The autoloader throws an exception on class_exists

[sidolov]

Summary (*)

The autoloader throws an exception on class_exists. That is clearly an unexpected behavior according to the documentation: http://php.net/manual/en/function.class-exists.php

This will cause issues when including third-party libraries that are not written for Magento.

An autoloader that throws an exception is not PSR-4 compliant

Examples (*)

Run class_exists('FooFactory'). It should return false but an error is thrown instead.

To reproduce the issue apply changes from the #14085

Expected result: there is no error thrown
Actual result: autoloader throws an exception

@Vinai, @kandy, @orlangur I moved content from the #14085 to current issue.

Proposed solution

[magento-engcom-team]

Hi @sidolov. Thank you for your report.
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Please make sure that the issue is reproducible on the vanilla Magento instance following Steps to reproduce. To deploy vanilla Magento instance on our environment, please, add a comment to the issue:

@magento-engcom-team give me 2.3-develop instance - upcoming 2.3.x release

For more details, please, review the Magento Contributor Assistant documentation.

@sidolov do you confirm that you was able to reproduce the issue on vanilla Magento instance following steps to reproduce?

• yes
• no

[magento-engcom-team]

Hi @engcom-backlog-nazar. Thank you for working on this issue.
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[magento-engcom-team]

@engcom-backlog-nazar Thank you for verifying the issue. Based on the provided information internal tickets MAGETWO-97979, MAGETWO-97980 were created

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[magento-engcom-team]

Hi @Vinai. Thank you for working on this issue.
Looks like this issue is already verified and confirmed. But if your want to validate it one more time, please, go though the following instruction:

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[Vinai]

#mm19in

[magento-engcom-team]

Hi @sidolov. Thank you for your report.
The issue has been fixed in #20950 by @Vinai in 2.3-develop branch
Related commit(s):

• cab38a21087525b72add16910b6eccf7eb7e1b63
• cfbf8c9e7422134f3419eaf719f4b0178075c844
• 9d3bc1877c4d48eae2e0ef7e7acc33b617474ecc

The fix will be available with the upcoming 2.3.2 release.

[magento-engcom-team]

Hi @sidolov. Thank you for your report.
The issue has been fixed in #21435 by @amol2jcommerce in 2.2-develop branch
Related commit(s):

• 2e58ab6009c68ea1e4e0095897517c68273995f9
• 3de1647e51215ba933f007cab64e9483f2487c61

The fix will be available with the upcoming 2.2.9 release.