Android: The import javax.annotation cannot be resolved

I was trying to compile some code from AOSP (Android Open Source Project), and I ran into this error:

The import javax.annotation cannot be resolved

Caused by this code:

import javax.annotation.concurrent.GuardedBy;
import javax.annotation.concurrent.ThreadSafe;

The solution was actually really easy:

1. Go here:
   http://mvnrepository.com/artifact/com.google.code.findbugs/jsr305


2. In the Version column click on the latest version number


3. Click Download ( JAR )


4. Copy the downloaded JAR file to the libs folder in your Android project (create the libs folder if it doesn't already exist).