show error message through plugin Magento2 in checkout page

Question

I am using a plugin feature in module to validate the zip code for delivery available. I need to prevent the next step if the zip code is not available for delivery by showing a message in checkout page. hear i have get error message in console but not showing in site

Hear is my code

/app/code/Ship/Details/etc/di.xml

<?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:ObjectManager/etc/config.xsd">
 <type name="Magento\Checkout\Model\ShippingInformationManagement">
 <plugin name="get_shipping_info" type="Sem\Shipment\Plugin\Checkout\Model\ShippingInformationManagement" sortOrder="1" disabled="false"/>
 </type>
</config>

plugin code

/app/code/Sem/Shipment/Plugin/Checkout/Model/ShippingInformationManagement.php

<?php
namespace Sem\Shipment\Plugin\Checkout\Model;
use Magento\Framework\Exception\StateException;
class ShippingInformationManagement
{
 protected $_messageManager;
 protected $jsonResultFactory;
 public function __construct(
 \Magento\Framework\App\Action\Context $context,
 \Magento\Framework\Controller\Result\JsonFactory $jsonResultFactory,
 \Magento\Framework\Message\ManagerInterface $messageManager,
 \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory
 ) {
 $this->_messageManager = $messageManager;
 $this->jsonResultFactory = $jsonResultFactory;
 }
 public function beforeSaveAddressInformation(
 \Magento\Checkout\Model\ShippingInformationManagement $subject,
 $cartId,
 \Magento\Checkout\Api\Data\ShippingInformationInterface $addressInformation
 )
 {
 $address = $addressInformation->getShippingAddress();
 $postcode = $address->getData('postcode');
 $objectManager = \Magento\Framework\App\ObjectManager::getInstance();
 $result = $this->jsonResultFactory->create();
 $stat="no sevice";
 throw new StateException(__($stat)); 
}
}

In my console enter image description here

How can i resolve this issue now the message is not showing also i cant move to next step payment

Answer 1

Please use like this:

public function __construct(
 \Magento\Framework\App\Action\Context $context,
 \Magento\Framework\Controller\Result\JsonFactory $jsonResultFactory,
 \Magento\Framework\Message\ManagerInterface $messageManager,
 \Magento\Framework\Controller\Result\JsonFactory $resultJsonFactory
 ) {
 $this->_messageManager = $messageManager;
 $this->jsonResultFactory = $jsonResultFactory;
 parent::__construct($context);
 }

• amith lal: after change like this the error changed to" POST examole.com/rest/default/V1/… 500 Internal Server Error 2.88s"
• Nagaraju Kasa: let me check and update u
• amith lal: Any updation for this issue
• amith lal: when i use this parent::__construct($context); i'm getting the internal server it saying no access to parent class

Answer 2

You've injected ManagerInterface into the class, so you put this line before throw exception

$this->messageManager->addErrorMessage('no service');

And the result will be like this

enter image description here