Android Studio can't find java compiler

Question

I downloaded a Android project and wanted to try it. So I imported it to Android Studio (2.2) and when running the project i get the error:

Error:Execution failed for task ':app:compileDebugJava'. Cannot find System Java Compiler. Ensure that you have installed a JDK (not just a JRE) and configured your JAVA_HOME system variable to point to the according directory.

Before the runnning of every project worked and i'm searching for days but still found no working solution.

EDIT: Here is my project structure: project structure

Maybe someone of you has the solution.

Answer 1

This kind of problem arises when you compile old project in your new updated Android Studio IDE Version. Technically speaking : gradle build version is old. Just update with new

This can be achieve editing inside build.gradle(Project: App name)

    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.3'
//update latese gradle build version.
    }

This might do the trick.

Answer 2

I think, you didn't setup JDK for current project. You've just loaded the code. Do it in project structure.

You can do it here: File > Project Structure > [Platform Settings] > SDKs.