SONAR suggestion - log exceptions, don't print stack traces

Change-Id: I4814a0662912706df005972d44c48a7db39ecd50
diff --git a/apps/artemis/src/main/java/org/onosproject/artemis/impl/ArtemisConfig.java b/apps/artemis/src/main/java/org/onosproject/artemis/impl/ArtemisConfig.java
index b21c5f6..9d188dd 100644
--- a/apps/artemis/src/main/java/org/onosproject/artemis/impl/ArtemisConfig.java
+++ b/apps/artemis/src/main/java/org/onosproject/artemis/impl/ArtemisConfig.java
@@ -399,7 +399,7 @@
                 try {
                     asnPath.add(path.getInt(i));
                 } catch (JSONException e) {
-                    e.printStackTrace();
+                    log.warn("checkPath", e);
                 }
             }
             // reverse the list to get path starting from origin