service :

/**
     * CandidateSkillHandler constructor.
     *
     * @param CandidateSkillRepositoryDecorator $entityManager
     * @param CandidateSkillFormHandler         $formHandler
     * @param TokenStorageInterface         $tokenStorage
     * @param CandidateSkillEntityRepository $repo
     */
    public function __construct(CandidateSkillRepositoryDecorator $entityManager, CandidateSkillFormHandler $formHandler, TokenStorageInterface $tokenStorage, CandidateSkillEntityRepository $repo)
    {
        $this->repository = $entityManager;
        $this->formHandler = $formHandler;
        $this->user = $tokenStorage->getToken()->getUser();
        $this->repo= $repo;
    }

    /**
     * {@inheritdoc}
     */
    public function post(array $parameters, bool $submitted = false, array $options = [])
    {
        $candidateSkill = $this->formHandler->handle(new CandidateSkill(), $parameters, Request::METHOD_POST, $submitted, $options);
var_dump($candidateSkill);
        if ($candidateSkill instanceof CandidateSkill) {
            var_dump('2');
            $candidateSkill->getSkill()->addCandidate($this->user);
            var_dump("3");
            $candidateSkill->setCandidate($this->user);
            var_dump("4");
            $this->repository->save($candidateSkill);
            var_dump("5");
        }
        return $candidateSkill;
    }

************************

commondoctrine():

 /**
     * @param mixed $object
     * @param array $arguments
     */
    public function save($object, array $arguments = ['flush' => true])
    {
        $this->em->persist($object);

        if (true === $arguments['flush']) {
            $this->em->flush();
        }
    }