[3.8.9] Class 'JClassLoader' not found on Windows Based Hosting

[PhilETaylor]

Leaving this here to prevent duplicates, will close if not a major issue later in the day, see how many others effected. As discussed with @mbabker already.

MAY be related to auto loader changes in Joomla 3.8.9 on WINDOWS machines.

Steps to reproduce the issue

Upgrade to Joomla 3.8.9

Update failed at
http://justatest/administrator/index.php?option=com_joomlaupdate&task=update.finalise&e63f3ad56a496e6fa0a4db3b96627288=1

Expected result

No errors

Actual result

The update of a clean, out-of-the-box 3.8.8 on localhost (Wampserver 3.1.3, PHP 7.1.4) to 3.8.9 fails with the error Fatal error: Uncaught Error: Class 'JClassLoader' not found in C:\www\justatest\libraries\cms.php on line 40

[toivo]

Tested this in a newly installed 3.8.8 site on Wampserver and confirmed the error.

[AlekVolsk]

Windows 8.1, PHP x64 7.0.21 / 7.1.7, mariadb 10.2 x64

Fatal error: Uncaught Error: Class 'JClassLoader' not found in C:\OS527\domains\tmp.local\libraries\cms.php:40 Stack trace: #0 C:\OS527\domains\tmp.local\includes\framework.php(18): require_once() #1 C:\OS527\domains\tmp.local\index.php(40): require_once('C:\\OS527\\domain...') #2 {main} thrown in C:\OS527\domains\tmp.local\libraries\cms.php on line 40

workaround: extract the Joomla_3.8.8-Stable-Update_Package files in the root of the site

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@PhilETaylor a thumbs up says either to support your post or to agree with your statement or to confirm the described problem

[Matysh]

Update 3.8.8 -> 3.8.9
Windows server 2016
Apache 2.4
Php 5.6.35
mariadb 10.2 x64
Valid.

I tryed to replace all file in my installation, but still this error.

[AgilityCC]

I had the same problem with Auto-Update, Partial update via FTP, and full update via FTP. I had to revert back to 3.8.8.

3.8.9
Windows Server 2012 R2
PHP 5.6.30
IIS 8.5
cgi-fcgi

[kkaazzoo]

Windows 10, PHP x64, 7.1.7, MySQL 5.7 x64.

[toivo]

Windows 10, Apache 2.4.23, MySQL 5.7.14, PHP 7.1.14 - all 64-bit in Wampserver 3.1.3

[brianteeman]

It is the changes made to address security issue

[AlekVolsk]

I. e. on your use of servers on the windows platform is unsafe?

[mbabker]

See #20877

[toivo]

The patch got my test site up and running, thanks to the team!

[mikesteele81]

@PhilETaylor The patch got my site back online. I was then able to apply update 3.8.10 without any trouble.