Erro na remoção + JPA!

DaoFactory factory = null;
    Funcionario funAux = null;
    try{
      factory = new DaoFactory(emf.createEntityManager());    
      factory.beginTransaction();      
      funAux = factory.getFuncionarioDao().atualiza(fun); //aqui ele faz um merge()
      factory.getFuncionarioDao().remove(funAux);
      factory.commit();
    }catch(Exception e){
      factory.rollback();
      e.printStackTrace();
    }finally{
      factory.close();
    }