404 View not found [name, type, prefix]

Question

I'm currently building a new Joomla! 4 component from scratch by following along a series of blog posts since I am new to Joomla! and its development.

I am using Joomla! 4.1.5

Unfortunately I am not able to get the front-end part working while the back-end part works fine. I always get the "View not found" error when trying to visit any front-end site of the component.

The error shown is this:

404 View not found [name, type, prefix]: foo, html, foo\component\bar\site\controller\displayView

What I did is:

1. Add a DisplayController to the site part with path com_foo/src/Controller/DisplayController.php

namespace Foo\Component\Bar\Site\Controller;

use Joomla\CMS\MVC\Controller\BaseController;

class DisplayController extends BaseController
{
    public function display($cachable = false, $urlparams = []): DisplayController
    {
        return parent::display($cachable, $urlparams);
    }
}

2. Add a View to the site part with path com_foo/src/View/Foo/HtmlView.php

namespace Foo\Component\Bar\Site\View\Foo;

use Joomla\CMS\MVC\View\HtmlView as BaseHtmlView;

class HtmlView extends BaseHtmlView
{
    public function display($template = null)
    {
        parent::display($template);
    }
}

3. Add a template with very basic content to the site part with path: com_foo/tmpl/foo/default.php

default template for foo part

4. Install component (with uninstalling the old one before).
5. Go to URL http://localhost/index.php?option=com_foo&view=foo
6. The error is shown

Answer 1

I was able to resolve the issue. The DisplayController of the front-end part was lacking a proper constructor, once I added it the site part works as well.

namespace Foo\Component\Bar\Site\Controller;

use Joomla\CMS\MVC\Controller\BaseController;

class DisplayController extends BaseController
{
    public function __construct($config = [], MVCFactoryInterface $factory = null, ?CMSApplication $app = null, ?Input $input = null)
    {
        parent::__construct($config, $factory, $app, $input);
    }

    public function display($cachable = false, $urlparams = []): DisplayController
    {
        return parent::display($cachable, $urlparams);
    }
}