update from alpha are still not supported

I still think that’s a BS policy as right now you are basically telling people to not test J4 as a real website and only use it as a test bed for new features. Maybe one day this project will actually get serious about supporting proper end-to-end development workflows and not telling people to get bent for answering the call to testing.

This may damn well be a legitimate update issue in the 4.0 code. Is it going to be blown off until you release 4.0.1?

as long we are still in alpha.... shouldn't seems to me a big problem,
anyway, you know that we are very few that shake they hand in the dust, so i've just informed what it is available right now... surely i agree with you that this problem should be resolved as soon as possibile, anyway, we have had the same issue on the 1.x/2.x./3.x

This will be an issue updating stable versions if not fixed. It's caused by namespace map not being re-generated when updating Joomla.

We should probably always delete that file on upgrade in the script. We already have the plugin doing it on every extension install.

Is it enough to just add this to the namespacemap plugin

	/**
	 * Update / Create map on Joomla update
	 *
	 * @param   JInstaller  $installer  Installer instance
	 *
	 * @return  void
	 *
	 * @since   4.0.0
	 */
	public function onJoomlaAfterUpdate()
	{
		// Update / Create new map
		$this->fileCreator->create();
	}

I’m not at a computer now to check - but I’m not aware of an event like that. I think we’d need to trash the file like we do in the plugin but direct in script.php

@wilsonge I didnt invent it - it already exists ;)

Enjoy the game

maybe a simple & silly solution can be adding

$recreate = new JNamespacePsr4Map;
$recreate ->create();

after https://github.com/joomla/joomla-cms/blob/4.0-dev/administrator/components/com_admin/script.php#L105

Closing as the reported issue is no longer reproducible. See #29841 instead.