Where are Gradle logs?

Question

Gradle build for an app in Android Studio generates the following error:

Error:Execution failed for task \':app:compileDebugJavaWithJavac\'.
> java.lang.R         


        

Answer 1

View -> Tool Windows -> Build.

There is small "ab" button on the left panel.

All gradle logs for current build are there.

EDIT: There is new icon from AndroidStudio 3.3