Android Studio doesn't recognize JDK

Question

My Android Studio suddenly stopped recognizing JDK. it starts fine with no error messages. I have JDK 1,7 (x86 version) on windows 8.1. Environment variable is defined in the system variables and I can run java -version command from cmd with no issue. following screen shot describe the problem clearly:

Answer 1

You may need to check if both JDK and SDK are set correctly.

In the current project :

• Go to File > Project Structure..
• Explore the sections " Android SDK Location " and " JDK Location " (Put the complete paths)
• Click OK to save changes

For projects default :

• Close current Project (File > Close project)
• Click on Configure > Project Defaults > Project Structure
• Explore the sections " Android SDK Location " and " JDK Location " (Put the complete paths)
• Click OK to save changes

Restart Android Studio and try again.

Screenshot: http://i.imgur.com/0OD8OeJ.png (I cannot post images directly)

Answer 2

After spending one night trying to solve this problem, i just did as suggested by yole

So Simple : File ----> Invalidate.

Answer 3

I had the same problem after upgrading to build tool 22.0.1. I solved this issue by removing dependencies and adding it again like app-compact and play services.