protected function resolveKernel()
{
if ($this->kernel !== null) {
return $this->kernel;
}
$class = 'Symfony\\Component\\EventDispatcher\\EventDispatcherInterface';
$eventDispatcher = $this->container->isBound($class) ? $this->container->resolve($class) : null;
$kernel = new Kernel($this->getRouter(), $this->requests, $this->errorHandler, $eventDispatcher);
return $this->kernel = $this->resolveStack()->resolve($kernel);
}