-import static com.google.common.base.Preconditions.checkNotNull;
-import static com.google.common.base.Preconditions.checkState;
+import javax.net.ssl.KeyManagerFactory;
+import javax.net.ssl.SSLContext;
+
+import org.opendaylight.controller.config.stat.ConfigProvider;
+import org.opendaylight.protocol.util.SSLUtil;
+
+import com.google.common.base.Optional;