enable Annotation Processors option in Android Studio 2.2

Question

I\'m trying to use java 8 in my project and for that I added the jack compiler.

After enabling jack I started having problems with libraries that use Annotation Proc

Answer 1

Close the project. In the "Welcome to Android Studio" dialog click "Configure" in the bottom right corner.

Then,

Settings > Build, Execution, Deployment > Compiler > Annotation Processors. Tick 'Enable annotation processing'.

If that does not work. Delete the project from "Welcome to Android Studio" dialog and open from new.

Worked for me.

Answer 2

You can enable Annotation Processors without closing your project in Android Studio 2.3:

File -> Other Settings -> Default Settings

Build, Execution, Deployment -> Compiler -> Annotation Processors -> 
Enable annotation processing.

Don't forget to clean, build, invalidate and restart after that.
Cheers!

Answer 3

1. Close your project.
2. Settings > Build, Execution, Deployment > Compiler > Annotation Processors. Check 'Enable annotation processing'.
3. Open your project.
4. File > Invalidate Caches / Restart... > Invalidate and Restart

Wait for the process completely, then everything will be fine.

Answer 4

Adding to @Jacques Koorts and @mtrakal

If you can't get to the "Welcome to Android Studio" screen. Try File -> Close Project instead of clicking the X icon. Then you'll get the "Welcome to Android Studio" screen and you'll see the gear in the bottom right. Follow the accepted answer after that and possibly the cache invalidation.