TYPO3 Core

When installing an extension, which depends on an extension with ext_autoload.php, the class-information in that file is not available soon enough.

I have an extension, which depends on realurl and also tries to import data with a data.t3d file in the Initialisation-folder.

Realurl registers a hook for process_datamap:
$TYPO3_CONF_VARS['SC_OPTIONS']['t3lib/class.t3lib_tcemain.php']['processDatamapClass']['tx_realurl'] = 'EXT:realurl/class.tx_realurl_tcemain.php:&tx_realurl_tcemain';

The constructor of this class relies on autoloading the tx_realurl_apiwrapper, which results in the following Error

Fatal error: Class 'tx_realurl_apiwrapper' not found in /typo3/typo3conf/ext/realurl/class.tx_realurl_tcemain.php on line 49
Call Stack
#    Function Location
1    main}( )    ../mod.php:0
2    TYPO3\CMS\Extbase\Core\ModuleRunner->callModule( )    ../mod.php:38
3    TYPO3\CMS\Extbase\Core\Bootstrap->run( )    ../ModuleRunner.php:67
4    TYPO3\CMS\Extbase\Core\Bootstrap->handleRequest( )    ../Bootstrap.php:184
5    TYPO3\CMS\Extbase\Mvc\Web\BackendRequestHandler->handleRequest( )    ../Bootstrap.php:195
6    TYPO3\CMS\Extbase\Mvc\Dispatcher->dispatch( )    ../BackendRequestHandler.php:33
7    TYPO3\CMS\Extbase\Mvc\Controller\ActionController->processRequest( )    ../Dispatcher.php:69
8    TYPO3\CMS\Extbase\Mvc\Controller\ActionController->callActionMethod( )    ../ActionController.php:157
9    call_user_func_array:{/typo3/typo3_src/typo3/sysext/extbase/Classes/Mvc/Controller/ActionController.php:286} ( )    ../ActionController.php:286
10    TYPO3\CMS\Extensionmanager\Controller\ActionController->toggleExtensionInstallationStateAction( )    ../ActionController.php:286
11    TYPO3\CMS\Extensionmanager\Service\ExtensionManagementService->installExtension( )    ../ActionController.php:64
12    TYPO3\CMS\Extensionmanager\Service\ExtensionManagementService->installDependencies( )    ../ExtensionManagementService.php:158
13    TYPO3\CMS\Extensionmanager\Utility\InstallUtility->install( )    ../ExtensionManagementService.php:254
14    TYPO3\CMS\Extensionmanager\Utility\InstallUtility->processDatabaseUpdates( )    ../InstallUtility.php:113
15    TYPO3\CMS\Extensionmanager\Utility\InstallUtility->importT3DFile( )    ../InstallUtility.php:235
16    TYPO3\CMS\Impexp\Utility\ImportExportUtility->importT3DFile( )    ../InstallUtility.php:472
17    TYPO3\CMS\Impexp\ImportExport->importData( )    ../ImportExportUtility.php:52
18    TYPO3\CMS\Impexp\ImportExport->writeRecords_pages( )    ../ImportExport.php:1445
19    TYPO3\CMS\Core\DataHandling\DataHandler->process_datamap( )    ../ImportExport.php:1802
20    TYPO3\CMS\Core\Utility\GeneralUtility::getUserObj( )    ../DataHandler.php:929
21    TYPO3\CMS\Core\Utility\GeneralUtility::makeInstance( )    ../GeneralUtility.php:4366
22    TYPO3\CMS\Core\Utility\GeneralUtility::instantiateClass( )    ../GeneralUtility.php:4414
23    tx_realurl_tcemain->__construct( )    ../GeneralUtility.php:4432

Realurl has an ext_autoload.php, but the data within the file is not available until AFTER the installation process has completly finished.

This error also appeared, after set both extensions to clearCacheOnLoad.

The bug might be related to #65785