-import com.google.common.base.Optional;
-import com.google.common.util.concurrent.CheckedFuture;
-import com.google.common.util.concurrent.Futures;
-import javax.annotation.Nullable;
+import com.google.common.util.concurrent.FluentFuture;
+import java.util.Optional;
+import org.eclipse.jdt.annotation.Nullable;