TYPO3 10.4 Symfony Expression Language - class not found

Question

I'm trying to customize my TypoScript conditions with Symfony Expression Language. I've followed the instructions of the example of typo3.

So i created a new file Example_Ext/Configuration/ExpressionLanguage.php with the example hook and also created both files CustomTypoScriptConditionProvider.php and CustomConditionFunctionsProvider.php in Example_Ext/Classes/ExpressionLanguage

However, as soon as I load my extension i just get the error Class \Vendor\Example_Ext\ExpressionLanguage\CustomTypoScriptConditionProvider not found and tbh I don't know why. I also cleared all cache, un-/loaded the extension a couple of times and cleared the autoloader as mentioned in another thread. But it still won't work. I know that this error occurs in the first hook ExpressionLanguage.php because if I change the path to the file the error changes also to the new path.

Any suggestions how to fix this problem?

Kind regards.

Answer 1

After a long time of debugging I found the mistake. Apparently, it is easy to misunderstand the example

Additional functions can be provided through another class, which has to be returned by CustomTypoScriptConditionProvider PHP class:

<?php

namespace Vendor\ExtensionName\TypoScript;

As described above I added a new file in Example_Ext/Classes/ExpressionLanguage but according to this code snippet, i.e., the namespace, this class has to be in Example_Ext/Classes/TypoScript.

Second at all I had issues with my composer.json file. It seems some errors have prevented the autoloader to load the Example_Ext extension. Therefore the class could not be found additionally to the non existing class according to the namespace.

So after fixing the namespace to Example_Ext/Classes/ExpressionLanguage all works fine now.

Please Notice: Custom functions with prefix user or user_ are not callable.