typo3 flow: catch exception and forward back to originating action - flow-framework

Question

In my typo3 flow app I want to stop execution after throwing an exception as flash-message. Therefore I wrote this:
public function updateAction(Mitglied $mitglied) {
if ($xy == 'z') {
try {
throw new \TYPO3\Flow\Validation\Exception\InvalidValidationOptionsException('Fehler: In dieser Kombination nicht zulässig', 1);
} catch (\TYPO3\Flow\Validation\Exception\InvalidValidationOptionsException $e) {
$this->flashMessageContainer->addMessage(new \TYPO3\Flow\Error\Error($e->getMessage()));
}
}
$this->mitgliedRepository->update($mitglied);
$this->addFlashMessage('Mitglied erfolgreich geändert.');
$this->redirect('index');
}
The message ist shown, as I wanted, as flash-message. But the execution of the function doesn't stop. Does anybody know, why and how to prevent? A redirect to the originating action would be desired for the case, that the if-condition is true.

Answer 1

I got it now with the following code:
// get back to originating request - see https://git.typo3.org/Packages/TYPO3.Flow.git/blob/master:/Classes/TYPO3/Flow/Mvc/Controller/ActionController.php
$referringRequest = $this->request->getReferringRequest();
if ($referringRequest === NULL) {
return;
}
$packageKey = $referringRequest->getControllerPackageKey();
$subpackageKey = $referringRequest->getControllerSubpackageKey();
if ($subpackageKey !== NULL) {
$packageKey .= '\\' . $subpackageKey;
}
$argumentsForNextController = $referringRequest->getArguments();
$argumentsForNextController['__submittedArguments'] = $this->request->getArguments();
$argumentsForNextController['__submittedArgumentValidationResults'] = $this->arguments->getValidationResults();
$this->forward($referringRequest->getControllerActionName(), $referringRequest->getControllerName(), $packageKey, $argumentsForNextController);
In the end this is much easier:
$this->errorAction()->forwardToReferringRequest();