Call to a member function getResponse() on null in observer while generating the shipment in magento2.4.3

Question

<event name="sales_order_shipment_save_before">
    <observer name="test_beforeshipment" instance="Module\ModuleName\Observer\BeforeShipment" />
</event>

public function execute(\Magento\Framework\Event\Observer $observer)
{
    $shipment = $observer->getEvent()->getShipment();
    $order = $shipment->getOrder();
    $orderId = $order->getId();
    $redirectUrl = $this->url->getUrl('sales/order/view/order_id/'.$orderId);
    $this->responseFactory->create()->setRedirect($redirectUrl)->sendResponse();
    $observer->getControllerAction()->getResponse()->setRedirect($redirectUrl);
    return $this;
}

Answer 1

If you want to do that then on __construct() function of your class observer, you must inject two classes.

First, \Magento\Framework\App\ResponseFactory which is responsible for redirection, Another class \Magento\Framework\UrlInterface will make a URL for that redirection. Then create object for ResponseFactory, and using setRedirect($YourUrl)->sendResponse(); redirect to your wished URL. Observer https://pastebin.com/4HwLUrth