TYPO3.Flow

I stumbled upon this requirement since I got a TYPO3\Flow\Property\Exception\TargetNotFoundException in the \TYPO3\Flow\Property\TypeConverter\PersistentObjectConverter::fetchObjectFromPersistence method: this one leads to an TYPO3\Flow\Property\Exception exception, hence the custom error view handling is not able to catch the actual exception and result into a 404, for example.

My idea would be to allow one to catch particular property mapping exceptions and call user defined code, this could look, for example, like

 1public function initializeShowAction() {
 2    $productPropertyMappingConfiguration = $this->arguments->getArgument('product')->get.....;
 3    $productPropertyMappingConfiguration
 4    //  ->forProperty('datasheetResource')
 5      ->catchTypeConverterException(
 6          'TYPO3\Flow\Property\Exception\TargetNotFoundException',
 7          1297933823,
 8          function(\Exception $exception) use ($controller) {
 9              $controller->getResponse->setHeader(404);
10              // ok this is becoming pseudo code now ;)
11          })
12}