twig - Which templates should be overridden in Symfony 2 error customization?

Question

From the documentation:

All of the error templates live inside TwigBundle. To override the templates, we simply rely on the standard method for overriding templates that live inside a bundle.

And:

To see the full list of default error templates, see the Resources/views/Exception directory of the TwigBundle.

Looking at the after-mentioned directory i can find several files. I'm interested in custom templates for 403, 404 and 500 errors, so i created error.html.twig (parent template) and error403.html.twig, error404.html.twig and error500.html.twig that extends from 'TwigBundle:Exception:error.html.twig' (overridden by my custom parent template).

Is this correct? What happens if another kind of error or exception is thrown?

Answer 1

Yes it is correct.

All other kind of exceptions will be caught by Kernel and error500.html.twig page will be rendered.

To test it, you can turn off your debug for a moment, by switching second parameter passed to AppKerner constructor in app_dev.php

$kernel = new AppKernel('dev', false);

Then you can

1. type wrong address to test 404 error page
2. throw any exception to test 500 error page

throw new Exception(); // test 500 error page

1. throw

throw new SymfonyComponentHttpKernelExceptionAccessDeniedHttpException();
or
throw new SymfonyComponentHttpKernelExceptionHttpException(403); //to test 403 error page