Mrthdrb

I created a simple module Wow_Page to create a Hello world page using route.xml with the help of magento 2 devdocs. But when i type the route in the url it is showing 404 error page not found.
My Code is as bellow-
app/code/Wow/Page/registration.php

 <?php MagentoFrameworkComponentComponentRegistrar::register(
 MagentoFrameworkComponentComponentRegistrar::MODULE, 'Wow_Page',
 __DIR__
);

app/code/Wow/Page/etc/module.xml

 <?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
 <module name="Learning_FirstUnit" setup_version="0.0.1"> <sequence>
 <module name="Wow_Page"/> </sequence>
 </module>
</config>

app/code/Wow/Page/etc/frontend/routes.xml

 <?xml version="1.0"?>
<!--
/**
* Copyright © 2016 Magento. All rights reserved. * See COPYING.txt for license details.
*/
-->
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:App/etc/routes.xsd">
 <router id="standard">
 <route id="learning" frontName="test">
 <module name="Wow_Page" />
 </route>
 </router>
</config>

and finally the controller file
app/code/Wow/Page/Controller/Page/View.php

 <?php /**
 * Copyright © 2016 Magento. All rights reserved.
 * See COPYING.txt for license details.
 */
namespace WowPageControllerPage;
class View extends MagentoFrameworkAppActionAction

 /**
 * @var MagentoFrameworkControllerResultJsonFactory
 */
 protected $resultJsonFactory;
 /**
 * @param MagentoFrameworkAppActionContext $context
 * @param MagentoFrameworkControllerResultJsonFactory $resultJsonFactory
 */
 public function __construct(
 MagentoFrameworkAppActionContext $context,
 MagentoFrameworkControllerResultJsonFactory $resultJsonFactory)
 
 $this->resultJsonFactory = $resultJsonFactory;
 parent::__construct($context);
 
 /**
 * View page action
 *
 * @return MagentoFrameworkControllerResultInterface
 */
 public function execute()
 
 $result = $this->resultJsonFactory->create();
 $data = ['message' => 'Hello world!'];

 return $result->setData($data);
 

Your module.xml is incorrect

app/code/Wow/Page/etc/module.xml

Your current module.xml

 <?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
 <module name="Learning_FirstUnit" setup_version="0.0.1"> <sequence>
 <module name="Wow_Page"/> </sequence>
 </module>
</config>

replace with below code

 <?xml version="1.0"?>
<config xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:noNamespaceSchemaLocation="urn:magento:framework:Module/etc/module.xsd">
 <module name="Wow_Page" setup_version="0.0.1"></module>
</config>

you have added self-module into <sequence></sequence>, you can't do it into self-module, try it in another module if you need it otherwise leave it.

run below command

php bin/magento setup:upgrade && php bin/magento setup:static-content:deploy -f