Do you mean you want more details on the exception? You might have tapestry.production-mode set to true, Set this to false to have the full fledged exception report.

As for the exception: it probably means you have a t:id="help" in your component main.layout but have probably not defined the t:type="whateverYourHelpComponentsTypeIs" or in your java class: @Component(id = "help") private YourHelpComponent help;

Cheers,
Joost





Angelo Chen wrote:
Hi,

often when url contains main.layout.help, and exception happens, how to
capture this in the page? thanks,

 RequestExceptionHandler Unexpected runtime exception: Component Main:layout
does not contain an embedded component with id 'help'. Available components:


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