Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() must be compatible

I had the same issue and I've installed patch from https://www.drupal.org/project/search_api_solr/issues/3449292 🐛 Fatal error Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() Fixed
After installing patch, the error changed to:

PHP Fatal error:  Declaration of Drupal\Core\DependencyInjection\DependencySerializationTrait::__wakeup() must be compatible with Drupal\search_api\Backend\BackendPluginBase::__wakeup(): void in /var/www/html/web/core/lib/Drupal/Core/DependencyInjection/DependencySerializationTrait.php on line 74

Fatal error: Declaration of Drupal\Core\DependencyInjection\DependencySerializationTrait::__wakeup() must be compatible with Drupal\search_api\Backend\BackendPluginBase::__wakeup(): void in /var/www/html/web/core/lib/Drupal/Core/DependencyInjection/DependencySerializationTrait.php on line 74

Same error for me.
Something is wrong

This update also breaks elasticsearch_connector → . It's bad practice to change declarations within a minor update, for BC that needs to be a major update.

same problem with search_api_opensearch

Same here

Core 10.2 & 10.3 does not have __sleep() :array & __wakeup() :void changes (return type is not set) into "DependencySerializationTrait", just has it core 11 (it was included but reverted into 3425537), making a patch just for the transition time for core 10 for those using search api solr.

https://git.drupalcode.org/project/drupal/-/blob/10.3.x/core/lib/Drupal/...
https://git.drupalcode.org/project/drupal/-/blob/10.3.x/core/lib/Drupal/...

https://git.drupalcode.org/project/drupal/-/blob/11.0.x/core/lib/Drupal/...
https://git.drupalcode.org/project/drupal/-/blob/11.0.x/core/lib/Drupal/...

Patch from comment 🐛 Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() must be compatible Active fixes the issue alongside with patch from the related issue.

Thanks @CRZDEV
Patch from #7 🐛 Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() must be compatible Active works well. Although its name is bit confusing, because it suggests patch is form search_api_solr, while it is for search_api :)

After upgrade of Search API to 8.x-1.35 I could get everything to work correctly after applying two patches:
https://www.drupal.org/project/search_api_solr/issues/3449292 🐛 Fatal error Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() Fixed for Search API SOLR
https://www.drupal.org/project/search_api/issues/3454939#comment-15642321 🐛 Declaration of Drupal\search_api_solr\Plugin\search_api\backend\SearchApiSolrBackend::__sleep() must be compatible Active for Search API

Looks like both modules needs to be released to have those issues covered in Drupal<11

Yeah srry for that, i was not sure if that fix was going to work also for other module combinations like opensearch or elasticsearch, that was the only reason for using that name. Thanks for checking anyway!

Julien Tekrane → made their first commit to this issue’s fork.

I approve #9. THANK YOU

This was fixed in Search API OpenSearch by overriding \Drupal\Core\DependencyInjection\DependencySerializationTrait::__wakeup() to add a return type. See 🐛 Handle missing return type in __wakeup() Fixed

For D10 I need these 3 patches:

Issue #3454939 (search_api):
- https://www.drupal.org/files/issues/2024-06-17/3454939-search-api-solr-c... →
- https://git.drupalcode.org/project/search_api/-/merge_requests/148.diff (Commit #eb63433e4a229613836c24811d7aa82b37ff7db4)

Issue #3449292 (search_api_solr):
- https://www.drupal.org/files/issues/2024-06-17/search-api-solr-fatal-err... →

Following the lead of Search API OpenSearch shown in #14 I opened an issue on Search API SolR queue: 🐛 Declaration of Drupal\Core\DependencyInjection\DependencySerializationTrait::__wakeup() must be compatible Needs review

Not all patches mentioned here are the correct ones for Search API Solr.
I'm preparing a new Search API Solr release.

rolling back solr_api from 1.35 to 1.34 seems to fix the issue for me for now.

Thank you

A temporary fix until search_api_solr fixes from its end.

This patch in #20 can't be applied. It would break the Drupal 11 compatibility which is already declared in composer.json and info.yml.

Search API Solr should be compatible to Search API 1.35 and to Drupal 10 & 11
https://www.drupal.org/project/search_api_solr/releases/4.3.4 →

Thank you @mkalkbrenner!

Automatically closed - issue fixed for 2 weeks with no activity.

downgrade worked here.