private function initializeService($serviceId, array $constructorArguments) {
		
		if(!isset($this->config->services[$serviceId])) {
			throw new ApplicationException(sprintf("Service '%s' not configured.", $serviceId));
		}

		$configData = $this->config->services[$serviceId];

		// get class name

		$class	= $configData['class'];

		// create instance and pass additional parameters to constructor

		try {
			$service = new $class(...$constructorArguments);
		}
		catch(\Exception $e) {
			throw new ApplicationException(sprintf("Instancing of service '%s' failed. Error: %s", $serviceId, $e->getMessage()));
		}

		// check whether instance implements ServiceInterface  

		if(!$service instanceof ServiceInterface) {
			throw new ApplicationException(sprintf("Service '%s' (class %s) does not implement the ServiceInterface.", $serviceId, $class));
		}

		// set parameters
		
		$service->setParameters($configData['parameters']);
		
		return $service;

	}