Update examples.md (#588)

Extend gradle notes.

examples.md

@@ -137,6 +137,8 @@ We cache the elements of the Cabal store separately, as the entirety of `~/.caba
 
 ## Java - Gradle
 
+>Note: Ensure no Gradle daemons are running anymore when your workflow completes. Creating the cache package might fail due to locks being held by Gradle. Refer to the [Gradle Daemon documentation](https://docs.gradle.org/current/userguide/gradle_daemon.html) on how to disable or stop the Gradle Daemons.
+
 ```yaml
 - uses: actions/cache@v2
   with: