Symfony2: Catch exception in the controller and show flash message

try{
 $em = $this->getDoctrine()->getManager();
 $em->persist($entity);
 $em->flush();

 $this->get('session')->setFlash('notice', 'Article inserted!');
 return $this->redirect($this->generateUrl('article_show', array('id' => $entity->getId())));
}catch(\Exception $e){
 // log $e->getMessage()
 $this->get('session')->setFlash('error', 'Can't insert the article.');
}

return $this->render('MyTestBundle:Article:new.html.twig', array(
 'entity' => $entity,
 'form' => $form->createView(),
));

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