypeCoercer would have too many unexpected consequences.
> Binding of Boolean parameter - Coercion null -> false
> -----------------------------------------------------
>
> Key: TAP5-595
> URL: https://issues.apache.org/jira/browse/TAP5-595
> Project: Tapestry 5
> Issue Type: Bug
> Components: tapestry-core
> Affects Versions: 5.1.0.4, 5.0.18
> Reporter: Lukasz Jazgar
> Assignee: Howard M. Lewis Ship
>
> Null value of Boolean (non-primitive type) property is coerced to false, when
> passed to parameter of type Boolean.
> There is a example below showing this behavior:
> Component with Boolean parameter.
> BooleanComponent.java:
> public class BooleanComponent {
> @Parameter
> private Boolean value;
> boolean beginRender(MarkupWriter writer) {
> if (value!=null)
> writer.write("Component's parameter value:" + value);
> else
> writer.write("Component's parameter value is NULL);
> return false;
> }
> }
> Page passing property of type Boolean as a parameter to component
> BooleanComponent.
> 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;
> }
> }
> Observed behavior:
> 1.
> http://localhost:8080/web/booleanTestPage/yes
> Result:
> PageProperty: true
> BooleanComponent: Component's parameter value: true
> OK
> 2.
> http://localhost:8080/web/booleanTestPage/no
> Result:
> PageProperty: false
> BooleanComponent: Component's parameter value: false
> OK
> 3.
> http://localhost:8080/web/booleanTestPage/null
> Result:
> PageProperty:
> BooleanComponent: Component's parameter value: false
> <---------------!!!!!!!
> Why value of component parameter is false. Shouldn't be null?
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