Gradle build ignores Jetbrains annotations

The easiest solution I have found is to apply org.jetbrains.intellij plugin. Because among other things this plugin "patches compile tasks to instrument code with nullability assertions".

  apply plugin: 'org.jetbrains.intellij'

  intellij {
    instrumentCode = true
    downloadSources = false
  }

Try adding the following to your dependencies. It worked for me.

compile 'org.jetbrains:annotations:13.0'