No IDEA annotations attached to the JDK 1.8 (C:\...), some issues will not be found

Question

In Android Studio 3.1.2 I am suddenly getting the following message in a yellow tape frame at the top of my editor:

No IDEA annotations attached to the JDK 1.8 (C:\Program Files\Android\Android Studio\jre), some issues will not be found

I also have a warning in Edit Configurations:

Default Activity not found

How can I solve these issues?

Answer 1

Solution

• Close Android Studio
• Go to C:\Users\UserName\.android and rename the build-cache folder to build-cache.bak

• Go to C:\Users\UserName\.AndroidStudio3.2\system and rename these folders

  caches to caches.bak

  compile-server to compile-server.bak

  compiler to compiler.bak

  conversion to conversion.bak

  external_build_system to external_build_system.bak

  frameworks to frameworks.bak

  gradle to gradle.bak

  resource_folder_cache to resource_folder_cache.bak

• Open the Android Studio and open your project again.

Answer 2

I have been working on 3.2.1 version since October 2018 (for 1 month).
But today I started my project in AndroidStudio with a many errors.

I tried to Invalidate Caches and Restart. But it doesn’t helped me.

So, I opened the folder C:\Users\{username}.
There I found three folders: one for the real version - .AndroidStudio3.2 and two for older versions - .AndroidStudio3.1 and .AndroidStudio2.3.

I could only delete the folder with the actual version, but I deleted all the folders. (Because I have no important user settings in AndroidStudio).

Then I restarted AndroidStudio, and I chose “Do not import settings”. Like this:

This method worked for me.