I've added the namespace line to my manifest xml: <namespace>Mycompany\Component\Mycomponent</namespace>

When I install the component, I'm not seeing any alias added to the libraries/vendor/composer/autoload_psr4.php -- should Joomla regenerate that file with each component installed?

Is there any other places (besides just the namespaces in the classes themselved) that I need to register my namespace?

  • As @Sharky mentioned to you in his comment at your previous question: the Namespacemap Plugin should be turned on and that will update/create a new namespacemap for your component after a successful install.
    – Zollie
    Dec 9, 2019 at 8:59
  • @Zollie -- thanks. Is that plugin not enabled by default?
    – user101289
    Dec 9, 2019 at 18:45
  • It is actually enabled by default and as it's description says: "Automatically builds and updates the libraries\autoload_psr4.php file that is used to autoload extensions."
    – Zollie
    Dec 9, 2019 at 19:08
  • I have not checked the newer alphas of J4 but earlier there were issues with updating the classmap at extension install: github.com/joomla/joomla-cms/issues/20953.
    – Zollie
    Dec 9, 2019 at 20:16

1 Answer 1


Thanks to @Zollie-- the plugin is enabled by default and does seem to work. You'd need to check the libraries/autoload_psr4.php to verify that your component's namespace (set in the new namespace parameter in the manifest xml) is being generated correctly.

The default namespace format for custom components is DeveloperName\Component\ComponentName.

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