TYPO3 Core

I can confirm that behaviour on an even more recent 6.2-dev version after trying to extend the "news" extension as described here:

http://keinerweiss.de/525-die-extbase-extension-news-um-ein-feld-erweitern.html

Two comments might indicate that the problem exists for others, too:

http://keinerweiss.de/525-die-extbase-extension-news-um-ein-feld-erweitern.html/comment-page-1#comment-1482
http://keinerweiss.de/525-die-extbase-extension-news-um-ein-feld-erweitern.html/comment-page-1#comment-2156

It's unclear whether the latter refers to the same problem, but if it does, this would apply to 6.1.7, too.

mostly the same problem here on 6.2
adding a new property results in Warning: class_parents(): object or string expected
from DataMapper. Clearing Cache from Backend doesn't help. Truncating cf_extbase_reflection works.

seems still present in 6.2.3

The same in 4.5 LTS

Extabse cache cleaning helps :

TRUNCATE tx_extbase_cache_object;
TRUNCATE tx_extbase_cache_object_tags;
TRUNCATE tx_extbase_cache_reflection;
TRUNCATE tx_extbase_cache_reflection_tags;

Hello,

Wouter Wolters wrote:

This problem has to do with the extbase reflection cache. This needs to be emptied.
Use the clear cache button in the Install Tool.

Just a word : on one of our sites, this problem is quite regular.

And empty cache helps only for several hours.

Best regards,
Fedir

Is anyone here using powermail? We see this regularly on sites with powermail enabled.

It turned out to be Ubuntu 16.04's php-igbinary extension which got installed as dependency to php-redis. php-igbinary is outdated and has a subtle bug:

• https://bugs.launchpad.net/ubuntu/+source/php-igbinary/+bug/1651031
• https://github.com/igbinary/igbinary/issues/114

This issue occurs when your domain model misses type hints.
e.g.
you have

protected $name = '';

Instead of:

/**
 * @var string
 */
protected $name = '';

After fixing domain model and clearing cache the error goes away (checked with TYPO3 8.7)

Christian Weiske wrote:

It turned out to be Ubuntu 16.04's php-igbinary extension which got installed as dependency to php-redis. php-igbinary is outdated and has a subtle bug:

• https://bugs.launchpad.net/ubuntu/+source/php-igbinary/+bug/1651031
• https://github.com/igbinary/igbinary/issues/114

Thanks for the hint, Christian!

Just for clarification if anyone is affected by the same issue: The solution is to uninstall the `php-igbinary` package from the server. It was automatically installed together with `php-redis`, but it's not needed and can be removed. Don't forget to restart PHP after removing it!

see also https://review.typo3.org/#/c/54209/