Have tried getting Craft working on Google App Engine (GAE) using the GAE SDK and after defining CRAFT_STORAGE_PATH first up in the index.php, setting it to a Google Cloud Storage path eg. gs://craft-gae-storage/ I found I had to uncomment the workings of craft_ensureFolderIsReadable function in bootstrap.php so it didn't fail on the folder checks, but then it still dies with the error:

Fatal error: Class 'Craft\PhpMessageSource' not found in /Users/.../Craft-gae-HappyLager/craft/app/framework/YiiBase.php on line 213

I'm using the HappyLager demo combined with the Yii GAE codebase from https://github.com/poul-kg/yii-app-engine with a slightly modified base setup to try to get craft working: https://github.com/moldedjelly/craft-gae

  • So it just can't resolve that file/class? Does it exist in craft/app/etc/i18n?
    – Brad Bell
    May 8, 2015 at 17:17
  • Yep, PhpMessageSource.php exists in craft/app/etc/i18n. Is there something I can put in a PHP file to output the paths to make sure they're being set correctly? May 9, 2015 at 11:55
  • echo __FILE__; or Craft::log(__FILE__, LogLevel::Info, true); if you want it to go to Craft's log files.
    – Brad Bell
    May 9, 2015 at 13:45
  • Further investigating, the Craft class mappings are not being created... I've got the HappyLager demo site working fine on a standard LAMP stack and doing a print_r of the self::$classMap in YiiBase.php no probs: [CLogger] => /Users/.../CLogger.php [Craft\BaseAssetSourceType] => /.../BaseAssetSourceType.php [Craft\GoogleCloudAssetSourceType] => /.../GoogleCloudAssetSourceType.php etc. But trying to output the same from GAE, it only has mapped CLogger. There is something with the class import & autoload functions. It was returning false from the autoload function (line 436) May 12, 2015 at 11:59
  • Another difference with the LAMP setup vs. GAE: I put an echo in getComponent and can see that the LAMP setup does getComp. for these classes in order: Craft\CacheService, Craft\ConfigService, Craft\PathService, Craft\HttpRequestService etc. whereas GAE with the same tries to get only the 1 component Craft\PhpMessageSource - then it halts on the error in the original question... Does this difference in the loading (or not loading) of the classes help to indicate what's going wrong? May 13, 2015 at 5:42

1 Answer 1


I got the same error and started debugging with XDebug.

I've put some hours in this and my conclusion is: You can't run Craft on GAE. It gets worse: You can't even run Yii1 (the framework Craft was built on) on GAE. So that's where it stops.

I did manage to get Craft running on a GAE development server instance, but to do that I had to uncomment every filesystem check in both Craft and Yii (functions like is_dir(), etc). These functions don't even work with the gs:// wrapper.

  • I'd suspect Yii 2 is going to have the same issue, right? So basically "you can't run any PHP app that uses file system methods on GAE"?
    – Brad Bell
    Jun 10, 2015 at 18:56
  • It's been an open issue for a while now there, see github.com/yiisoft/yii2/issues/953 Jun 11, 2015 at 13:27

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