Gradle clean fails because of lint & timber
<p>Using Android Studio 1.5.1 on Windows 7, and gradle 2.8 or 2.10, I got the following error when trying to run a gradle clean (only when using Timber):</p>

<pre><code>gradle clean
Incremental java compilation is an incubating feature.                           
WARNING [Project: :app] To shrink resources you must also enable ProGuard         
:clean                                                                               
:app:clean FAILED          

FAILURE: Build failed with an exception.

* What went wrong:
Execution failed for task ':app:clean'.
&gt; Unable to delete file: C:\blabla\app\build\intermediates\exploded-aar\com.jakewharton.timber\timber\4.1.0\jars\lint.jar

* Try:         
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED
</code></pre>

<p>Found this:<br>
<a href="https://code.google.com/p/android/issues/detail?id=190812" rel="nofollow noreferrer">https://code.google.com/p/android/issues/detail?id=190812</a><br>
and that:<br>
<a href="http://bugs.java.com/bugdatabase/view_bug.do?bug_id=5041014" rel="nofollow noreferrer">http://bugs.java.com/bugdatabase/view_bug.do?bug_id=5041014</a><br>
But for Android Studio &amp; gradle, we have no control on the compilation  (so no control over the URLClassLoader calls).</p>