This isn’t a proper fix. Last I knew the finder CLI wasn’t booting up the environment correctly and that still needs to be addressed (like making it a proper console command would be a good idea).

How is that going to fix the issue though? Console application doesn't have getMenu() method either.

Then there needs to be a type check.

The getMenu() method is only defined as part of CMSWebApplicationInterface so there should be a type check for that and an appropriate workaround if the type does not match. Pulling an application instance out of the container is a red flag.

Or, just skip going through the application and directly call AbstractMenu::getInstance(). Abusing Factory::getContainer() is just wrong though.

Switched to AbstractMenu::getInstance(). Thanks.

Any explanation on why getting it from the container is wrong?

Factory::getContainer() isn't intended to be a replacement for any existing factory singletons or static instance methods. Sooner or later, the right thing to do would be have dependencies correctly injected into services, which the container helps with orchestrating. So calls to Factory::getContainer() really should be few and far between, and if you're thinking about using it then maybe you need to be looking for another approach to whatever you're intending to accomplish.

Unfortunately, a lot of the core architecture still isn't in a great place to handle dependency injection for one reason or another (static methods accessing globals, classes randomly instantiated in places where there isn't a sane way to support injection, core still being designed around a lazy load paradigm meaning if you're trying to use something that doesn't originate out of the Joomla\CMS namespace you're stuck trying to load those services yourself in some form, etc.), so the container was added as a global in the factory to help write code that assists in the migration to a proper service oriented infrastructure.

Well, I just needed to get a specific application instance for now. Joomla\CMS\Factory::getApplication() no longer supports this in 4.0 and Joomla\CMS\Application\CMSApplication::getInstance() is deprecated with Joomla\CMS\Factory::getContainer()->get() as replacement so I used that.

I have tested this item ✅ successfully on 39a4193

Result Output:
Smart Search INDEXER

Starting Indexer
Setting up Smart Search plugins
Setup 31 items in 0.066 seconds.

• Processed batch 1 in 0.476 seconds.
• Skipping pause, as previous batch had a very low processing time (0.476s < 1s)
  Total Processing Time: 0.542 seconds.
  Peak memory usage: 14,680,064 bytes

I have tested this item ✅ successfully on 39a4193

RTC.

Thanks!